Re: [Emc-users] off topic: cura profile for BIQU BX 3d printer

On 7/9/21 2:37 PM, Ralph Stirling wrote: Did you get any of the options for that SV01? I bought the SV01 from Amazon for $224 including two day shipping. It's bare bones.  I would have liked the silent stepper motherboard upgrade but it wasn't offered at Amazon.  If I need to replace the mo

Re: [Emc-users] off topic: cura profile for BIQU BX 3d printer

If you have a standard off the shelf FFF/FDM or SLA/DLP/mSLA printer then you are pretty much stuck with the limited slicer options. Most phone home or for  SLA/DLP/mSLA only output a proprietary format. I have a printer controller running nanDLP that we have isolated on the network. The softw

Re: [Emc-users] off topic: cura profile for BIQU BX 3d printer

Did you get any of the options for that SV01? I really appreciate your reviews. -- Ralph On Jul 9, 2021 11:14 AM, Bruce Layne wrote: CAUTION: This email originated from outside the Walla Walla University email system. On 7/9/21 9:05 AM, Gene Heskett wrote: > I also priced the pro version of

Re: [Emc-users] off topic: cura profile for BIQU BX 3d printer

On Friday 09 July 2021 04:18:05 andy pugh wrote: > On Fri, 9 Jul 2021 at 04:42, Gene Heskett wrote: > > I think this is a bug, but where do I report it? > > https://github.com/Ultimaker/Cura/issues Thanks Andy, I did find some helpfull stuffs there. but not a good answer, only work-a-rounds. N

Re: [Emc-users] off topic: cura profile for BIQU BX 3d printer

On 7/9/21 9:05 AM, Gene Heskett wrote: I also priced the pro version of cura, but $750 for a years seat at that table is a bit steep. I am not a happy camper this morning. SLICERS: A month ago, I decided that the Simplify3D slicing software that I bought with lifetime free upgrades, that s

Re: [Emc-users] off topic: cura profile for BIQU BX 3d printer

On Thursday 08 July 2021 23:39:30 Gene Heskett wrote: > On Thursday 08 July 2021 21:27:17 Chris Albertson wrote: > > cura -> preferences -> profiles -> import > > Then select your file. > > It won't let me import it because it does, if a profile exists, it > clashes with that profiles "base" file.

Re: [Emc-users] off topic: cura profile for BIQU BX 3d printer

On Fri, 9 Jul 2021 at 04:42, Gene Heskett wrote: > I think this is a bug, but where do I report it? https://github.com/Ultimaker/Cura/issues -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." —

Re: [Emc-users] off topic: cura profile for BIQU BX 3d printer

On Thursday 08 July 2021 21:27:17 Chris Albertson wrote: > cura -> preferences -> profiles -> import > Then select your file. It won't let me import it because it does, if a profile exists, it clashes with that profiles "base" file. exit cura, and clean out all previous cfg files, leaving nothi

Re: [Emc-users] off topic: cura profile for BIQU BX 3d printer

cura -> preferences -> profiles -> import Then select your file. I don't know if simply moving the file works. If you need to know here it is kept you can always search for the filename after you import it. but I think it is inside something like $HOME/cura/appdata/... On Thu, Jul 8, 2021 at 6:0

[Emc-users] off topic: cura profile for BIQU BX 3d printer

Greetings all; I have the u-sd card that came with a new BIQU BX printer, one of the high priced things that has ALL the bells and whistles. Unforch, cura only know about the B1, which has a different printhead, and the extrusion rate is several times too high, and the printer won't let me chang

Re: [Emc-users] (off topic) nema17 angle gearbox

On 2/26/21 12:19 PM, andy pugh wrote: On Fri, 26 Feb 2021 at 18:49, R C wrote: this is off topic, but was wondering if anyone knows of any 90 degree angle nema17 gearboxes (preferably 1:1) To be unhellpful: I don't know of any but most of the NEMA17 that I see are shorter than they are wide

Re: [Emc-users] (off topic) nema17 angle gearbox

Den 2021-02-26 kl. 19:46, skrev R C: Hello, this is off topic,  but was wondering if anyone knows of any 90 degree angle nema17 gearboxes (preferably 1:1) You rally need a 1:1  gearbox? ___ Emc-users mailing list Emc-users@lists.sourceforge.net

