The drill mill at the museum started doing that a few years ago, it has a 1 1/2hp single phase motor. There was a thermal cutout on the motor which was failing. Since replacing it there has been no more trouble. I'm sure somebody can point you in the right direction for getting one of these, I can't remember the details.

Hi gary,

Some time ago I had a problem similar to yours and the cause could be the same.
Using the browser, please, search for the following, full, string:
site: https: //www.model-engineer.co.uk/ dcosta bf20
Perhaps you will find useful information …

best regards
Dias Costa

Edited By dcosta on 11/04/2020 16:25:24

Hi Gary,

Condensation is bad for electronics, if you pull the boards check carefully for corrosion or tracking (power flowing between tracks.)

As the mill fires up and works briefly, I suspect an intermittent fault. These can be caused by contacts moving as the board warms up, or by motor vibration. Poor contacts are likely if condensation has got into the works but it can often be fixed simply by working switches and pots to and fro, ideally with a squirt of switch cleaner. At the board, wires are more likely to be plugged and socketed or screw-terminaled than soldered. It's worth making sure these are correctly seated. Also, try unplugging and reconnecting to wipe clean the pins. If these are visibly corroded, clean what you can off first but don't be too aggressive (pins are often plated).

Bad solder joints often look grey and crystalline rather than shiny silver. These can often be fixed by remelting the solder with a dab of fresh. If that doesn't work, remove the solder with a sucker and clean the metal underneath : corrosion or dirt will stop the joint forming properly.

I used to enjoy diagnosing faulty electronics. Now I'm older I lack the patience! If the fault isn't obvious I've decided there's no shame in replacing the whole board. Shameful but true.

Good luck,

Dave