[Emc-users] MPG detents

Thanks Kurt. I hope you can get that top sticker back on without any damage. For a low cost device, I expected a much lower parts count. If I had just that PCB made locally it would come out at about $8 It's often disheartening that whatever you might consider making, the Chinese are pumping

Re: [Emc-users] MPG detents

On 03/01/2017 10:16 PM, Gene Heskett wrote: > On Wednesday 01 March 2017 22:31:31 Jon Elson wrote: > > I also have a button that has to be held to enable jogging, > so there will be no jitter (or movement at all) when that > button is not being pressed. That saves me from accidents > when I bump

Re: [Emc-users] MPG detents

On Wednesday 01 March 2017 23:47:59 Kurt Jacobson wrote: > > What sort of bearings if any does the shaft spin in? > > Gene, I don't want to remove the encoder disk as it has to be > positioned just right, but I can just see through the encode slots > what looks to be the outer race and metal

Re: [Emc-users] MPG detents

> > What sort of bearings if any does the shaft spin in? Gene, I don't want to remove the encoder disk as it has to be positioned just right, but I can just see through the encode slots what looks to be the outer race and metal shield of a small ball bearing that the shaft runs in. Pretty

Re: [Emc-users] MPG detents

On Wednesday 01 March 2017 22:31:31 Jon Elson wrote: > On 03/01/2017 12:43 PM, Peter C. Wallace wrote: > > On Wed, 1 Mar 2017, Kirk Wallace wrote: > >> Date: Wed, 1 Mar 2017 09:55:49 -0800 > >> From: Kirk Wallace > >> Reply-To: "Enhanced Machine Controller (EMC)" >

Re: [Emc-users] What is the life of a rotary encoder?

On 03/01/2017 04:40 PM, Steve from Tube Gauge wrote: > > > > > Hi, I have a 1988 First CNC mill that I am considering > retrofitting to accept LinuxCNC. The motors are Fanuc red cap with > 1 ppr. How long will these encoders last? They are all ready > 29 years old. I have other

Re: [Emc-users] MPG detents

On 03/02/17 10:31, Jon Elson wrote: > ---snip--- > I use a 100 "pulse" MPG, and the encoder counter counts all > transitions, and have no problem with jitter, and can count > off the detent clicks by feel. There isn't much jitter on a > 100 pulse/rev encoder, especially with the detent. > I

Re: [Emc-users] MPG detents

On Wednesday 01 March 2017 22:08:50 Kurt Jacobson wrote: > Since there has been a significant amount of discussion about the > cheap MPGs I decided to take mine apart and find out how they work. I > took a bunch of pictures during the disassembly, you can find them > here:

Re: [Emc-users] snagged touch probe on eBay - anybody know how to interface ?

On 03/01/2017 12:44 PM, Ken Strauss wrote: > I recently got a Renishaw MP7 IR probe from eBay. Has there been any further > success with reverse engineering the interface? According to the manual that > came with my probe it is turned on/off by briefly spinning it at 500 rpm to > actuate an

Re: [Emc-users] MPG detents

On 03/01/2017 12:43 PM, Peter C. Wallace wrote: > On Wed, 1 Mar 2017, Kirk Wallace wrote: > >> Date: Wed, 1 Mar 2017 09:55:49 -0800 >> From: Kirk Wallace >> Reply-To: "Enhanced Machine Controller (EMC)" >> >> To:

Re: [Emc-users] MPG detents

On 03/01/2017 12:19 PM, Roland Jollivet wrote: > I presume then, that if you feed a binary increment into > LCNC, instead of a quadrature increment, it would show an > error state? Maybe, depending on how the digital filter works. It might just ignore all illegal state transitions, and

Re: [Emc-users] MPG detents

Since there has been a significant amount of discussion about the cheap MPGs I decided to take mine apart and find out how they work. I took a bunch of pictures during the disassembly, you can find them here: https://goo.gl/photos/w8fJaFLzzUsFzfmV7 It turns out that they use a simple flat spring

Re: [Emc-users] more wacky machines using Linuxcnc

On Wednesday 01 March 2017 09:00:50 TJoseph Powderly wrote: > heres some wild kins for ya > http://en.sv-jme.eu/data/upload/2015/01/03_2013_1619_Zivanovic_04.pdf > i was looking at how NX and Catia required the machine's kins to > output gcode > and stumbled on this paper > i laughed out loud

Re: [Emc-users] MPG detents

On Wednesday 01 March 2017 07:42:17 Roland Jollivet wrote: > I had always assumed that machine MPG's generated one state change per > click, but following Gene's discussion, I pulled out my 1988 Fanuc > MPG, and saw that it was also 4-states per click. Obviously, one > 'pulse'/detent > > Does

[Emc-users] OT - Advice on processor board for indexer project.

