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Mechanical lubricator ratchet wheels

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Peter Simpson 119/01/2021 16:27:58
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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 ?

not done it yet19/01/2021 20:29:13
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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.

Michael Gilligan19/01/2021 20:41:06
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With reasonable care, they could be fixed using a suitable grade of ‘anaerobic retainer’

[ Loctite, PermaBond, etc. ]

MichaelG.

Peter Simpson 119/01/2021 21:20:39
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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.

JasonB20/01/2021 06:56:17
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You could anneal, drill and then reharden. Press or Loctite the bush in once hardened.

Peter Simpson 120/01/2021 10:23:19
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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.

Michael Gilligan20/01/2021 10:28:48
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Posted by Peter Simpson 1 on 20/01/2021 10:23:19:

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.

.

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.

.

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

but it doesn’t help much dont know

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

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

Peter Simpson 120/01/2021 10:46:38
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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.

Peter Simpson 120/01/2021 14:23:01
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Ratchet wheels

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.

JasonB20/01/2021 14:36:26
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They are not hard to make from silver steel with a simple single point tool.

Clive Brown 120/01/2021 14:43:57
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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

duncan webster20/01/2021 16:17:05
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One way clutches are cheap enough, but you won't get one that small

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