Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: mirzabala on February 05, 2017, 01:51:49 AM

Title: About the motors
Post by: mirzabala on February 05, 2017, 01:51:49 AM
HI,l use 34hs9840 model motor.l want to know the maximum and minimum velocity per mm in motor calibration,l use mach 3.thanks
Title: Re: About the motors
Post by: Tweakie.CNC on February 05, 2017, 02:48:46 AM
Generally, increase the Velocity until the motor stalls then reduce the Velocity by 30%. The Acceleration should initially be set at 10% of the Velocity figure.
After that 'trial and error' may be used for tuning to obtain best, reliable, performance.

The Mach3 manual (Section 5 and 5.5 in particular) details the setting-up procedure

Title: Re: About the motors
Post by: joeaverage on February 05, 2017, 02:53:16 AM
guessing these are 34 size steppers about 900 ozin?

Steppers lose torque big time when running fast, at 1000 rpm they are likely to have on 5% of rated torque.

Probably wise to say that max speed is 500 rpm. If you use 5mm pitch ballscrews then max axis speed is 5 times 500=2500mm/min.

You can experiment but this should get you close enuf to start with.

Title: Re: About the motors
Post by: garyhlucas on February 05, 2017, 09:02:50 AM
The torque fall off is primarily due to back EMF reducing the current to the motors. Higher voltage drives and power supply make a big difference. My machine has 80 volt drives and a 68volt power supply. I am running a job right now at 3000 mm/m and slowed it down from 4000 only because there are lots of small details.