1/32 Taper pin

I am working on a steam engine plan that calls for a 1/32" taper pin to be inserted into a crosspin. I can of course make the pin quite easily. But how would I cut the hole. Is there a cutter or drill available or must I make a "D" bit.

Any advice much appreciated.

I think I have only seen taper pin reamers going down to 1/16" but having not looked for 1/32" they may exist.

You could probably get away with using a watch makers broach to add a slight taper to the hole and turn your pin to match

EDIT the 8/0 would be about the right size but a bit spendy for a one off and very delicate, their hand ones don't go that small.

Edited By JasonB on 20/07/2018 09:12:54

Rod,

Standard taper pin reamers are available, in both metric and imperial versions [beware, the slopes are different], but if you are thinking of making the pin, It would probably be convenient to make a D reamer at the same settings.

MichaelG.

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Edit: post crossed with Jason's ... I agree with his comments, but would just mention that the five-sided broaches work better on brass than steel.

Edited By Michael Gilligan on 20/07/2018 09:15:41

Or drill/ream the hole parallel and make the pin parallel and stick it in place with Loctite, or even just a very light interference fit, or perhaps peening each end?

Edited By Hopper on 20/07/2018 10:29:08

Edited By Hopper on 20/07/2018 10:30:21

Clockmaker's broaches work well. They are not expensive, about £2 each when I last bought some. They have a taper of 1 in 100. Make sure you get a cutting broach not a smoothing broach. Unfortunately my favourite supplier, Meadows and Passemore are closed for a holiday and premises move at present.

Russell

An alternative method (or bodge, some will say) is to drill a parallel hole, and use a round needle file by rotating it anticlockwise in the hole to create a taper. You need a proper old-fashioned needle file, as the modern ones are not remotely properly tapered. Escapement files are the best if you can find (and afford) them, at the size you need. The rotating should be continued until there is evidence that the full depth of the hole is being enlarged (by looking at the swarf on the file) - and then if you measure the width of the file at each end of the patch of swarf you will have dimensions for you to make a pin.

Hope this a) helps and b) works for you

Cheers, Tim