Greetings list members; With all the talk or ARM vrs AVR vrs all others etc. I have a question for those who might be able to point me towards a workable solution. Back in the early 80's my uncle purchased a HAAS 5C programmable indexer. This is the hardware that basically was the original

Re: [Emc-users] What is the life of a rotary encoder?

On 1 March 2017 at 22:40, Steve from Tube Gauge wrote: > How long will these encoders last? If they are from 1988 then I would expect them to use LEDs rather than filament bulbs, so they ought to last a long time. But then, they have already lasted a long time :-) They are

[Emc-users] What is the life of a rotary encoder?

Hi, I have a 1988 First CNC mill that I am considering retrofitting to accept LinuxCNC. The motors are Fanuc red cap with 1 ppr. How long will these encoders last? They are all ready 29 years old. I have other machines with dying encoders and linear scales and it usually

Re: [Emc-users] Running servo amplifiers in velocity mode vs. torque mode

We found out in Wichita that the Pico drives can't handle a high enough voltage for these servos. So that is why the decision to get the the AMC BE25A20 drives when some became available. The 'E' in the part number is because they will accept encoder input for running in velocity mode, so in this

Re: [Emc-users] stuck on math again

On Wednesday 01 March 2017 05:14:19 Erik Christiansen wrote: > On 01.03.17 03:53, Gene Heskett wrote: > > That will be its minimum jog increment. At .0001 it looks right, > > for inches, but is it, given that scale in inches? > > > > Would .000254 then be correct for a .01mm move? > > $ units -1

Re: [Emc-users] snagged touch probe on eBay - anybody know how to interface ?

I recently got a Renishaw MP7 IR probe from eBay. Has there been any further success with reverse engineering the interface? According to the manual that came with my probe it is turned on/off by briefly spinning it at 500 rpm to actuate an internal centrifugal switch. It uses a standard 9v

Re: [Emc-users] MPG detents

On Wed, 1 Mar 2017, Kirk Wallace wrote: > Date: Wed, 1 Mar 2017 09:55:49 -0800 > From: Kirk Wallace > Reply-To: "Enhanced Machine Controller (EMC)" > > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] MPG detents >

Re: [Emc-users] MPG detents

On 1 March 2017 at 19:55, Kirk Wallace wrote: > On 03/01/2017 04:42 AM, Roland Jollivet wrote: > > I had always assumed that machine MPG's generated one state change per > > click, but following Gene's discussion, I pulled out my 1988 Fanuc MPG, > and > > saw that it

Re: [Emc-users] PWM vs. analog input servo amplifiers

On 03/01/2017 07:58 AM, dragon wrote: > What are the advantages and disadvantages of using PWM input vs. analog > input servo amplifiers? Simpler, no DAC on the control, no analog input circuitry on the servo amp. No drift when the servo amp is enabled but the LinuxCNC positioning loop is

Re: [Emc-users] Problem with genserkins

2017-02-25 23:46 GMT+02:00 Charles Steinkuehler: > Is anyone else doing 5-axis machining with genserkins? > Not exactly machining... but I'm building a 3D printed stepper driven 6-axis robot arm. So I hope that I'm going to need genserkins soon. The AB behavior you describe (if I get it

Re: [Emc-users] Running servo amplifiers in velocity mode vs. torque mode

On 03/01/2017 07:46 AM, dragon wrote: > I have a project coming up soon that involves a retrofit of a Cel-Con > HMC. The owner has a bunch of AMC BE25A20 drives to use on it. The servo > motors are Fanuc red caps and we have some of Pico Systems' converters > that give us the hall and encoder

Re: [Emc-users] MPG detents

On 03/01/2017 06:42 AM, Roland Jollivet wrote: > I had always assumed that machine MPG's generated one state change per > click, but following Gene's discussion, I pulled out my 1988 Fanuc MPG, and > saw that it was also 4-states per click. Obviously, one 'pulse'/detent > > Does anyone know the

Re: [Emc-users] MPG detents

On 03/01/2017 04:42 AM, Roland Jollivet wrote: > I had always assumed that machine MPG's generated one state change per > click, but following Gene's discussion, I pulled out my 1988 Fanuc MPG, and > saw that it was also 4-states per click. Obviously, one 'pulse'/detent > > Does anyone know the

