Centroid Community CNC Support Forum

I have a Bridgeport R2E4 retrofitted to the Centroid kit. It's been perfect for years.

Yesterday, I fired it up, and attempted to speed the spindle up to about 4Krpm. It sped up most of the way, then something 'clicked' loudly, and now the spindle ONLY runs at about 1200 rpm. The VFD driving the motor shows no errors, so I'm wondering what about the AIODC might be causing that.

Thanks.

Lloyd

Following up: The spindle speed buttons on the M-series Jog Panel have no effect in manual mode (don't even light up), and although in auto mode they 'light up', they have no effect on speed. Changing the speed via the CNC-11 mill program has no effect, either.

I've checked all the fuses on the AIODC board, and those exterior fuses necessary to the installation. All good.

Lloyd

Disconnect the ALLIN1DC analog output from the VFD and see if you can measure the full 0-10V range at ALLIN1DC.

Oh, I also cannot hear the 'up-speed' or 'down-speed' relay clicking when I press the buttons in auto mode, but DO hear them clicking (with no effect) in manual mode. Huh? Mechanical?

L

If you have speed up / down on vari-speed head the previous suggestion does not apply. You will probably have to post a report and pictures to get any useful advice.
https://centroidcncforum.com/viewtopic.php?f=64&t=383

I have trouble-shot it a bit further. The speed-up/down air motor runs on command. The speed just doesn't change. So it has to be a mechanical problem.

ICK! I'm right in the middle of a job I can't afford to abandon for two or three days, waiting for parts. I hope it's something like a sheared pin, and not a broken gear or ball nut!

L

those air motors on the bports that they use for the speed up down always gum up, i've had to take them apart and clean many of them to get them to work properly. its an easy job. hopefully that's what is wrong with yours

the next failure point that i ran into on those machines is the solenoid coil