|Forum topic by ben||posted 07-21-2008 04:00 AM||3180 views||15 times favorited||11 replies|
07-21-2008 04:00 AM
Previously, when tuning my card scrapers, I have basically followed the wood whisperer’s method, and gotten good results. But recently, for reasons still unknown to me, it completely failed to produce a burr. So I went back, and watched the video. Then I watched the Brian Boggs video that he suggested, and after watching that, decided to try his method instead.
So I now use Marc’s slotted file holder to file the card square, and Brian’s slotted card holder to clean the edge on the stone. Brian mentions using a carbide router bit shank in a block of wood as a burnisher, and I thought about it for a minute, and made the best version I could think up. And I must say, kudos to Brian, because it worked like a charm. From scrap cherry, the scraper jig for the lazy perfectionist:
Note that the burnisher and the card slot are at appropriate angles, so I literally just put the rod in, and slide the card in the direction of the arrow. Too easy. Thinking not required.
And of course, the results (which are the best I’ve seen in quite a while):
Making it was fairly trivial. First, figure out which drill bit will allow you slide your burnisher in, but with enough tightness that it will stay put. Then drill an angled hole, 10-15 degrees. (This taken from Boggs and other various sources.) After that, figure out which way is most comfortable for you to hold your jig while handling the scraper (push or pull). Then cut an angle so that the burr you’re creating will not “crimp”—ie, the angle is not acute. I did this by roughing a 45 angle, then eyeballing it on my bandsaw table and cutting to depth to match the burnishing hole. Finally, draw an arrow to remind yourself which direction to go in.
Note—I’m not explaining the crimping thing very well, but think of it this way: if you are burnishing the burr, you could be “squishing” it by making a V between the rod and the card, or going perpendicular, or going with a wide angle (obtuse?), so that the pressure “trails” the burr. You want the latter.
Second note—I don’t think the above explanation is any better, but if somebody wiser than me comes along, I will happily integrate all improved descriptions of this :)
Anywaiz, just thought somebody else might benefit from my 5 minutes of work. I sure did.