Re: [Emc-users] Emco lathe conversion to servos..

On 01/24/2017 03:57 PM, Gene Heskett wrote: > On Tuesday 24 January 2017 14:17:46 Andrew wrote: > >> 2017-01-24 19:37 GMT+02:00 sam sokolik : >>> PWM/dir though the bob. (these amc drives instead of +/-10v take >>> pwm/dir) >> Ah, so convenient. We could save a lot on

Re: [Emc-users] Leadshine closed loop steppers

On 01/24/2017 03:54 PM, Greg Bernard wrote: > Seeing the discussion of servo vs. stepper solutions come up once again I > wonder if anyone has had experience with these: >

Re: [Emc-users] nema 24 motors.

On 01/24/2017 02:31 PM, Gene Heskett wrote: > On Tuesday 24 January 2017 12:47:01 Jon Elson wrote: > Note that > stepper motors are rated on holding torque, and they will > not even produce that much when running at low speeds. > Servos draw no current at no load, and can stay cool so they >

Re: [Emc-users] nema 24 motors.

On 01/24/2017 02:23 PM, Gene Heskett wrote: > > Thats the first time in a decade or more that anybody ever talked about > how that works, thanks. > > In the advertising, it reads like salesman-speak. And I always take 2 > steps back when I read that language. Part of my personal spam filter I >

Re: [Emc-users] Emco lathe conversion to servos..

On Tuesday 24 January 2017 19:07:27 Dave Cole wrote: > The other thing you get into with packaged drives like Omron, > Mitsubishi, Yaskawa, Teco, etc is that they are setup > to use their motors with their drives. You typically cannot mix > between brands.Don't bother calling them asking

Re: [Emc-users] nema 24 motors.

On 01/24/2017 01:04 PM, Gene Heskett wrote: > On Tuesday 24 January 2017 09:49:12 Ed wrote: > >> >> RANT MODE ON >> >> Why in this day of cheap encoders, small ebay servo motors, and good >> inexpensive servo drives does any one even use stepper motors? >> >> Dampers, resonance issues, lost steps,

Re: [Emc-users] Emco lathe conversion to servos..

On Tuesday 24 January 2017 17:19:54 andy pugh wrote: > On 24 January 2017 at 21:57, Gene Heskett wrote: > > At $80 on my front deck, this is a 3 phase driver but what sort of > > an encoder is it expecting on the db15 connector? > > Datasheet here: >

Re: [Emc-users] Leadshine closed loop steppers

Greg, I am using hybrid servos for my mill conversion, they work great, so far. They need to be tuned, otherwise they hum and their torque drops quickly. I am getting upwards of 270ipm on Y with 5mm screws and x25 microstepping. Don't have X yet. Can probably go higher still since I have not had

Re: [Emc-users] ECM (Electrochemical Machining)

Hello I have not used ecm myself, i use edm a lot. I've seen ecm machines working on blisks at factories working for engine manufacturers I know about high current discharges, but ecm is different. edm is efficient up to 4"^2 work area at up to 350/400 amperes, ecm can handle much larger areas

Re: [Emc-users] Leadshine closed loop steppers

We also used closed loop leadshine stepper drivers in our project - they are somehow quite noisy (hum) but still need to findout are stepper motors so loud because of stepper drives or the reason are steppers alone. We use it on plasma pipe cutter. https://www.youtube.com/watch?v=DdLqBqbmIEE=21s

Re: [Emc-users] Emco lathe conversion to servos..

Proof concept I said... http://electronicsam.com/images/matsuura/20170124_182226.jpg sam On 01/24/2017 05:26 PM, sam sokolik wrote: > down to .0001 following error. Linuxcnc keeps on amazing me... > > http://electronicsam.com/images/KandT/testing/emco/emcofollong3.png > > sam > > On 01/24/2017

Re: [Emc-users] Leadshine closed loop steppers

Greg, We have these motors/drives in a 4-axis CNC grinder that works exceptionally well for us. They have been very trouble free since the time we plumbed low pressure air into the motors in order to prevent moisture build-up in their wet environment. In service for over 3 years now. We

Re: [Emc-users] Emco lathe conversion to servos..

The other thing you get into with packaged drives like Omron, Mitsubishi, Yaskawa, Teco, etc is that they are setup to use their motors with their drives. You typically cannot mix between brands.Don't bother calling them asking them how to interface brand B motors with Brand A drives...

