[storm2313]

I'm looking at the mounting diameter of the stock motors and believe they are Nema 17, but just want to be sure.

Thank you,
Vince

[port_huon]

They are NEMA 23 motors.

[storm2313]

Do you or anyone know the mounting diameter of these Nema's?

I just bought new Nema 23's and they are off slightly from the machines mounting holes.

[port_huon]

Which machine do you have?
The 6040 I have came with motors mounted but measuring them, they are NEMA 23 size.

[storm2313]

Mine did also but I purchased Nema 23 hybrid 570oz/in motors, there night an day difference in quality, but they aren't a direct replacement.

I have a 6040 Chinese Chassis.

[port_huon]

The hybrid NEMA23 motors that (for example) Keling sell, have the same hole spacing as the standard NEMA23 motors but the motor body is bigger. Is this the problem you have?

[storm2313]

These are the new motors I want to fit to the original mounting holes on the chassis. I tried mounting them as a direct replacement, but the holes are off slightly.

High-Torque Stepper Motor, Stepper Motor, Driver, Stepper Motor kit, DC Servo Motor, DC Servo Motor kit, Stepper Motor Power Supply, CNC Router, Spindle, and other Components. Automation Technology Inc

The specs for the motor mounting diameter is clickable on the bottom of the page.

[port_huon]

This is the drive from Keling (ATI) I was referencing.
Checking my 6040 with the standard supplied drives shows hole spacing of 47mm in line with the ATI documentation for but standard and hybrid NEMA23 motors.
Have you measured the hole spacing on the drives supplied with the6040?

[storm2313]

Honestly I haven't, but at 47mm according to your spec, and referring to the documentation on automationtechnologiesinc.com the hybrid motors mounting holes are 47.4mm so that would explain my variance.

I guess I have to open the holes slightly.:tired:

[port_huon]

The ATI spec for both drives gives the spacing as 47.14mm but there's a different tolerance = 0.2mm vs 0.35mm

Given the level of QC on the 6040's, I wouldn't be surprised if the holes were quite a bit out. Doing up the screws tight enough would pull them into (rough) alignment.

I'd be interested to see how your machine performs with the new drives in place.

[storm2313]

I will post a video, but needless to say I went to a Gecko G540, added limit switches, and now for a direct increase in holding torque on top of a new 1.5kw spindle.

It should be interesting.

[port_huon]

Wouldn't the 387 oz/in motors have been a better fit electrically as they are rated at 3.5 amp?
The 570 oz/in motors are rated at 5 amp so with a G540, you'll only get 70% of the rated torque.

[storm2313]

I would say your right but these are rated at 3.5amp. Check the listing and I confirmed it wasn't a typo by calling ATI.

[port_huon]

I would say your right but these are rated at 3.5amp. Check the listing and I confirmed it wasn't a typo by calling ATI.

OK, didn't realise that they had multiple 570 oz/in motors.

[storm2313]

I didn't either and I have to say for the price difference it's a no brainer. These motors are complete silk, very high quality.

I haven't adjusted the Gecko's motor tuning feature yet an they are very quiet.