Re: [Emc-users] (off topic) nema17 angle gearbox

On Fri, 26 Feb 2021 at 18:49, R C wrote: > this is off topic, but was wondering if anyone knows of any 90 degree > angle nema17 gearboxes (preferably 1:1) To be unhellpful: I don't know of any but most of the NEMA17 that I see are shorter than they are wide, so I am not sure what the applicatio

[Emc-users] (off topic) nema17 angle gearbox

Hello, this is off topic,  but was wondering if anyone knows of any 90 degree angle nema17 gearboxes (preferably 1:1) that take a 1/4" input shaft, and of course a nema17 stepper motor thanks, Ron ___ Emc-users mailing list Emc-users@lists.

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On Wednesday 15 July 2020 08:29:55 Gene Heskett wrote: > On Wednesday 15 July 2020 07:40:50 Gene Heskett wrote: > > On Wednesday 15 July 2020 00:58:43 Gregg Eshelman via Emc-users wrote: > > > There are sine wave controllers that do various smoothing things > > > to run steppers smooth and silent

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On Wednesday 15 July 2020 07:40:50 Gene Heskett wrote: > On Wednesday 15 July 2020 00:58:43 Gregg Eshelman via Emc-users wrote: > > There are sine wave controllers that do various smoothing things to > > run steppers smooth and silent. Trinamic calls it Spread Cycle and > > Stealth Chop. https://w

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On Wednesday 15 July 2020 00:58:43 Gregg Eshelman via Emc-users wrote: > There are sine wave controllers that do various smoothing things to > run steppers smooth and silent. Trinamic calls it Spread Cycle and > Stealth Chop. https://www.youtube.com/watch?v=Q0sJlGh9WNY On Tuesday, > July 14, 2020,

Re: [Emc-users] off topic: pwm with a stepper driver/motor

There are sine wave controllers that do various smoothing things to run steppers smooth and silent. Trinamic calls it Spread Cycle and Stealth Chop. https://www.youtube.com/watch?v=Q0sJlGh9WNY On Tuesday, July 14, 2020, 11:18:22 AM MDT, Todd Zuercher wrote: If you can hear it, it isn'

Re: [Emc-users] off topic: pwm with a stepper driver/motor

This person makes basically comedy videos with one totally impossible robot after another. The "robots" are props. He does not try to be serious. I suspect the kid is the actor and others make the props. The background sets are built and the lighting is certainly not what is found in a home g

Re: [Emc-users] off topic: pwm with a stepper driver/motor

Hi Chris, On 7/14/20 12:10 PM, Chris Albertson wrote: On Tue, Jul 14, 2020 at 10:50 AM John Dammeyer wrote: https://youtu.be/tlMTksuOuZQ Were you using LinuxCNC for this? Or did you write your own control software? This was done with Linux CNC. However, The purpose of me owning a mill

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On 7/14/20 11:48 AM, John Dammeyer wrote: -Original Message- From: Chris Albertson [mailto:albertson.ch...@gmail.com] Sent: July-14-20 2:49 AM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] off topic: pwm with a stepper driver/motor Gene is correct when he wrote the

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On 07/14/2020 01:51 PM, andy pugh wrote: On Fri, 10 Jul 2020 at 10:34, andy pugh wrote: I don't see why there is any limit to the possible reduction of a belt drive, if idlers are added to increase the wrap. And here is an example: https://youtu.be/7zBrbdU_y0s OH MY! Some people REALLY hav

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On Fri, 10 Jul 2020 at 10:34, andy pugh wrote: > I don't see why there is any limit to the possible reduction of a belt > drive, if idlers are added to increase the wrap. And here is an example: https://youtu.be/7zBrbdU_y0s -- atp "A motorcycle is a bicycle with a pandemonium attachment and i

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On Tue, Jul 14, 2020 at 10:50 AM John Dammeyer wrote: > > > https://youtu.be/tlMTksuOuZQ > > > Were you using LinuxCNC for this? Or did you write your own control > software? > This was done with Linux CNC. However, The purpose of me owning a mill is for robotics. I have not yet figured how

