Dremel Flex Shaft Oiling

While using a Dremel cutoff wheel to shape a lathe bit, the flexible shaft sounded not quite noisy, if slightly less smooth than before, so easing some oil into the drive shaft might be a Good Idea. The springy shaft slides out of the motor end without disassembly, but, just for completeness, I took a look inside the handpiece:

Dremel flex shaft - handpiece internals
Dremel flex shaft – handpiece internals

Before removing the two obvious screws holding the handpiece together, remember to remove the steel ring at each end. The tail ring is obvious:

Dremel flex shaft - tail ring
Dremel flex shaft – tail ring

The nose ring wasn’t where I expected it, but released easily after the obvious mistake revealed itself:

Dremel flex shaft - nose ring
Dremel flex shaft – nose ring

The steel shaft spun freely in its bearings and the matching end of the flex drive shaft had plenty of grease:

Dremel flex shaft - drive detail
Dremel flex shaft – drive detail

So I just reassembled everything in reverse order. The trick is to line up the existing indentations in the outer sheath with the bumps inside the handpiece shell:

Dremel flex shaft - housing detail
Dremel flex shaft – housing detail

After all that, spreading a few drops of high-speed spindle oil along the spring drive shaft seemed appropriate.

Didn’t make the least bit of difference to the sound, but I feel better.

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