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cutting the purfling channel
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Greg M
Junior Member


Joined: 04 Jun 2017
Posts: 14

PostPosted: Wed Nov 15, 2017 8:10 pm    Post subject: Reply with quote

L.P Reedy when you are making your cut , do you do it in 1 pass or 2. Also do you move the tool around the plate , or fix the foredom tool so it is stationary , then move the plate around the foredom. I will have to make up my mind because I have been stuck at this point for a month but I want to do it right. Thanks.
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L P Reedy
Member


Joined: 02 Apr 2009
Posts: 248
Location: Brevard, NC

PostPosted: Thu Nov 16, 2017 6:05 pm    Post subject: Reply with quote

I do it in one pass as much as possible. I only make a second pass when and where I slipped the first time.

I move the tool around the plate, which is already glued to the ribs. I've considered trying to make a setup with the tool stationary but feel like it would be too much trouble and require too much space.

If I had waited until I had purfling completely figured out 28 years ago I would still be working on the first one.

Lyle
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Michael Darnton
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Joined: 23 Mar 2007
Posts: 1123
Location: Chicago

PostPosted: Thu Nov 16, 2017 6:10 pm    Post subject: Reply with quote

It might be a good time to mention that if something goes wrong, it works fine to pack the mistake with plastic wood, let it dry for a day or two, then come back and plow a new path. The plastic wood will hardly be visible at all in the finished violin.
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Greg M
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Joined: 04 Jun 2017
Posts: 14

PostPosted: Fri Nov 17, 2017 9:36 am    Post subject: Reply with quote

Thanks guys again for all your tips and experience, have a good weekend.
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L P Reedy
Member


Joined: 02 Apr 2009
Posts: 248
Location: Brevard, NC

PostPosted: Fri Nov 17, 2017 7:35 pm    Post subject: Reply with quote

Thanks, Michael. I don't remember hearing that before and my plastic wood dried up many years ago. I'll have to get a new can.
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jethro
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Joined: 07 Apr 2007
Posts: 174

PostPosted: Fri Dec 01, 2017 1:28 am    Post subject: purfling cutter Reply with quote

Greg-
I used a dremel on my first violin. I got it to work with only 1 small BooBoo-
but it was nerve-racking to the max. So i decided there must be an easier way.
So I built a tool to do it. It worked all most effortlessly and made a good
clean trench.

I found ace hardware has miniture razor knift blades- they are about 3/4 inch long. I made a handle to hold them with 2 little dowel pins that the blades
thread onto. Then I made some spacers out of brass shim stock. The
handle holds two blades with a spacer between the blades. The spacers
set the groove width. The I put a steel "finger" on the edge of the tool which
guides off the outer edge of the plate.

You simply keep the finger against the outer edge--- and gently (for the first
pass) go around the plate. Then do a couple more passes a little harder.
that deepens the groove some.

Then I fabricated a very tiny chisel out of some piano wire. I skim that chisel between the 2 grooves--- and the wood between the 2 cuts just rolls out to a depth of the cuts. Then you make a couple more passes to deepen
the cuts and chisel out again. It really works easy and no stress.
Even the corners are pretty easy. Use a little diluted glue on the stings
before cutting to help stabilise the inside corners as they break easiest.

I can try to post a pic if anyone interested..........

Tim
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Greg M
Junior Member


Joined: 04 Jun 2017
Posts: 14

PostPosted: Fri Dec 01, 2017 11:29 pm    Post subject: groove cutter Reply with quote

Tim sure if you can put a picture together or video I would like to see this. I just received my 1/16" carbide bit from Stew Mac today and will attempt to try and see if this will work on my Dremel mounted vertically in my jig .Thanks I am always open to new ideas
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ctviolin
Super Member


Joined: 07 May 2009
Posts: 961
Location: Roswell

PostPosted: Sat Dec 02, 2017 10:26 pm    Post subject: Re: purfling cutter Reply with quote

jethro wrote:
Greg-
I can try to post a pic if anyone interested..........

Tim


Absolutely.
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ctviolin
Super Member


Joined: 07 May 2009
Posts: 961
Location: Roswell

PostPosted: Mon Dec 04, 2017 9:51 am    Post subject: Re: purfling cutter Reply with quote

ctviolin wrote:

Absolutely.


[img]
https://www.flickr.com/photos/85680750@N05/9159080843/

https://www.flickr.com/photos/85680750@N05/9168807473/
[/img]
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ctviolin
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Joined: 07 May 2009
Posts: 961
Location: Roswell

PostPosted: Mon Dec 04, 2017 10:08 am    Post subject: Reply with quote

[img]
https://www.flickr.com/photos/85680750@N05/9168818483/
[/img] [/img]
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ctviolin
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Joined: 07 May 2009
Posts: 961
Location: Roswell

PostPosted: Mon Dec 04, 2017 10:21 am    Post subject: Reply with quote

[img]
https://www.flickr.com/photos/85680750@N05/9182141833/
[/img]
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Greg M
Junior Member


Joined: 04 Jun 2017
Posts: 14

PostPosted: Sun Dec 10, 2017 12:53 pm    Post subject: Reply with quote

Well I finally got my purfling channel cut on the back plate. I just went with the Dremel 3000 and bought the 1/16" carbide bit from Stew-Mac . I did it on 2 passes and lowered the depth by removing washers 1 mm. thick at a time. The purfling drops in with a light cleaning of the groove and tapping it in slightly. I am really pleased with the results. Now to finishing the rest of the plate . Have a good Christmas everybody.
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