Mechanical lubricator ratchet wheels

I purchased a couple of 7/16" x 30 tooth wheels, I want fit them to an 8 BA spindle. The problem is the hole in the centre of the wheel 0,090" which is too big for 8 BA, the easy option would be to drill the centre hole out and fit a brass bush then drill and tap it 8 BA. The problem is the wheels appears to be case hardened and does not want to be drilled. Has anybody come across these wheels ?

Do the wheels need to be hardened? If not, anneal them. Alternatively grind off the case hardening or get a drill/cutter suitable for cutting hardened steel.

With reasonable care, they could be fixed using a suitable grade of ‘anaerobic retainer’

[ Loctite, PermaBond, etc. ]

MichaelG.

Tomorrow I make a stepped spindle and press fit the ratchet onto the over size shaft. As the wheel sits in the fork in the actuation arm, gluing would not be practical.

You could anneal, drill and then reharden. Press or Loctite the bush in once hardened.

If the wheels are case hardened would they anneal ? They are a dull grey colour so I assume they are not made of silver steel, machined then hardened.

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I have no way of knowing for sure, but that sounds like they might be sintered ... in which case, I wish you luck.

... could you post a close-up photo ?

MichaelG.

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Edit: __ I’ve just looked [at a 34 tooth version] on the Reeves website;

but it doesn’t help much 

https://www.ajreeves.com/6592.html

Edited By Michael Gilligan on 20/01/2021 10:35:16

Michael I think you may be right with the sintered suggestion. Looks like the spindle will have to be a push fit into the central hole in the wheel.

One old wheel one new, Neither will allow a drill to enlarge the central hole which is 0.090" I have ordered some 3/32" En1a rod to make a new press fir spindle.

They are not hard to make from silver steel with a simple single point tool.

Not quite answering the question, but lubricator ratchet wheels are very easy to make from silver steel and some simple tooling. A suitably ground HSS toolbit in the lathe will readily cut the teeth by traversing the saddle.

Division can be by means of a change wheel and detent mounted at the LH end of the mandrel, or possibly using the bull wheel on some lathes.

After parting off, the wheel is hardened & tempered back slightly.

Edit, can't type fast enough!

Edited By Clive Brown 1 on 20/01/2021 14:45:41

One way clutches are cheap enough, but you won't get one that small