Negative Rake Scraper Side

This is a side view showing how a negative rake scraper is ground. You will see these in the catalogs as hardwood or ivory scrapers. Batty actually grinds the longer bevel on the top. That way you only have grind the bottom until you get near the top. The way it is ground in the picture you have to grind the top and the bottom. I can't remember if the angles are critical, I don't think they are.

Photo Details

keith bundy

Registered: November 2004
Location: Cold Spring, Ky.
Posts: 347

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Date: Fri July 15, 2005
Views: 6,432
Keywords: negative rake scraper side

Comments

Chris Wright

Essentially Stuart's grind is yours only upside down Keith. I don't think the angles matter except for the upkeep/regrinding, but that is a question I'll have to ask when I see him this weekend.

#1 Fri July 15, 2005 6:03am

kengrunke

Batty says on his site about 60 degrees is the best.
I believe that means the included angle--but could be wrong. That would be a much sharper angle than is pictured here, which is about 100 degrees.
Or he means the angle of each bevel from the blade, then this would be in the ballpark.
Thanks for posting these pics Keith, they really help.

#2 Fri July 15, 2005 4:16pm

keith bundy

Glad I could help Ken. Just one thing, Stuart says that in M2 steel the tool only cuts cleanly for about ten seconds then you have to grind again.

Chris - Tell Stuart I said hi and maybe next time my wife calls him she'll let me talk.

#3 Fri July 15, 2005 7:50pm

paulporter

How does this grind work as apposed to a regular grind? And where would you use it, inside or outside of a bowl?

#4 Fri July 15, 2005 9:14pm

keith bundy

Supposedly, it should cut cleaner than a standard scraper and is less likely to catch. I don't know how it will work with all woods. I haven't tried it in my shop yet. Stuart uses it to clean up the wings on his pieces. Most of his work is done in Cocobolo and Australian burls. