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Bow tool ?

 
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Mat Roop
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Joined: 24 Mar 2007
Posts: 911
Location: Wyoming Ontario

PostPosted: Fri Jan 01, 2010 10:29 pm    Post subject: Bow tool ? Reply with quote

What is the method of cutting the knurl at the end of a bow where the button turns against it?... is it cut freehand or is there a tool for this?
Thanks, Mat
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Andres Sender
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Joined: 23 Mar 2007
Posts: 275
Location: N. CA

PostPosted: Sun Jan 03, 2010 1:16 am    Post subject: Reply with quote

Knurling is a horizontal lined texture created typically by hardened forming tools pressed at high pressure into metal.

I assume you mean the nipple? This can be formed in a lathe. I have done it with a milling cutter on a drill press. I think I've seen it done with a saw and a jig kind of like a miter box. I think I have also seen a hand tool which cuts them with a blade guided on a pilot shaft.
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Mat Roop
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Joined: 24 Mar 2007
Posts: 911
Location: Wyoming Ontario

PostPosted: Sun Jan 03, 2010 11:11 pm    Post subject: Reply with quote

Andres... Thanks for the info, and sorry for the wrong terminology... I looked for an identification of that part before I posted... but alas I could not find it. When you mention a nipple, I think of a short piece of threaded pipe.
No Matter... Now I know!
Would you know offhand the spec or make & Model for the milling cutter?
Thanks!... Mat
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Andres Sender
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Joined: 23 Mar 2007
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Location: N. CA

PostPosted: Tue Jan 05, 2010 4:57 pm    Post subject: Reply with quote

Hey Mat,

Sadly I can’t remember which cutter I used. It may have been a standard end mill, although today I’d try something very sharp intended for fine cuts in aluminum. I stopped making screw adjusted bows a while ago and never did settle on a method when I was making them.

The thing you have to watch out for is blowing out the wood beyond the cut.

I gather this can be done by hand too, so that’s another thing to consider. Maybe a simple mandrel with a guide for a specially ground file would work well here.
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Mat Roop
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Joined: 24 Mar 2007
Posts: 911
Location: Wyoming Ontario

PostPosted: Tue Jan 05, 2010 9:00 pm    Post subject: Reply with quote

Thanks Andres... I was thinking of the manual version too... hardwood guide blocks... one with a hole (snug fitting) to recieve the end of the bow, to set the depth of the cut ( lengthwise of the bow) , and a dowel (to fit the screw hole) with a shoulder to set the width of the cut ( along radius). Then it will be the choice of a chisel or file.
As always... thanks for your advice!.. Cheers, Mat
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Mat Roop
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Joined: 24 Mar 2007
Posts: 911
Location: Wyoming Ontario

PostPosted: Sat Mar 06, 2010 12:52 am    Post subject: Reply with quote

Sometimes we think too hard... here was the simple solution...
I just drilled a suitable hole in a scrap of hardwood and the slit & clamp helped to hold the bow firmly square and in place... apply a sharp chisel and presto in 5 minutes I was done.

Cheers, Mat
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Jack H.
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Joined: 24 Mar 2007
Posts: 346
Location: Israel

PostPosted: Fri Jul 09, 2010 5:48 pm    Post subject: Reply with quote

Nice job with the jig Mat, but there is a special nipple cutting tool.
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