Tapers

Tapers

This topic has 4 replies, 4 voices, and was last updated 27 December 2011 at 15:53 by Sub Mandrel.

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24 December 2011 at 13:34 #80389
Wolfie
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@wolfie
OK next round of silly questions

I want to make some tommy bars for a couple of things. Now as it stands they appear to be tapered so they don’t fall out again.

Now how do I go about that? I know you can make a taper with a taper reamer but to what diameter do you drill the pilot hole, presumably the smaller diameter?

And how do I taper the bar, in one case its quite small. Doing it in my lathe seems like a bit of overkill.
Advert

24 December 2011 at 13:34 #5808
Wolfie
Participant
@wolfie
24 December 2011 at 13:39 #80392
David Littlewood
Participant
@davidlittlewood51847
You can get taper pins up to a quite respectable size, and these are made with the same taper as the taper pin reamers (though be aware that the taper is slightly different for metric and imperial ones). I used taper pins in this way to make handles on my pillartool and VDH – no way was I going to spend half a lifetime making ball handles for the thing!

David
24 December 2011 at 16:22 #80414
JasonB
Moderator
@jasonb
You can also just use a good fitting drilled or reamed hole and knurl the centre section of your chosen bar, this increases the dia slightly making it a tight fit in the hole.

j
27 December 2011 at 15:53 #80605
Sub Mandrel
Participant
@submandrel
For non-critical things, like a clamp for the drilling table, a centre punch will raise enough of a bump to stop a tommy bar falling trough a well fitting hole.

Neil
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