Randy -
When I first hooked up the scope, I set the sweep to .1 ms per division so I could measure the 1000 RPM main spindle as a sanity check. After I found the signal way out at 10 ms sweep, the sanity part of the sanity check clicked in... A 60 ms period *is* 1000 RPM! After that, everything got pretty easy. Good thing I had a calibrated standard so handy.
I like the piano method of calibrating your spindle. Now you know that your dial is close enough, and that it really does go as fast as advertised. Your problem now is that you have to hum a few bars before you start cutting.
The sound of the Proxxon has bugged me since the first time I plugged it in. It just doesn't sound that fast, but now I know better. I'm starting to trust it.
Now for my main spindle... it doesn't really even get warm at 5140 RPM, so I'm thinking about calibrating it up closer to 7000 to see how much warmer it gets. It's a cinch to change the value in the file.
Regards,
- Just Gary
P.S. What's the difference between a piano and a fish? I warn you, it's a groaner.  |