Re: [Emc-users] off topic: pwm with a stepper driver/motor

> -Original Message- > From: Chris Albertson [mailto:albertson.ch...@gmail.com] > Sent: July-14-20 2:49 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] off topic: pwm with a stepper driver/motor > > Gene is correct when he wrote the precis

Re: [Emc-users] off topic: pwm with a stepper driver/motor

R C Sent: Tuesday, July 14, 2020 9:39 AM To: emc-users@lists.sourceforge.net Subject: Re: [Emc-users] off topic: pwm with a stepper driver/motor [EXTERNAL EMAIL] Be sure links are safe. Hi Chris, for the go to part I am not "too worried"about that possibly not being too smooth,

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On 07/14/2020 04:49 AM, Chris Albertson wrote: But what I wanted to add is that when you read the speed vs. torque curve it is for FULL steps. The amount of holding torque is reduced with microsteps. It makes sense too, full steps use full current that is switched between coils just 100% on or

Re: [Emc-users] off topic: pwm with a stepper driver/motor

Hi Chris, for the go to part I am not "too worried"about that possibly not being too smooth, of course it is the goal to do that, but the point there is to get there. The equatorial tracking indeed needs to be as smooth as possible.  With the hearing I have I think I can run the stepper mot

Re: [Emc-users] off topic: pwm with a stepper driver/motor

Gene is correct when he wrote the precision might be off when micro-stepping. Motors are mechanically built for 1.8 degree steps so that is likely to be accurate but half steps depend on the driver. But what I wanted to add is that when you read the speed vs. torque curve it is for FULL steps. T

Re: [Emc-users] off topic: pwm with a stepper driver/motor

Hello Gene, On 7/14/20 12:49 AM, Gene Heskett wrote: On Monday 13 July 2020 22:44:37 R C wrote: well,  I can calculate what the speed needs to be, also I can actually "observe" it too..  by pointing the  telescope at a star and see how much the deviation is.  I have encoder to check the actual

Re: [Emc-users] off topic: pwm with a stepper driver/motor

Hello Chris, On 7/14/20 12:31 AM, Chris Albertson wrote: On Mon, Jul 13, 2020 at 7:28 PM R C wrote: Interesting, but I already have the motors, and the gears are on their way. What I was really looking for is how to drive the stepper-drivers, he DM542 series ones. Do you have the us

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On Monday 13 July 2020 22:44:37 R C wrote: > well,  I can calculate what the speed needs to be, also I can actually > "observe" it too..  by pointing the  telescope at a star and see how > much the deviation is.  I have encoder to check the actual speed of a > shaft. > > I found some information i

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On Mon, Jul 13, 2020 at 7:28 PM R C wrote: > Interesting, > > > but I already have the motors, and the gears are on their way. What > I was really looking for is how to drive the stepper-drivers, he DM542 > series ones. > Do you have the user manual for the DM542? If not look at the top t

Re: [Emc-users] off topic: pwm with a stepper driver/motor

yup exactly,  actually in a way  so I can point at things that you can't really see but  would need longer exposures for. On 7/13/20 9:28 PM, Chris Albertson wrote: On Mon, Jul 13, 2020 at 8:02 PM Dave Matthews wrote: It may just be my age but wouldn't it be easier to just use a 555 (do they

Re: [Emc-users] off topic: pwm with a stepper driver/motor

yeah that would be easiest,  but I want to do something similar for azimuth and altitude. On 7/13/20 9:00 PM, Dave Matthews wrote: It may just be my age but wouldn't it be easier to just use a 555 (do they still make them) and a knob to tweak the pulse rate to match the star? Add a slew button

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On Mon, Jul 13, 2020 at 8:02 PM Dave Matthews wrote: > It may just be my age but wouldn't it be easier to just use a 555 (do they > still make them) and a knob to tweak the pulse rate to match the star? That would be easy but I think there is some plan to have a "go to" ability where the 'scope

Re: [Emc-users] off topic: pwm with a stepper driver/motor

It may just be my age but wouldn't it be easier to just use a 555 (do they still make them) and a knob to tweak the pulse rate to match the star? Add a slew button to change the speed while the button is pushed and a direction switch to toggle the direction pin on the driver. I guess I don't see

