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(02-12-2019, 04:00 PM)enjuneer Wrote: If you like that one, Paul pontificates on scrapers and sharpening for over an hour and a half in this YouTube video for the Gwinnett Woodworkers group.
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Yep...and that's a good one also, Bob...
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(02-12-2019, 02:48 PM)Timberwolf Wrote: ...................
More on scrapers from Paul Hamler, who shares a few things about them.....starting about the ten mark...
Thanks, Jack, for sharing that clip.
Simon
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I dug th SteMac out last evening, never really used it much, as there is little
I cannot do without a card scraper. I did put a hollow grind on one edge and after a bit of experimentation, it worked very, very well!
Does anyone here know of what material that scraper is made of?
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I have a few really nice toothed scrapers. Most people use a different name for them. They call them rotary tool cut off wheels.
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(02-13-2019, 07:04 AM)Tony Z Wrote: Does anyone here know of what material that scraper is made of?
In the StewMac video, Al Carruth, the inventor, says it's "tool steel, very slightly tempered to about Rockwell C 62." In a blog, Alan described his first scraper made this way was O1.
http://www.alcarruthluthier.com/toolOfTh...craper.htm
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Allan Hill
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(02-13-2019, 08:26 AM)AHill Wrote: In the StewMac video, Al Carruth, the inventor, says it's "tool steel, very slightly tempered to about Rockwell C 62." In a blog, Alan described his first scraper made this way was O1.
http://www.alcarruthluthier.com/toolOfTh...craper.htm
Thanks Alan. Think I may make one about the size and shape of a card scraper, 1/4" thick, and dished out like my StewMac. Please bear in mind, when I say I may make, I really mean, one of my machinists will be doing a "government job". I was thinking O1, and I will use an outside heat treat source for heat treating and drawing to Rc62.
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02-17-2019, 11:36 AM
(This post was last modified: 02-17-2019, 11:37 AM by Derek Cohen.)
David, it is a 180 grit CBN wheel. That one came from Jim Carroll at the CWS Store (in Oz).
You would not (ever .. never!) want to use a diamond wheel at speed (i.e. heat) with a high carbon blade. Diamond is only good for carbide. With high carbon steels, the diamond wheel will disintegrate within a relatively short period (the graphite in diamond is absorbed by the iron in the steel). Stick to CBN - I think I got the ball rolling on these a few years ago: http://www.inthewoodshop.com/WoodworkTec...SetUp.html
Regards from Perth
Derek
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