Hi Guys,

For long enough I've had a flexible shaft set in a mount that I could fit into the toolpost of my Myford lathe.
Any way I needed to use it this morning to do a job. It only takes a few minutes to set it up.
Five minutes later I switch on the Dremal that runs it and weeee, bang clatter bang, screech, all stop.
The electronic speed control goes short circuit, and the motor goes into full bore. The grinding stone in the chuck decides that it wants to run around in circles and promptly seizes up.
Net result the bearings in the flexible handpiece couldn't stand the strain of the grinding stone shaft bending through 90 degrees.

So after getting over the shock and still needing to get the job done, and having another Lidl special Dremal tool, I decided to make a similar mounting for it so I could do the same as I had with the flexible shaft.


30-09-2018-007.JPG 30-09-2018-008.JPG 30-09-2018-009.jpg
I had I bit of 1/2" inch aluminium bar approximatively 50 mm X 38 mm. So I marked it out for a hole on the centre line, and 25 mm in plus 12 mm for the bit that goes into the lathe toolpost. Centre popped it. Stuck in in the four jaw chuck, and after centering it up, drilled a 16 mm hole with a blacksmiths drill. I then used a 12 mm slot drill as a boring bar to open out the hole to 18.5 mm to suit threading 2 mm pitch for the thread on the end of the Dremal copy. I used the same threading tool and carbide insert as I have shown before.


30-09-2018-005.JPG 30-09-2018-006.JPG
This is the threaded end on the Dremal. There was a plastic cap screwed on here which is where the flexible drive would be fastened to.
Those threads are not the best I've seen. The damage to the first thread was caused by me trying to test fit without removing the mount from the chuck.


30-09-2018-003.jpg 30-09-2018-004.jpg
Here is the finished product fitted in my new Norman Tool Holder.
The abrasive wheel and shaft is Identical to the one that bent and became bin fodder.

I've spent most of the day doing what should have been a twenty minute job.
I think I've earned my dinner today and a nice bottle of Australian Shiraz

Thanks Guys.
Attached Images




Read the full thread at metalworkforums.com...