Re: [Emc-users] off topic: pwm with a stepper driver/motor

well,  I can calculate what the speed needs to be, also I can actually "observe" it too..  by pointing the  telescope at a star and see how much the deviation is.  I have encoder to check the actual speed of a shaft. I found some information in a manual/tech-sheet that comes with the drivers,

Re: [Emc-users] off topic: pwm with a stepper driver/motor

A fast control loop that drives each motor at a given speed and a second slower control loop that figures out what that speed should be. The second loop typically uses "PID" even if only in fact the "P" is used. That can be used to drive any number of motors all at their correct speeds. On Mon

Re: [Emc-users] off topic: pwm with a stepper driver/motor

Interesting, but I already have the motors,  and  the gears are on their way.   What I was really looking for is how to drive the stepper-drivers, he DM542 series ones. Ron On 7/13/20 7:53 PM, cogoman via Emc-users wrote: I recently discovered geared stepper motors. http://www.zyltech.

Re: [Emc-users] off topic: pwm with a stepper driver/motor

I recently discovered geared stepper motors. http://www.zyltech.com/nema-17-stepper-motor-geared-planetary-gearbox-1-7-a-3-1-nm-435-ozin/ I've been happy with zyltech in the past.  I bought one of these for evluation, but the specs seem to be great for CNC. Low enough current to work with a st

Re: [Emc-users] off topic: pwm with a stepper driver/motor

. that is easy to do -Original Message- From: Chris Albertson [mailto:albertson.ch...@gmail.com] Sent: Friday, July 10, 2020 10:14 PM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] off topic: pwm with a stepper driver/motor Stepper motors are good for this. A stepper ha

Re: [Emc-users] off topic: pwm with a stepper driver/motor

[mailto:cjv...@gmail.com] Sent: Friday, July 10, 2020 10:05 PM To: emc-users@lists.sourceforge.net Subject: Re: [Emc-users] off topic: pwm with a stepper driver/motor yep.. true.. but it is also knd of what I do for a living... I think it can be done, to build an equatorial platform, and

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On 7/10/20 8:13 PM, Chris Albertson wrote: Stepper motors are good for this. A stepper has the most torque at zero RPM and the torque falls as speed increases while a DC brushed motor has very little power when moving slowly. You need more gearing with the DC motor. that is exactly right, t

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On Friday 10 July 2020 22:26:12 Ken Strauss wrote: > "You need more gearing with the DC motor." Correct and this could be > considered an advantage since a very small DC motor + gearing > (multiple planetary stages) would have sufficient torque to move the > scope. I have no idea if a RPI can keep

Re: [Emc-users] off topic: pwm with a stepper driver/motor

Chris Albertson [mailto:albertson.ch...@gmail.com] > Sent: Friday, July 10, 2020 10:14 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] off topic: pwm with a stepper driver/motor > > Stepper motors are good for this. A stepper has the most torque at zero >

Re: [Emc-users] off topic: pwm with a stepper driver/motor

units? See https://www.teknic.com/ > -Original Message- > From: R C [mailto:cjv...@gmail.com] > Sent: Friday, July 10, 2020 10:05 PM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] off topic: pwm with a stepper driver/motor > > yep.. true.. but it is

Re: [Emc-users] off topic: pwm with a stepper driver/motor

Stepper motors are good for this. A stepper has the most torque at zero RPM and the torque falls as speed increases while a DC brushed motor has very little power when moving slowly. You need more gearing with the DC motor. The problem is you need to generate precise pulses. If the pulse spaci

Re: [Emc-users] off topic: pwm with a stepper driver/motor

rge.net Subject: Re: [Emc-users] off topic: pwm with a stepper driver/motor I don't think anyone did, but I know that's how most do it... But that's just too easy :)I would just like to see if I can do it, killing time On 7/10/20 7:39 PM, Ken Strauss wrote: I haven't

Re: [Emc-users] off topic: pwm with a stepper driver/motor

R C [mailto:cjv...@gmail.com] > Sent: Friday, July 10, 2020 9:43 PM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] off topic: pwm with a stepper driver/motor > > I don't think anyone did, but I know that's how most do it... > > But that's just too

Re: [Emc-users] off topic: pwm with a stepper driver/motor

I don't think anyone did,  but I know that's how most do it... But that's just too easy  :)    I would just like to see if I can do it, killing time On 7/10/20 7:39 PM, Ken Strauss wrote: I haven't been following this closely but has anyone suggested that you use a DC motor with an encoder?

