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| Scraper chatter http://luthiersforum.com/forum/viewtopic.php?f=10101&t=37363 |
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| Author: | hummingbird [ Sun Aug 05, 2012 8:00 pm ] |
| Post subject: | Scraper chatter |
Scraper chatter. You know what I mean. When the scraper skips across the surface of the wood causing a ripple or washboard effect. I hate that. When it happens I've tried changing directions, resharpening, slowing down, speeding up. Nothing seems to help. Does anyone know how to stop or prevent this from happening? |
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| Author: | Alain Moisan [ Sun Aug 05, 2012 8:15 pm ] |
| Post subject: | Re: Scraper chatter |
Well it depends. Sometime it's unavoidable, like when scraping partial end grain (neck heel for example, specially at the jonction of the neck heel and the neck itself). In these situations, I always end up sanding off the ripples. On other cases, it's on figured wood, where the grain runs in many directions. Alternating direction on every stroke helps a lot. Otherwise playing with the the scraper angle (not the vertical angle, but rather the angle the scraper has according to its direction. Think snow plow...). Alternating angle at every stroke helps also when none seem to make it right. Hope this helps. |
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| Author: | Markus Schmid [ Sun Aug 05, 2012 9:16 pm ] |
| Post subject: | Re: Scraper chatter |
hummingbird wrote: I've tried changing directions, [...] Have you tried skewing the scraper? It normally helps (a lot). Edit: I realized too late that Alain Moisan suggested exactly the same: the "snow plow". |
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| Author: | hummingbird [ Mon Aug 06, 2012 4:33 am ] |
| Post subject: | Re: Scraper chatter |
Excellent. I will try the snowplow technique. Thank you. |
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| Author: | Alan Carruth [ Mon Aug 06, 2012 8:30 am ] |
| Post subject: | Re: Scraper chatter |
One of the reasons I like the heavy scrapers is that you get much less chatter. The added mass reduces the amount of bouncing around. I never was able to get the edge work on a violin right until I got a heavy one. You still need to change the angle ('snow plow') with every pass, particularly on figured wood. |
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| Author: | Mike Collins [ Mon Aug 06, 2012 2:19 pm ] |
| Post subject: | Re: Scraper chatter |
What Todd &Alan said! Take your time & practice on scrap! Mike |
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| Author: | gozierdt [ Wed Aug 08, 2012 3:40 pm ] |
| Post subject: | Re: Scraper chatter |
If you take Fine Woodworking, or know somebody that does (your library may have it also), the July/August issue (#227) has an excellent article on how to sharpen your scraper. The best thing I took away from it was that I was using too much force and angle forming the burr, and too much force turning the hook, so I got big, uneven burrs. As Todd said, the large burrs I was getting don't work as well as a small, even, sharp burr. Do it right and you can reset the burr two or three times before needing to file and rehone the edge. The steel gets work-hardened each time you return the edge, and it lasts longer. |
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| Author: | B. Howard [ Wed Aug 08, 2012 7:08 pm ] |
| Post subject: | Re: Scraper chatter |
I find flexing the scraper harder can help stop chatter, of course the trade is it cuts with more of a scoop. |
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