Re: [Emc-users] Emco lathe conversion to servos..

down to .0001 following error. Linuxcnc keeps on amazing me... http://electronicsam.com/images/KandT/testing/emco/emcofollong3.png sam On 01/24/2017 04:19 PM, andy pugh wrote: > On 24 January 2017 at 21:57, Gene Heskett wrote: >> At $80 on my front deck, this is a 3

[Emc-users] ECM (Electrochemical Machining)

Dear all, I did follow the interesting discussion about retrofitting EDM machines closely . Is there anybody out there having experience with retrofitting of ECM machines (Electrochemical Maching) ? This processing technology does seem to be alot less common compared to EDM, some basics of

[Emc-users] Leadshine closed loop steppers

Seeing the discussion of servo vs. stepper solutions come up once again I wonder if anyone has had experience with these:

Re: [Emc-users] Emco lathe conversion to servos..

On 24 January 2017 at 21:57, Gene Heskett wrote: > At $80 on my front deck, this is a 3 phase driver but what sort of an > encoder is it expecting on the db15 connector? Datasheet here: http://www.applied-motion.com/products/servo-drives/sv7-s-re -- atp "A motorcycle is

Re: [Emc-users] Emco lathe conversion to servos..

On 24 January 2017 at 19:43, Mark Johnsen wrote: > I haven't used them, no affiliation w/ any of these, but the dmm guys also > have a lower cost servo i just saw, DYN2 AC Servo Drive is step and > direction and analog input... Dyn2 from DMM is 0-5V + Dir in analogue mode,

Re: [Emc-users] Emco lathe conversion to servos..

On Tuesday 24 January 2017 14:17:46 Andrew wrote: > 2017-01-24 19:37 GMT+02:00 sam sokolik : > > PWM/dir though the bob. (these amc drives instead of +/-10v take > > pwm/dir) > > Ah, so convenient. We could save a lot on 7i77's if all servo drives > were like this ) > >

Re: [Emc-users] nema 24 motors.

On Tuesday 24 January 2017 12:47:01 Jon Elson wrote: > On 01/24/2017 10:03 AM, dan...@austin.rr.com wrote: > > Don't servos need a lot of reduction to get the torque up? > > Gearboxes always bring backlash into the system. Low backlash boxes > > are lots of $$$. > > Toothed belt drives don't

Re: [Emc-users] Emco lathe conversion to servos..

On Tuesday 24 January 2017 12:37:56 sam sokolik wrote: > PWM/dir though the bob. (these amc drives instead of +/-10v take > pwm/dir) > > sam Neat and that can be done with the pwmgens in a 7i90. Thanks Sam. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty:

Re: [Emc-users] nema 24 motors.

On Tuesday 24 January 2017 12:37:19 Jon Elson wrote: > On 01/23/2017 11:45 PM, Gene Heskett wrote: > > Greetings all; > > > > I see some "Nema 24" motors at quite reasonable prices showing up on > > fleabay, in fairly high torque ratings, so I bought one 10 days > > back, since I need a stronger

Re: [Emc-users] nema 24 motors.

On Tuesday 24 January 2017 12:37:19 Jon Elson wrote: > On 01/23/2017 11:45 PM, Gene Heskett wrote: > > Greetings all; > > > > I see some "Nema 24" motors at quite reasonable prices showing up on > > fleabay, in fairly high torque ratings, so I bought one 10 days > > back, since I need a stronger

Re: [Emc-users] nema 24 motors.

On Tuesday 24 January 2017 11:03:49 andy pugh wrote: > On 24 January 2017 at 15:51, dragon wrote: > > After having worked with both, I knew that I wouldn't be happy with > > a stepper system even for my little home machines. > > Do you think my Z-servo is big enough? >

Re: [Emc-users] Emco lathe conversion to servos..

This isn't a step/dir drive. Maybe my great drawing ability will help.. http://electronicsam.com/images/matsuura/20170124_140142.jpg This is a conventional servo setup with linuxcnc closing the pid loop. sam On 1/24/2017 1:43 PM, Mark Johnsen wrote: > Actually, there are a lot of servo's like

Re: [Emc-users] nema 24 motors.