Re: [Emc-users] off topic: pwm with a stepper driver/motor

I haven't been following this closely but has anyone suggested that you use a DC motor with an encoder? With a PID loop and PWM power to the motor you could run the motor continuously. DC motors with integrated encoder and planetary gearbox are readily available for a few dollars. Just a thought

Re: [Emc-users] off topic: pwm with a stepper driver/motor

from what I understand,  worm gears work really well  and because of the reduction, the motor needs to sping at a decent rpm, it doesn't have tospin that slow. I am using steppers, because it is easy to count the steps and then calibrate because of how much you're drifting.While with a regular

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On 7/10/20 1:12 PM, Chris Albertson wrote: On Fri, Jul 10, 2020 at 10:33 AM andy pugh wrote: Sprockets for T2.5 belts are available with 10 teeth, so that would be a 2.3m table for the 300:1. Which is also probably too big. I suppose that the design criterion is that one stepper step should be

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On Fri, 10 Jul 2020 at 20:14, Chris Albertson wrote: > You need to move at 1/2 the resolution otherwise you can see the steps. So > let's say each step would be 1/4 arc-second I was going with one step per thingy, and then assuming microstepping to get sub-thingy :-) I will just mention: https

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On Fri, Jul 10, 2020 at 10:33 AM andy pugh wrote: > > Sprockets for T2.5 belts are available with 10 teeth, so that would be > a 2.3m table for the 300:1. Which is also probably too big. I suppose > that the design criterion is that one stepper step should be less than > the angular resolution of

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On Fri, 10 Jul 2020 at 17:59, Chris Albertson wrote: > There is also a minimum amount number of degrees of contact required with > the small pulley. The pulley must be far enough away so the minimum number > of teeth are engaged. Or you can use idlers to modify the belt shape. This is done very

Re: [Emc-users] off topic: pwm with a stepper driver/motor

Yes in theory one could design a 300:1 belt reduction in one stage. But according to the belt manufacturer, you do need to have a minimum number of belt teeth engaged. I think about 11 teeth. If only 180 degrees of the small pulley is engaged with the belt then the minim pulley size is 22. So t

[Emc-users] off topic: pwm with a stepper driver/motor

I had a friend that had a motorised telescope. It had a DC motor, with a very high reduction ratio. I think one would see fluctuations with a stepper motor. Also, I wouldn't use a belt at all. Drive a smooth roller and use a friction drive against a large disc. This also allows you to manually tur

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On Friday 10 July 2020 05:34:58 andy pugh wrote: > On Fri, 10 Jul 2020 at 02:00, Chris Albertson wrote: > > Belts can go to about 6:1 at best a double belt reduction only goes > > to 36:1 > > I don't see why there is any limit to the possible reduction of a belt > drive, if idlers are added to i

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On Fri, 10 Jul 2020 at 02:00, Chris Albertson wrote: > Belts can go to about 6:1 at best a double belt reduction only goes to 36:1 I don't see why there is any limit to the possible reduction of a belt drive, if idlers are added to increase the wrap. If I was doing this (and this particular appl

Re: [Emc-users] off topic: pwm with a stepper driver/motor

How to generate pulse at the exact rate you need... First make a loop that runs as fast as you can make it run. The first thing it does is "sleep" for a hundred or so microseconds. Then it checks the time of day and to see if it is time yet to do the next pulse. If not it fall to the end of the

Re: [Emc-users] off topic: pwm with a stepper driver/motor

Stepper motors are called that because they move in steps. Usually they have two coils. Both coils are powered when the motor is powered on, and this is what holds the motor in position. Reversing the current to one of these coils will advance the motor to the next step. The direction the motor

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On 7/9/20 6:47 PM, Chris Albertson wrote: OK, got it a "Dob, on a Ea, platform and the platform on an Az, El mount. Yup. Again PWM is "Pisle Width Modulation" Steppers and stepper drivers don't use PWM. They use what we cal "Pulse/Direction" I didn't know that,  I read the product manual

