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Luthier Tips du Jour

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Robbie O'Brien

Post subject: Re: Luthier Tips du Jour

Posted: Wed Sep 03, 2008 2:53 pm

Brazilian Rosewood

Joined: Wed Jan 19, 2005 5:23 am
Posts: 2356
Location: United States

JJ Donohue wrote:

A couple of issues I was hoping we could discuss about the scraper demonstration. I went back through my notes from years ago and found two issues that Mario brought up on a different forum prior to OLF.

1) The idea of bending the scraper seems to cause a depression on the surface. I have used scrapers and have always tried to keep them flat...especially around areas like the sides where we want to keep everything as flat as possible...just like a plane.

2) Turning the hook on both sides of the blade can be dangerous should ones hands slip. That edge just below our fingers can be as sharp as a razor. For that reason, I have kept an edge on one side only.

Thanks, Mario!

My comments are not intended to diminish the value of these videos...I will also subscribe on You Tube. Thanks, Robbie!

JJ,

In the video I don't go into honing the edge etc. as most of us, myself included, use a scraper for rough work and not finish work. For example, we use it to scrape bindings, end grafts, and centerstrips.
To avoid making depressions I say to scrape diagonally every couple of passes. This helps eliminate this problem.
The technique of filing an edge at a 45 degree angle and then rolling over one burr makes, IMHO, for a stronger burr and works well for all the situations I stated above.
I have never had an issue with cutting myself on a burr that has been rolled over on both sides of one edge of the scraper.
I have however received a nasty cut while using the burnisher to roll over the burr, so be careful guys and gals!

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Robbie O'Brien

Post subject: Re: Luthier Tips du Jour

Posted: Wed Sep 03, 2008 4:59 pm

Brazilian Rosewood

Joined: Wed Jan 19, 2005 5:23 am
Posts: 2356
Location: United States

JRE Productions wrote:

Very nice. I have seen several Tutes on scrapers. None of them have addressed sharpening the one seen at the opening of your video. The curvy paisley looking one. Whats the trick to those? Is tutorials comming on those?

Thanks!

Joe,

Sharpen them the same way except they have a rounded edge instead of a straight edge.

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ChuckH

Post subject: Re: Luthier Tips du Jour

Posted: Wed Sep 03, 2008 8:02 pm

Contributing Member

Joined: Thu Jan 24, 2008 8:01 am
Posts: 1399
Location: Houston, TX
First name: Chuck
Last Name: Hutchison
City: Houston
State: Texas
Country: United States
Focus: Build
Status: Amateur

Great video's Robbie. Keep up the good work and thanks for sharing.

_________________
"After forty-nine years of violin building, I have decided that the search for a varnish is similar to the fox hunt. The fun is in the hunt."
Jack Batts Maker and Repairer of Fine Violins

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