On Tuesday 24 January 2017 10:48:46 Todd Zuercher wrote: > - Original Message - > > > From: "Ed" > > To: emc-users@lists.sourceforge.net > > Sent: Tuesday, January 24, 2017 9:49:12 AM > > Subject: Re: [Emc-users] nema 24 motors. > > > > On 01/23/2017 11:45 PM, Gene

Re: [Emc-users] Emco lathe conversion to servos..

On Tuesday 24 January 2017 10:41:51 sam sokolik wrote: > As Ed just mentioned in another thread.. Why oh why use steppers ;) > (although we have a few stepper machines and haven't had any real > issues with them) > > anyhoo... > > we have a couple compact 5 cnc (integrated cnc control) that are

Re: [Emc-users] Emco lathe conversion to servos..

I actually have a 7i77 but couldn't bring my self to use it on this project. It is way overkill. I basically didn't need that much i/o, encoder counters and analog outs 1 5i25 has 34 i/o. I am probably only going to use around 19. (give or take). The 7i77 is still very inexpensive

[Emc-users] Emco lathe conversion to servos..

Actually, there are a lot of servo's like this (w/ step and direction). But, cost comparison is the issue. Omron and Panasonic servo's only accept step and direction (the ones I looked at) and you can probably get them off ebay for a decent price. I had once used Omron and was actually

Re: [Emc-users] Emco lathe conversion to servos..

2017-01-24 19:37 GMT+02:00 sam sokolik : > PWM/dir though the bob. (these amc drives instead of +/-10v take pwm/dir) > Ah, so convenient. We could save a lot on 7i77's if all servo drives were like this ) Andrew

Re: [Emc-users] nema 24 motors.

On Tuesday 24 January 2017 09:49:12 Ed wrote: > On 01/23/2017 11:45 PM, Gene Heskett wrote: > > Greetings all; > > > > I see some "Nema 24" motors at quite reasonable prices showing up on > > fleabay, > > SNIP > > > Now, I don't believe this is going to help with the resonance stalls > > I am

Re: [Emc-users] Emco lathe conversion to servos..

It is basically a voltage mode amplifier.. On 1/24/2017 11:37 AM, sam sokolik wrote: > PWM/dir though the bob. (these amc drives instead of +/-10v take pwm/dir) > > sam > > On 1/24/2017 11:08 AM, Mark Johnsen wrote: >> Linuxcnc -> mesa 5i25 pwm -> Cheap Bob -> AMC drive -> Servo -> Encoder >>

Re: [Emc-users] nema 24 motors.

On 01/24/2017 10:03 AM, dan...@austin.rr.com wrote: > Don't servos need a lot of reduction to get the torque up? Gearboxes always > bring backlash into the system. Low backlash boxes are lots of $$$. > Toothed belt drives don't add backlash, until the belts are badly worn. (On a hobby system,

Re: [Emc-users] nema 24 motors.

On 01/23/2017 11:45 PM, Gene Heskett wrote: > Greetings all; > > I see some "Nema 24" motors at quite reasonable prices showing up on > fleabay, in fairly high torque ratings, so I bought one 10 days back, > since I need a stronger one, with perhaps a damper on it on my x axis. I > bought the 8

Re: [Emc-users] Emco lathe conversion to servos..

PWM/dir though the bob. (these amc drives instead of +/-10v take pwm/dir) sam On 1/24/2017 11:08 AM, Mark Johnsen wrote: > Linuxcnc -> mesa 5i25 pwm -> Cheap Bob -> AMC drive -> Servo -> Encoder > -> mesa 5i25 encoder counter -> Linuxcnc > > I guess you're sending Step and Direction to the AMC

[Emc-users] Emco lathe conversion to servos..

Linuxcnc -> mesa 5i25 pwm -> Cheap Bob -> AMC drive -> Servo -> Encoder -> mesa 5i25 encoder counter -> Linuxcnc I guess you're sending Step and Direction to the AMC Drive from the Cheap BOB? Not a +-10Vdc signal? Mark

Re: [Emc-users] Emco lathe conversion to servos..

Yes - Here is a screen shot while I was tuning.. http://electronicsam.com/images/KandT/testing/emco/emcofollowng2.png sam On 1/24/2017 10:29 AM, Andrew wrote: > 24 січ. 2017 р. 5:44 пп "sam sokolik": > > > and after a bit of tuning we got the following error down to .0002 with > a top speed of

Re: [Emc-users] nema 24 motors.