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On Thursday 09 July 2020 20:32:42 Gene Heskett wrote: > > > Steppers aren't pwm driven, so ignore that. But a 48 volt supply > > > is pushing the ratings of a DM542 which is 50 volts max, and you > > > would be wise to adjust it a few volts lower. I have a pair of 7.5 > > > amp 48 volt supplies r

Re: [Emc-users] off topic: pwm with a stepper driver/motor

Gene, Belts are a good idea for the Ax and El axis but in the Eq axis he needs something on the order of 100:1 reduction The time tested traditional method is a synchronous AC moter and a VFD that can do 60 Hz +/- about 5 percent. This axis turns only 1 rev per day but the step need to be less t

Re: [Emc-users] off topic: pwm with a stepper driver/motor

OK, got it a "Dob, on a Ea, platform and the platform on an Az, El mount. Again PWM is "Pisle Width Modulation" Steppers and stepper drivers don't use PWM. They use what we cal "Pulse/Direction" PWM uses a constant square wave rate like that is always between 60 Hz and maybe up to 1,000 Hz. Wh

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On Thursday 09 July 2020 19:05:45 R C wrote: > Hello Gene, > > > To start with the end of your reply,  I actually am a mathematician  > :) > > On 7/9/20 4:24 PM, Gene Heskett wrote: > > On Thursday 09 July 2020 14:23:57 R C wrote: > >> Hello, > >> > >> this is (probably) off topic, been seen that

Re: [Emc-users] off topic: pwm with a stepper driver/motor

I am not using linux cnc,  I am just  'driving'  the stepper drivers with a raspberry pi I figured,  same hardware (drivers, motors),  "Linux CNC" can use it, so thought I'd just ask here about the internals/specifics and how to use it. On 7/9/20 1:44 PM, andy pugh wrote: On Thu, 9 Jul 202

Re: [Emc-users] off topic: pwm with a stepper driver/motor

Hello Gene, To start with the end of your reply,  I actually am a mathematician  :) On 7/9/20 4:24 PM, Gene Heskett wrote: On Thursday 09 July 2020 14:23:57 R C wrote: Hello, this is (probably) off topic, been seen that happen.  If it is please ignore it. I am building a "motorized"  tel

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On 7/9/20 1:44 PM, andy pugh wrote: On Thu, 9 Jul 2020 at 19:26, R C wrote: The stepper motors I use with a stepper driver, those common DM542 ones, the stepper motors themselves are 2A and 1.8 degrees per step. ... As with PWM itself, I am probably just not too familiar with it. Do you me

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On Thursday 09 July 2020 14:23:57 R C wrote: > Hello, > > this is (probably) off topic, been seen that happen.  If it is please > ignore it. > > > I am building a "motorized"  telescope mount (dobsonian) with what is > called an equatorial platform, it has 3 axis which I am going to drive > with s

Re: [Emc-users] off topic: pwm with a stepper driver/motor

there will be worm gears, and those will just gear all the axis/axes down down. On 7/9/20 1:23 PM, Chris Albertson wrote: Telescopes are something I know a little about, What you don't tell us and what matters quite a lot is the mechanical gearing. How are the motors connected to the mount?

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On Thu, Jul 9, 2020 at 12:47 PM andy pugh wrote: > On Thu, 9 Jul 2020 at 19:26, R C wrote: > > > The stepper motors I use with a stepper driver, those common DM542 ones, > > the stepper motors themselves are 2A and 1.8 degrees per step. > ... > > As with PWM itself, I am probably just not too fa

Re: [Emc-users] off topic: pwm with a stepper driver/motor

On Thu, 9 Jul 2020 at 19:26, R C wrote: > The stepper motors I use with a stepper driver, those common DM542 ones, > the stepper motors themselves are 2A and 1.8 degrees per step. ... > As with PWM itself, I am probably just not too familiar with it. Do you mean PWM? Stepper drivers take step a

Re: [Emc-users] off topic: pwm with a stepper driver/motor

Telescopes are something I know a little about, What you don't tell us and what matters quite a lot is the mechanical gearing. How are the motors connected to the mount? If this is an equatorial mount what are there three motors? and why care much about if declination moves smoothing as it is on

[Emc-users] off topic: pwm with a stepper driver/motor

Hello, this is (probably) off topic, been seen that happen.  If it is please ignore it. I am building a "motorized"  telescope mount (dobsonian) with what is called an equatorial platform, it has 3 axis which I am going to drive with stepper motors. The stepper motors I use with a steppe

Re: [Emc-users] off topic repair bldc ring magnet for halls

> I think I need to replace the ring magnet. > > Has anyone here any advice ( besides buy a new 400$ motor ? :-) Rather than rebuild a ring magnet that mirrors the main motor magnet, you might find it easier to install the hall sensors inside the motor, so they sense the actual motor magnets.

