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Author Topic: Spindle speed  (Read 2344 times)

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Spindle speed
« on: July 04, 2008, 10:34:55 AM »
     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
Edison

Offline jimpinder

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Re: Spindle speed
« Reply #1 on: July 05, 2008, 03:10:56 AM »
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.
Not me driving the engine - I'm better looking.
Re: Spindle speed
« Reply #2 on: July 05, 2008, 10:09:46 AM »
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¡£
Edison

Offline jimpinder

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Re: Spindle speed
« Reply #3 on: July 06, 2008, 03:49:42 AM »
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.
Not me driving the engine - I'm better looking.