On 24 January 2017 at 16:19, dragon wrote: > Is your Z ballscrew floating on the far end? It was at that point of the construction, it isn't now: https://goo.gl/photos/jaYvGDbYH51oLJS28 -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for

Re: [Emc-users] Emco lathe conversion to servos..

24 січ. 2017 р. 5:44 пп "sam sokolik": and after a bit of tuning we got the following error down to .0002 with a top speed of 150ipm 30in/s^2. (testing with a lowly 1a 25v archer power supply) Nice machine! Have you used FF1 and FF2? Andrew

Re: [Emc-users] nema 24 motors.

Andy... you must need a lot of reduction for that one :P Is your Z ballscrew floating on the far end? Danny... usually you see a toothed (timing) belt as they have no backlash and are inexpensive. Then you can set whatever reduction you need by changing the ratios. If the servos are big enough or

Re: [Emc-users] nema 24 motors.

On 24 January 2017 at 16:03, wrote: > Don't servos need a lot of reduction to get the torque up? Not always. It depends on leadscrew lead and servo size, > Gearboxes always bring backlash into the system. Low backlash boxes are lots > of $$$. But backlash-free timing

Re: [Emc-users] nema 24 motors.

The servos on my BP knee mill with an Anilam 1100M conversion have timing belt reduction to the ball screw... and so does my CHNC. JT On 1/24/2017 10:03 AM, dan...@austin.rr.com wrote: > Don't servos need a lot of reduction to get the torque up? Gearboxes always > bring backlash into the

Re: [Emc-users] nema 24 motors.

Don't servos need a lot of reduction to get the torque up? Gearboxes always bring backlash into the system. Low backlash boxes are lots of $$$. Danny dragon wrote: > I hate to say it but I'm with Ed on this one. I just paid $32 each for > e661 servos WITH

Re: [Emc-users] nema 24 motors.

On 24 January 2017 at 15:51, dragon wrote: > After having worked with both, I knew that I wouldn't be happy with a > stepper system even for my little home machines. Do you think my Z-servo is big enough? https://goo.gl/photos/TkxsaDgcPFoBqpXV9 (Bought because it was cheap,

Re: [Emc-users] nema 24 motors.

I hate to say it but I'm with Ed on this one. I just paid $32 each for e661 servos WITH encoders to put on my 10x24 lathe and Jet 626 mill. Grab a free thrown out PC and get rid of the noise problems from that SPI bus on the rPi. Analog input drives can be had on ebay for $35, especially if you

Re: [Emc-users] nema 24 motors.

I see all the concern about resonance stalls with steppers. When I switched to Gecko 250 drivers I stopped having these problems. I see 60 ipm with no problems on direct drive and 5 tpi ball screws. They were a little more expensive but a lot less trouble. I can't remember the stated

Re: [Emc-users] nema 24 motors.

- Original Message - > From: "Ed" > To: emc-users@lists.sourceforge.net > Sent: Tuesday, January 24, 2017 9:49:12 AM > Subject: Re: [Emc-users] nema 24 motors. > > On 01/23/2017 11:45 PM, Gene Heskett wrote: > > Greetings all; > > > > I see some "Nema 24" motors at quite

[Emc-users] Emco lathe conversion to servos..

As Ed just mentioned in another thread.. Why oh why use steppers ;) (although we have a few stepper machines and haven't had any real issues with them) anyhoo... we have a couple compact 5 cnc (integrated cnc control) that are dead. The original steppers are non-hybrid 72 steps per rev.

Re: [Emc-users] nema 24 motors.

On 01/23/2017 11:45 PM, Gene Heskett wrote: > Greetings all; > > I see some "Nema 24" motors at quite reasonable prices showing up on > fleabay, SNIP > Now, I don't believe this is going to help with the resonance stalls I am > getting at about 30 ipm, so I'm thinking of building a viscous damper

Re: [Emc-users] nema 24 motors.

On Tuesday 24 January 2017 02:10:53 Danny Miller wrote: > What drive and system voltage are you using here? An M542T for x drive, and a DM860 for Z drive, with an 8 wire 230 oz motor for x, 20 tooth pulley to 40 tooth on the x drive, which is a probably too small ball screw. Z drive is a nema