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Author Topic: Spindle speed  (Read 2744 times)

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Offline N4NV

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Spindle speed
« on: December 22, 2008, 09:14:48 PM »
I have been running my spindle from the speed control on a CNC4PC C11T
board with the 0v to 10v providing input to my VFD. It has worked
great for about 9 months. Today I tried to run the spindle. The
spindle speed started to behave strangely. First, the max voltage I
could get out of the C11T was 3.14V and that was setting the steps in
the motor turning at 190000. Previously I could get 10V with the
steps set at 1900. Another strange thing is the spindle speed drops
off very slightly when I move the mouse. I re-installed Mach 3
V.042.020 and ran the driver test, which came up excellent. I checked
the voltage to input of the driver on the C11T board and it is 14.96V,
the same as it always has been. I also checked the voltage adjustment
on the board next to the 0 to 10v output and it is still set properly.
This computer is not connected to the internet and is only used to
run this lathe. Nothing has changed since the last time I ran the
spindle, about 3 days ago. All of the other motion works correctly.

I am using Mach3Turn.

I contacted Arturo and he thinks it may have something to do with
Mach. Any suggestions?

Thank you


PS, I posted this question on yahoo groups as well.

Offline jimpinder

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Re: Spindle speed
« Reply #1 on: December 31, 2008, 10:13:33 AM »
I had trouble with my spindle control, which works on the PWM through a Digispeed to an Omron inverter. Probably much like yours.

The only way to check that Mach is putting out the correct PWM signal is to check the waveform with an oscilloscope, and try various speeds and see the waveform change.

If yours is a sudden fault, either your CNC4PC card has gone, but the other thing you might check is the pulley setting on Mach and the table of speeds for it.
As you probably know, you have to select a pulley, and write in the maximum and minimum speeds for that  pulley. Mach will not set speeds outside that setting.
Make sure they have not altered.

Not me driving the engine - I'm better looking.