Dremel fried again

I just opened my Dremel since I fried it the other day (again).

This time I might have really done it.

Every coil on the armature is good (reading around 8 ohms). But the stator has one coil reading 8 ohms and one coil reading open.

You’d think it could run on one coil but they may have them in series. Nuts.

Looks like a huge job to uncoil and find the issue.

Good thing I have a backup Dremel.

New Dremel has different diameter

In the end I was able to mount it by removing the bracket and clamping it over top rather than trying to slide it in.

It’s rather rude that they’d change the diameter of their tool. I guess they need to make improvements and cut costs. I’d want to say improve performance but my new Dremel is no where near as fast or high torque as my old one. But it’s still an awesome tool.

I love my Dremel Mototool

I’ve had one of these things off and on since childhood.

If you make things, this is a must for your toolbox.

Safe if used with care. Always use safety googles and avoid the use of the razor disks. I think they discontinued shipping dremels with those. My friend Andy cut himself so badly with that cutter that he put his arm in a cast.

Mount for RotoZip

spacer for rotozip

Rotozip ideal mount:

 

Upper hole: 2 5/8″
Lower hole: is 1 11/16″
Distance between two plates: 1 3/4″

Dremel mount dimensions:
1 7/8″ hole

Given that I have a dremel mount, I’m going to try to make a spacer to I can use the same mount for both.

So I need a spacer with an inside diameter of 1 11/16″ and outside diameter of 1 7/8″.

spacer

Here it is! Damn I like CNC.

I think this is ultra high molecular weight plastic.

I’m not sure because I got it from a scrap bin.

Whatever it is sure cuts nice.

No heat.

No noise.

No jamming.

Total fun and games!

Yippie!

Dremel fuse and control

dremel amperage

Seems my CNC controller has a 10 amp relay for spindle control.

I want to connect my dremel to it so it will come off and on automatically. I’m assuming that should be fine because on the Dremel site the most similar dremel specifications shows just over 1 amp.

I also want to add a fuse to the mix so I don’t fry my dremel if it stalls.

Anybody know what a good fuse size to use would be?

My first guess would be about 2 amps. I’d guess if you stall the dremel the amperage would probably go above it’s manufacturer amperage claim.

Anybody ever put a fuse to protect your dremel?

Dremel Cooked

dremel

I was making some parts using my dremel as a small spindle and I managed to stall it.

What happened when I released the load was the dremel spooled up very weakly. It ran very weak for about 10 seconds then spooled down.

I was concerned that was the last time it would ever tun.

I immediately disassembled it and did an inspection. No visual damage on any of the armature or other windings.

Further inspection revealed that one brush was seized. How strange. I guess it may have arced and heated. I filed the brush till it could move freely and reassembled.

The motor now runs even better. Way more rpm. The brush may have been marginal. Thankfully as it broke the connection before the motor completely fried.

I suppose I need a fuse for the dremel.

It took me some time to figure out the cause but it appears that the chuck let the endmill slip and it plunged into the material too deep.

I’m not sure what to do but I am making sure the dremel chuck is really tight from now on.

Anybody know what size fuse to put inline with a dremel?

CNC Mill made from Polyethylene

polyethylene plastic mill

I spent some time getting the electrical going for the Polyethylene mill.

The electrical is a Nema 23, 3-Axis.

I wired it up with some nice long wires so I can add the drag chains later. I decided to just run it for a while before installing the drag chains.

I just used a dremel as a spinle motor. Not perfect but when you think of it, it’s great value overall.

It runs nice.