Anyone use servo motors /drivers

[John11668]

Anyone used this type of kit?
https://www.ebay.co.uk/itm/HSS86-Hybrid-Servo-Driver-NEMA34-Closed-Loop-Stepper-Servo-Motor-8N-M-Set-New/184329463093?epid=11034984002&hash=item2aeae46535:g:nHAAAOSwLg1e52Tf

What is involved ?
Will Mach 3 drive it ?
Are there significant benefits ?

[JAZZCNC]

Yes I've fitted lots of them and they are now the only system of this type I fit, but they are not servos, they are a Closed-loop stepper system.
That basically means they are just a stepper motor with an encoder on the back, the drive then tracks the encoder to make sure it moved the command distance(pulses). They come in two basic types with 2 phase or 3 phase motors, the latter being the better option as they are smoother and more powerful on a size for size basis.

Real servos work very similar in regards to checking position but work very differently in how they drive the motor and are much more powerful with advanced features. They are also more complicated to set up and tune. Not something I'd recommend to a new user

[John11668]

Maybe leave it for the next project then.

[JAZZCNC]

Maybe leave it for the next project then.

Why leave for the next project.? The closed-loop stepper system is much better than a standard stepper system so if you haven't bought motors, drives, etc already then go for these. They are no more difficult to set up and use than ordinary stepper system and give a great performance with some peace of mind your not losing steps.

[m_c]

I think Jazz maybe wasn't quite clear enough with mentioning that it's full servo systems that he wouldn't recommend for a complete beginner (I wouldn't either, unless they were the most suitable option).

Closed loop steppers aren't really any harder to setup than normal steppers. The only additional thing over a normal stepper system you have to do, is wire up the encoder, but if you can wire everything else on the machine, that's likely to be a problem.

[Muzzer]

There is a slightly neater solution available but currently only for lower torque applications (1-3Nm).

I have a Leadshine "Integrated Easy Servo" motor, which is a closed loop stepper drive integrated into the motor, along with an encoder. This means you only have to supply the DC power (36V PSU) and the step / dir signals. http://www.leadshine.com/producttypes.aspx?type=products&category=easy-servo-products&producttype=integrated-easy-servo-motors

As is the Chinese way, there are remarkably similar products available elsewhere, such as JMC https://jmcdriver.com/products.php?cid=248&id=118

The Leadshine works flawlessly and I suspect the JMC is also likely to be good. They only offer models up to 2Nm, although being closed loop, there's less need to overdesign as you would for an open loop system to avoid missing steps.

JAZZ likes Lichuan, who also do a version, this time in 3Nm. https://www.aliexpress.com/store/group/Integrated-Nema23/1907567_512214961.html?spm=2114.12010612.0.0.48285 c47z2vZCV

You can fine tune these with supplied software but mine seemed to be fine without the need. It's probably only if you have an unusual setup eg with large moment of inertia that you'd need to get involved with that but it allows you to change stuff like the number of steps before the drive reports out of position error.

[John11668]

hi guys and thanks for your responses .
All of these appeal but only for my next project because I am already committed on my first one.
http://www.mycncuk.com/threads/13746-Compound-table-conversion-of-an-old-Deckel-mill
Not sure yet how to calculate power requirements so maybe 2Nm would be adequate ?? I guess it involves table inertia on the one hand and maybe mitigated by reduced motor acceleration, as well of course as the cutting forces which of course will be dependent on materials , cutting speeds , etc, etc , etc. maybe have to hunt out my college notes from 50 years ago.
Is there a simpler accepted way??

One advantage of some of those shown might be simpler wiring connections at the motor end cos the the basic motor with 8 wires hanging out of the back is hardly easy to connect in a tidy manner.
I have aero plugs at my panel end of my current project , but the motor end does not look good.

[dazp1976]

hi guys and thanks for your responses .
All of these appeal but only for my next project because I am already committed on my first one.
http://www.mycncuk.com/threads/13746-Compound-table-conversion-of-an-old-Deckel-mill
Not sure yet how to calculate power requirements so maybe 2Nm would be adequate ?? I guess it involves table inertia on the one hand and maybe mitigated by reduced motor acceleration, as well of course as the cutting forces which of course will be dependent on materials , cutting speeds , etc, etc , etc. maybe have to hunt out my college notes from 50 years ago.
Is there a simpler accepted way??

One advantage of some of those shown might be simpler wiring connections at the motor end cos the the basic motor with 8 wires hanging out of the back is hardly easy to connect in a tidy manner.
I have aero plugs at my panel end of my current project , but the motor end does not look good.

The whole compound table is 60kg in weight which is not far off a G0704/ PM25/ AMAT25 x,y table.
These machines are usually kitted up with between 425 & 570 oz/in (3 to 4nm) nema24 steppers at the lowest inductance possible.
Food for thought.

[dazp1976]

If I do it again It'll likely be:
https://www.omc-stepperonline.com/closed-loop-stepper-motor/e-series-nema-23-closed-loop-stepper-motor-4-0-nm-566-56oz-in-encoder-1000cpr.html?mfp=161-motor-nema-size%5BNema%2024%2CNema%2034%5D&sort=p.price&order=ASC
&
https://www.omc-stepperonline.com/closed-loop-stepper-motor/nema-34-closed-loop-stepper-motor-46nm-65154ozin-encoder-1000cpr?mfp=161-motor-nema-size%5BNema%2024%2CNema%2034%5D&sort=p.price&order=ASC
Or
https://www.omc-stepperonline.com/closed-loop-stepper-motor/nema-34-closed-loop-stepper-motor-825nm-116853ozin-encoder-1000cpr?mfp=161-motor-nema-size%5BNema%2024%2CNema%2034%5D&sort=p.price&order=ASC
Driving off:
https://www.omc-stepperonline.com/closed-loop-stepper-driver/y-series-closed-loop-stepper-driver-0-8-5a-20-80vac-30-110vdc-for-nema-34-stepper-motor.html
All powered from something like this:
https://www.automationtechnologiesinc.com/products-page/torroidal-power-supplies/unregulated-1440w-72vdc20a-120vac-or-230vac/
Leaves options open for future upgrades such as stepper ran TC carousel.
Can always use step downs to drop voltage for smaller motors.
Oh and something like this for running the spindle:
https://www.aliexpress.com/item/33053230509.html?spm=a2g0o.productlist.0.0.72b247c a2a2CTP&algo_pvid=e405e7ff-a3e7-4599-ac78-6e63be0874e5&algo_expid=e405e7ff-a3e7-4599-ac78-6e63be0874e5-27&btsid=0b0a050115924974433422583e942c&ws_ab_test=searchweb0_0,searchweb201602_,searchweb 201603_