Hybird Servo / Leadshine

[andy_con]

looking at replacing the 25 year old steppers in my cnc with hybrid servo/steppers.I know leadshine are generally popular, ive seen these ones on ebay. any model better than others, anything to watch out for?all thoughts welcomethere used to be lots for sale on ebay, but mainly seems to be leadshine drivers at the moment, not many servoshttp://www.ebay.co.uk/itm/CNC-Leadshine-Closed-Loop-Hybrid-Servo-Drive-Kit-HBS57-Driver-Motor-encoder-/251942156746?hash=item3aa8ec39ca:g:EiAAAOxydlFSutQ h

[JAZZCNC]

Can I ask Why you want to change.?

I've used this setup and while they work very well the only reason I'd use them over standard stepper is because the motors are 3 phase motors which give much smoother operation and stronger thru out the rpm curve compared to 2 phase steppers. The actual Closed loop isn't that important or needed if normal steppers are sized and tuned correctly.

Normal 2 phase steppers matched to decent digital drives like leadshine DM, EM or AM drives give great performance and reliabilty for the money. You'll get DM556 and 2 or 3nm Motor for around half the cost of the C-loop and if run with around 44v they'll work great. If the gap was closer on price I'd say go C-loop for 3 phase motors but unfortunatly it's not.

Also if looking at the Larger C-loop motors then I'd look towards servos because most are just normal 2 phase steppers which offer no advantage other than the C-loop over normal steppers.

[andy_con]

I have a denford triac with original stepper setup, so standard nema34 steppers, controlled via digiplan drivers, connected to a pmdx26 via a home made 5v to 24v board.

so I don't have micro stepping, which I would like. my current max speed is 1200mm/m which is pretty slow.

so I want to increase steps and speed up

two of the stepper motors are 25 years old

[JAZZCNC]

I have a denford triac with original stepper setup, so standard nema34 steppers, controlled via digiplan drivers, connected to a pmdx26 via a home made 5v to 24v board.

so I don't have micro stepping, which I would like. my current max speed is 1200mm/m which is pretty slow.

so I want to increase steps and speed up

two of the stepper motors are 25 years old

Well in that case I'd give C-loop a miss because pretty sure all the 34 motors are 2 phase motors. Those you linked to are Nema 23 and only 2nm.

If you buy Am882 drives for around £50-60 each and fit motors below and run them around 70Vdc you'll transform the machine. In fact just the drives alone and some more voltage will make big difference.

https://www.cnc4you.co.uk/Stepper-Mo...4808-02-Nema34

[andy_con]

thanks for the link

have you ever used the leadshine hybrid servo to compare agains standard steppers?

[JAZZCNC]

thanks for the link

have you ever used the leadshine hybrid servo to compare agains standard steppers?

Yes and like I say the 3 phase motors are noticebly smoother and hold torque higher up the speed curve. But the larger 2 phase motors work just like normal steppers to me but with closed loop feedback to drive. Good digital drives and normal 2 phase steppers give the same performance to me.