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No7 Taper Pin Source

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peak417/10/2018 23:28:01
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782 forum posts
67 photos

Good evening folks, would anyone know of a source for just one or two 13/32" taper pins please. I might as well go for a 6" one and cut according to how much I need to ream out.
I've spotted an ebay source, but they only do bags of 5.


I've checked the links in the previous threads on here to no avail.

It's for a clapper box pivot pin on a recently acquired Boxford shaper.

It's currently fitted with a 3/8 one, which is at the limit of its adjustment.

I've borrowed a No.7 reamer from a friend, but not about to try using it unless I can source a pin first.

If all else fails, I guess I could make one, as I have the reamer to clock from, to set the taper on the lathe. Any thoughts on material? EN8??

Cheers

Bill

David George 118/10/2018 07:40:54
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839 forum posts
292 photos

Hi Bill standard taper pins are made from mild steel it sounds that you would be better off with making your own I would use EN40 or P20 type pre hardened steel.

David

Oily Rag22/03/2019 22:50:11
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22 forum posts
9 photos

Taper is 1 in 48 for imperial taper pins (as opposed to 1 in 50 for metric) also pin is defined by the measured from the small end for imperial pins (IIRC??). I've got a nice small capstan tool with a tapered 'slide' for making imperial pins, a sort of capstan 'taper turning attachment'! I made it as an apprentice 50+ years ago.

peak423/03/2019 01:21:27
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782 forum posts
67 photos

Thanks for that Oily Rag, I did make one in the end, well two actually so they should see me out nicely, but I can't remember what material I used.

I turned it between centres from what I remember, using a boring head in the tailstock for the calculated offset, and then fine tuned it with blue. I used a bar twice as long as needed, then swapped end for end and chopped it in half.

The shaper's clapping away quite happily now.

Bill

Oily Rag23/03/2019 20:30:16
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22 forum posts
9 photos

Hi Peaky - sounds a blinder!

Good to hear the shaper is clapping away nicely now, you just can't beat that sound. BTW have you found a source for swan neck tools for the shaper. I have an ex- REME WWII mobile workshop Atlas 7" shaper which I had given to me by a farmer, it was a heap of rust when I dragged it back home but is now re-conditioned and working well. With care of set up it will maintain a 0.0002" tolerance for flatness on the full machine envelope.

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