Dumore Series 37 Drill Rebuild

[Rapscallion]

Good job Eric.
Some pretty high speeds it has. Good for diamond bits, tiny drills and dremel tools.
It also has what looks like a proportionally small chuck and column. Like it was built for high-speed applications.
Nice little asset.

 

[echesak]

Thanks Folks.

@ Phil - To undercut the insulation, I used a V-ground tool bit from my lathe, mounted sideways in the bit holder. It was a little tough to line-up the bit with the insulation, but then it was just a matter moving the carrage to grind out the insulation and chamfer the copper. Not perfect, but it worked OK and it seems to run great.

 

[tertiaryjim]

Are you trying to limit your current because you're worried that your set-up will over-tax your power supply? or some other reason? You might give it a try without the resistors, as it may work fine. I was surprised how little current mine drew.

Eric

I was concerned that the electrolyte would be too conductive and tax the power supply.
Also as a safety as with lights I couldn't get full current if I messed up and ground the setup.
The mix of one table spoon of washing powder to one gallon water doesn't sound very conductive so I'll give it a try.
That would save me some time and effort.