Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: Edison on July 04, 2008, 10:34:55 AM
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My spindle motor is the maximum speed of 3,500 and the minimum was 200,
PWM control methods used, they were the corresponding duty cycle
90% and 10%, how to set up £¿£¿
If I set a maximum speed of 3500, the minimum requirements for the duty ratio of 10%,
That the minimum speed so that I will become a 350, please help!
Thank you! !
Edison
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Yes - the minimum duty cycle will only go down to 10%.
How important is the low speed - bacause at 10% duty cycle your torque will be very small - on my lathe anything below 50% is in danger of stalling - even with a 2HP motor in place of the 1HP motor.
I cannot think - and I am sure someone will tell me - where the difference between 200 and 350 would spoil a job.
To properly run a spindle over such a wide range of speeds, and have a reasonable even torque over the whole range, you really need to introduce some pulleys in the system, unless your motor system is well regulated.
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My sense is that this will make my G code with the operating speed of the machine itself does not match,
Is not to say that the speed difference between how serious¡£
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The spindle speed will not affecr Mach 3. I do not think the difference between 200 and 350 will matter. The thing that matters is the top speed - i.e. 3500.
How is you spindle motor controlled now. Does it need an input voltage to control it from the computer?? You may need a Digispeed PWM to Voltage converter.