Gallery, Projects and General > How do I??

Bent shaft

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John Rudd:
Another posing question to the collective minds

I have a steel shaft of 5/16" in diameter, one end has a set of gear teeth cut, the other fits in a pb bush...
The shaft is bent! ( where exactly I need to determine) but I need the scetion with the gear....

If I can cut it, so that the bent section can be thrown away and a new section 'grafted' into place....

What is the best way of doing this?

Assuming it can be done.....

Ideally I could do with a new shaft, but I cant cut the helical teeth... 😢

Pete.:
Chuck the end of the shaft in a collet and run the lathe slowly. Put a dial gauge on the shaft mounted on the carriage and move the dial away from the chuck until you see it start to swing. That's the start of your bend.
Now repeat it by putting the helical gear in the chuck. When the needle start to swing - that's the end of your bend. Mark both ends of the bend and then you can set about straightening it.

AdeV:

--- Quote from: Pete. on August 07, 2020, 11:53:09 AM ---Mark both ends of the bend and then you can set about straightening it.

--- End quote ---

You can also figure out exactly which way it's bending (so long as it's a simple bend, and doesn't have twist as well) - the highest reading will be when the bend is exactly horizontal and towards you.

Sea.dog:
Once you've identified the start and finishing points, chuck the part with the start held in a collet. Do you have a lathe centreing tool? (http://www.clickspringprojects.com/bump-lathe-centering-tool.html) If not, you need one. I've used this method before, fairly successfully to strighten the odd small diameter piece.

awemawson:
Sounds like an armature shaft to me  :scratch:

It is possible to 'cut and shut' armature shafts - in fact the motor on my Bridgeport has just that as when I got it's motor someone had sawn the working end off the shaft! I had the sawn off bit, so I mounted it and the shaft  in a collet, drilled and bored a suitable axial hole, then also a radial cross hole for pinning and assembled it with Loctite.

It's now been running for over 20 years so I reckon that the temporary fix can be regarded as satisfactory  :lol:

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