Re: [Emc-users] off topic repair bldc ring magnet for halls

On Sat, 7 Dec 2019 at 05:50, Thomas J Powderly wrote: > > I think I need to replace the ring magnet. Does the motor have an encoder? Are you using LinuxCNC? The LinuxCNC "bldc" component can synthesise hall signals for a drive from encoder data. If you are not using LinuxCNC then perhaps you c

Re: [Emc-users] off topic repair bldc ring magnet for halls

Sorry to ask off topic but this group is the most knowledgeable in all things geeky ;-) Please read this using a fixed font so the ascii timing diagram is correct. I am trying to rebuild a damaged bldc motor It had built-in controller, and water damage blew fet traces right off the pcb. The p

Re: [Emc-users] (Off topic) A Question Re: BOBs and Opto-Isolators

On Monday 14 October 2019 13:36:24 John Dammeyer wrote: > > On Sunday 13 October 2019 19:46:55 Kenneth Lerman wrote: > > > Hello All -- especially Gene, > > > > > > I've seen many posts on the lists regarding breakout boards and > > > dealing with issues regarding slow opto-isolators. I have a > >

Re: [Emc-users] (Off topic) A Question Re: BOBs and Opto-Isolators

Oh and the reason for all those opto RJ45 interface modules is because the STMBL drive: http://www.autoartisans.com/mill/STMBL-4.1.jpg uses the top connector for step/dir/enable and fault as RS422 signals. The next RJ45 is for the encoder index, A and B as RS422 signals along with 5V to power th

Re: [Emc-users] (Off topic) A Question Re: BOBs and Opto-Isolators

> On Sunday 13 October 2019 19:46:55 Kenneth Lerman wrote: > > > Hello All -- especially Gene, > > > > I've seen many posts on the lists regarding breakout boards and > > dealing with issues regarding slow opto-isolators. I have a question: > > > > Is anyone using: ISO776x > >

Re: [Emc-users] (Off topic) A Question Re: BOBs and Opto-Isolators

On Monday 14 October 2019 08:14:38 Kenneth Lerman wrote: > They are actually rated from zero Hz (DC) to 100MHz. > Then they have stuff in there that not in the diagrams in the pdf. 'twon't be the first time howto's don't show proprietary stuff :) > Ken > > Kenneth Lerman > 55 Main Street > Newt

Re: [Emc-users] (Off topic) A Question Re: BOBs and Opto-Isolators

They are actually rated from zero Hz (DC) to 100MHz. Ken Kenneth Lerman 55 Main Street Newtown, CT 06470 On Mon, Oct 14, 2019 at 5:27 AM Gene Heskett wrote: > On Sunday 13 October 2019 19:46:55 Kenneth Lerman wrote: > > > Hello All -- especially Gene, > > > > I've seen many posts on the list

Re: [Emc-users] (Off topic) A Question Re: BOBs and Opto-Isolators

On Sunday 13 October 2019 19:46:55 Kenneth Lerman wrote: > Hello All -- especially Gene, > > I've seen many posts on the lists regarding breakout boards and > dealing with issues regarding slow opto-isolators. I have a question: > > Is anyone using: ISO776x >

Re: [Emc-users] (Off topic) A Question Re: BOBs and Opto-Isolators

> Hello All -- especially Gene, > > I've seen many posts on the lists regarding breakout boards and dealing > with issues regarding slow opto-isolators. I have a question: > > Is anyone using: ISO776x > devices? Well, not exactly his one but there

[Emc-users] (Off topic) A Question Re: BOBs and Opto-Isolators

Hello All -- especially Gene, I've seen many posts on the lists regarding breakout boards and dealing with issues regarding slow opto-isolators. I have a question: Is anyone using: ISO776x devices? They are 100 MHz data rate devices, have high isol

Re: [Emc-users] [Off topic] Might interest Gene, radio pirates.

and the movie was great https://en.wikipedia.org/wiki/The_Boat_That_Rocked On 04/25/2019 12:28 AM, andy pugh wrote: https://hackaday.com/2019/04/24/radio-piracy-on-the-high-seas/ tomp ___ Emc-users mailing list Emc-users@lists.sourceforge.net https:

Re: [Emc-users] [Off topic] Might interest Gene, radio pirates.

