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Michael Darnton
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kjb
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Joined: 06 Feb 2013
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 Posted: Tue Jul 02, 2013 8:54 pm Post subject: |
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| what is the radius on you brass part?? |
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Michael Darnton
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Mikes
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Joined: 28 Mar 2007
Posts: 80
Location: Vermont, USA
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| Posted: Wed Jul 03, 2013 12:14 pm Post subject: |
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I don't know the radius but Michael's comment hits the nail on the head. The wire ties are ok but not perfect, just use pliers to tighten them up. It would be nice to innovate a little more on that though! One thing you don't see is a little stop block that is in the V groove that the tool rests against to keep the tool from moving down. In use I cut the last 6 to 8mm of the purfling chanel into the corners by hand.
Best,
Mike Spencer |
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violinarius
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Joined: 14 Dec 2007
Posts: 171
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| Posted: Fri Jul 05, 2013 2:49 am Post subject: |
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| kjb wrote: | | what is the radius on you brass part?? |
http://www.darntonviolins.com/purflingmachine.php
You can see for yourself.
The tightest 'C' bout corner is a diameter of about 32 mm, so you can, with Michael's design, go into the concave corners, or just do the convex bouts, and leave the corners to the hand.
Karl Holtey Design Purfling Cutter
http://www.leevalley.com/US/wood/page.aspx?p=70837&cat=51&ap=1
You can see that you want a large radius on the brass pin so you will have the best of both worlds, concave and convex.
Is there a video of Michael's tool being used anywhere???? |
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ctviolin
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Joined: 07 May 2009
Posts: 961
Location: Roswell
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| Posted: Fri Jul 05, 2013 8:14 am Post subject: |
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| violinarius wrote: |
You can see for yourself.
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That looks like the exact cutter or bit I use when cutting my own purfling groove. The one that I couldn't remember the Manufacturer/Part No. for.
Mike or violinarius, do you remember the part no./supplier?
Thanks
ct
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ctviolin
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Joined: 07 May 2009
Posts: 961
Location: Roswell
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| Posted: Fri Jul 05, 2013 10:42 am Post subject: |
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| ctviolin wrote: |
That looks like the exact cutter or bit I use when cutting my own purfling groove. The one that I couldn't remember the Manufacturer/Part No. for.
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It just came to me.
The company I got mine from was RobbJack.
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Andres Sender
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Joined: 23 Mar 2007
Posts: 275
Location: N. CA
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| Posted: Fri Jul 05, 2013 3:28 pm Post subject: |
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SR-2-047 2 flute 
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violinarius
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Joined: 14 Dec 2007
Posts: 171
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| Posted: Fri Jul 05, 2013 4:33 pm Post subject: |
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| Andres Sender wrote: | | SR-2-047 2 flute |
Page 15 of their current catalogue has SR-2-047 2 flute.
http://robbjack.com/tools/catalog
0.047 inches is 1.1938 mm
You can get the TiN Coated version for a little more money.
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L P Reedy
Super Member
Joined: 02 Apr 2009
Posts: 276
Location: Brevard, NC
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| Posted: Fri Jul 05, 2013 7:42 pm Post subject: |
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| I use the 1.3 mm bit International Violin sells. I sure wouldn't want one any smaller. I'm on my second one now, after the first got almost imperceptibly dull. |
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