Re: [Emc-users] Problem with genserkins

The kinematics in the control have very little or nothing to do with the code interpretation. It is only used to tie the machine components together with the control. The kinematics in the post processor (CAM System) have very little or nothing to do with the control nor the kinematics in the

Re: [Emc-users] Running servo amplifiers in velocity mode vs. torque mode

Ah... so in this case, the amplifier itself would do the inner velocity loop. The outer position loop is all that is expected from LinunxCNC then. On 03/01/2017 11:24 AM, Nicklas Karlsson wrote: > On Wed, 1 Mar 2017 07:46:24 -0600 > dragon wrote: > >> I have a project

Re: [Emc-users] Running servo amplifiers in velocity mode vs. torque mode

On Wed, 1 Mar 2017 07:46:24 -0600 dragon wrote: > I have a project coming up soon that involves a retrofit of a Cel-Con > HMC. The owner has a bunch of AMC BE25A20 drives to use on it. The servo > motors are Fanuc red caps and we have some of Pico Systems' converters > that

Re: [Emc-users] PWM vs. analog input servo amplifiers

> What are the advantages and disadvantages of using PWM input vs. analog > input servo amplifiers? Electrical noise. It is usually possible to generate and sample flanks width the accuracy of the clock. -- Check out

Re: [Emc-users] MPG detents

I've learned to use the spinny knob on the BP Discovery 308 but at first missed the detent... JT On 3/1/2017 10:57 AM, Roland Jollivet wrote: > I thought that if 100 detents and 1tick/detent was all that was needed, > then it would be simple to make. 400 ticks/rev is still do-able, but >

Re: [Emc-users] MPG detents

Oh, you are planning to MAKE the encoder? You can always salvage one off an old printer or copy machine. I've found encoder wheels with thousands of divisions and the optical sensor to read them. Also you can find good plastic gears and you can make a geared encoder that runs faster then the

Re: [Emc-users] MPG detents

On 03/01/2017 11:31 AM, Chris Albertson wrote: > I think when you design one of these you have freedom to define the > mechanical detents per revolution and the number of encoder "ticks" per > revolution independently. You are arguing for these numbers to always be > the same. But why? Why

[Emc-users] MPG detents

I thought that if 100 detents and 1tick/detent was all that was needed, then it would be simple to make. 400 ticks/rev is still do-able, but anything above that means a purchased encoder, and then the incentive is lost. I think the detent is invaluable where any overshoot will crash the tool.

Re: [Emc-users] MPG detents

I think when you design one of these you have freedom to define the mechanical detents per revolution and the number of encoder "ticks" per revolution independently. You are arguing for these numbers to always be the same. But why? Why not 10 ticks per detent? I think with a jog wheel the

Re: [Emc-users] [was]multiswitch Q's, now encoder

On Wednesday 01 March 2017 04:49:11 andy pugh wrote: > On 1 March 2017 at 04:32, Gene Heskett wrote: > > Are you saying the html docs on the wiki are more up to date? > > The Wiki and the HTML docs are completely separate things. > > The HTML docs get updated every time the

Re: [Emc-users] Running servo amplifiers in velocity mode vs. torque mode

Unfortunately the drives I have played with could not bat switch. But the one torque mode BLDC set up I have worked with was a PITA to tune, until I set up a dual PID loop in Linuxcnc (essentially turning it into a velocity controlled system.) - Original Message - From: "dragon"

Re: [Emc-users] Running servo amplifiers in velocity mode vs. torque mode

Thanks Chris... Yeah, if no one chimes in with some actual experience I might just have to do that experiment. That Cel-Con should be capable of some pretty decent speeds and does have a bit of mass so that should be a good test. On 03/01/2017 09:23 AM, Chris Radek wrote: > On Wed, Mar 01,

Re: [Emc-users] MPG detents

Thanks, got it.. Roland On 1 March 2017 at 17:11, Kurt Jacobson wrote: > There is no "divide by 4", the machine just moves in increments that are > one fourth the jog increment. For example if you have the increment set to > .001 the machine will move .00025 four

Re: [Emc-users] Running servo amplifiers in velocity mode vs. torque mode

On Wed, Mar 01, 2017 at 07:46:24AM -0600, dragon wrote: > better to run the servo amplifiers in velocity mode or torque mode. I I think the benefits of velocity mode are that it better tolerates (still gives smooth motion with) low encoder resolution and low servo cycle update rates, and it's