On Wednesday 24 April 2019 13:28:19 andy pugh wrote: > https://hackaday.com/2019/04/24/radio-piracy-on-the-high-seas/ Chuckle, yes, those were the days. Brought on by the bbc's stiff upper lip about music, which of course just had to be paid for by the listeners. Cheers, Gene Heskett -- "Ther

[Emc-users] [Off topic] Might interest Gene, radio pirates.

https://hackaday.com/2019/04/24/radio-piracy-on-the-high-seas/ -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1916

Re: [Emc-users] [Off topic] Clocks and radios

On Wednesday 22 August 2018 05:20:11 andy pugh wrote: > On Wed, 22 Aug 2018 at 10:13, Bruce Layne wrote: > > As long as ntp.org is available, I won't miss WWVB. > > But around 50 million users of radio-controlled clocks and > wristwatches will. > > It sounds like your clocks didn't synch to radi

Re: [Emc-users] [Off topic] Clocks and radios

On Wed, 22 Aug 2018 at 10:13, Bruce Layne wrote: > > As long as ntp.org is available, I won't miss WWVB. But around 50 million users of radio-controlled clocks and wristwatches will. It sounds like your clocks didn't synch to radio properly, isn't DST mode part of the signal? (I know that WWVB t

Re: [Emc-users] [Off topic] Clocks and radios

As long as ntp.org is available, I won't miss WWVB.  My computers and cell phone automatically keep perfect time.  I can reset the clock on the microwave oven manually. The US Congress, in their arrogance, changed the timing of daylight savings time.  They have excuses, but I really think they

[Emc-users] [Off topic] Clocks and radios

I know that some folk here like clocks, and that others are interested in radio. And some in both. This might be of interest. https://hackaday.com/2018/08/20/what-will-you-do-if-wwvb-goes-silent/ (There is a proposal to stop broadcasting the time signals that radio controlled clocks use) -- atp

Re: [Emc-users] Off topic: wolfrom drive

H2000-AC-SER > VO-ACTUATOR/232535240729?hash=item36242e3019:g:4bAAAOSwXrdZ7vsm > > John > > > > > -Original Message- > > From: Chris Albertson [mailto:albertson.ch...@gmail.com] > > Sent: December-21-17 1:38 PM > > To: Enhanced Machine Controller (EMC) > &g

Re: [Emc-users] Off topic: wolfrom drive

UATOR/232535240729?hash=item36242e3019:g:4bAAAOSwXrdZ7vsm John > -Original Message- > From: Chris Albertson [mailto:albertson.ch...@gmail.com] > Sent: December-21-17 1:38 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Off topic: wolfrom drive > > Bu

Re: [Emc-users] Off topic: wolfrom drive

Buying on eBay means waiting, checking every few days and waiting. But you do eventually find one. Part numbers and specs here: http://www.harmonicdrive.net/_hd/content/documents/hpg-catalog.pdf About 15 second into this he tells you how to read part numbers https://youtu.be/mmOnktzifeg?t=1m33s

Re: [Emc-users] Off topic: wolfrom drive

On 21 December 2017 at 20:34, Gene Heskett wrote: > And the $170 version seems to be guts only, without the internal rack. > Maybe I'm to be considered dumb because I don't know them from long > familiarity with using them, but so is assuming everyone has a pile of > makers catalogues reaching ba

Re: [Emc-users] Off topic: wolfrom drive

On Thursday 21 December 2017 12:39:16 Chris Albertson wrote: > On Thu, Dec 21, 2017 at 2:12 AM, Gene Heskett wrote: > > On Thursday 21 December 2017 04:18:46 Chris Albertson wrote: > > > To make this really work for rotary tables you need a very fine > > > pitch. I have seen these 3D printed in

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