Re: [Emc-users] MPG detents

There is no "divide by 4", the machine just moves in increments that are one fourth the jog increment. For example if you have the increment set to .001 the machine will move .00025 four times per detent, which does result in 4 times smother moment. Kurt On Wed, Mar 1, 2017 at 10:01 AM, Roland

[Emc-users] MPG detents

On 1 March 2017 at 16:02, John Kasunich wrote: > > > On Wed, Mar 1, 2017, at 07:42 AM, Roland Jollivet wrote: > > I had always assumed that machine MPG's generated one state change per > > click, but following Gene's discussion, I pulled out my 1988 Fanuc MPG, > and > >

Re: [Emc-users] MPG detents

On Wed, Mar 1, 2017, at 07:42 AM, Roland Jollivet wrote: > I had always assumed that machine MPG's generated one state change per > click, but following Gene's discussion, I pulled out my 1988 Fanuc MPG, and > saw that it was also 4-states per click. Obviously, one 'pulse'/detent > > Does

[Emc-users] more wacky machines using Linuxcnc

heres some wild kins for ya http://en.sv-jme.eu/data/upload/2015/01/03_2013_1619_Zivanovic_04.pdf i was looking at how NX and Catia required the machine's kins to output gcode and stumbled on this paper i laughed out loud when i saw the AXIS screen tomp tjtr33

[Emc-users] PWM vs. analog input servo amplifiers

What are the advantages and disadvantages of using PWM input vs. analog input servo amplifiers? Unless I am mistaken, it looks like it is easier to drive the PWM input ones as they can be driven directly off of something like a Mesa 6i24 without the need for the additional analog interface card.

Re: [Emc-users] Problem with genserkins

i think... On 03/01/17 09:16, Charles Steinkuehler wrote: > On 2/28/2017 5:52 PM, andy pugh wrote: >> On 26 February 2017 at 22:46, Charles Steinkuehler >> wrote: >>> The A and B Axis has no >>> dependency on the rotation of the base of the robot arm (joint-0). >>> >>>

[Emc-users] Running servo amplifiers in velocity mode vs. torque mode

I have a project coming up soon that involves a retrofit of a Cel-Con HMC. The owner has a bunch of AMC BE25A20 drives to use on it. The servo motors are Fanuc red caps and we have some of Pico Systems' converters that give us the hall and encoder signals from the motors. I have been doing a

Re: [Emc-users] Problem with genserkins

Maybe I can help a little on this subject. In 5-axis machining the 4th and 5th axes are controlled in coordinated moves with the x, y, and z axes. For both configurations, tilting and rotating spindle or tilting and rotating tables, the CAM program must create the correct GCODE for all the axes

[Emc-users] MPG detents

I had always assumed that machine MPG's generated one state change per click, but following Gene's discussion, I pulled out my 1988 Fanuc MPG, and saw that it was also 4-states per click. Obviously, one 'pulse'/detent Does anyone know the rationale behind this? I assumed one always wants one step

Re: [Emc-users] stuck on math again

On 01.03.17 03:53, Gene Heskett wrote: > That will be its minimum jog increment. At .0001 it looks right, for > inches, but is it, given that scale in inches? > > Would .000254 then be correct for a .01mm move? $ units -1 You have: .01 mm You want: in * 0.00039370079 The *25.4 factor

Re: [Emc-users] Problem with genserkins

On 1 March 2017 at 02:16, Charles Steinkuehler wrote: > > Perhaps a different way of asking my question: > > Given two types of 5-axis machine, one with A and B pivots on the > spindle, and one with A and B pivots on the table, would identical > gcode be expected to

Re: [Emc-users] [was]multiswitch Q's, now encoder

On 1 March 2017 at 04:32, Gene Heskett wrote: > Are you saying the html docs on the wiki are more up to date? The Wiki and the HTML docs are completely separate things. The HTML docs get updated every time the code gets changed, they are 100% up to date. Go to

[Emc-users] stuck on math again

Greetings all; The scale Andy suggested, but it seems like I can't get the right result. pseudo example: 2 mult2's, named & addf'd in sequence, all running in the slow thread. setp mult2x.in0 [JOINT_0]SCALE # is -25685 for an inch setp mult2x.in1 .0001 net jogxmult2x.out

Re: [Emc-users] Tools to plot data from sampler + halsampler

Simplest: Put the data in a big spread sheet, one row per sample. Spread sheets make good data bases if you only have a few thousand rows. You can graph, filter, search and operate on the data interactively. More Sophisticated: "R". https://www.r-project.org/about.html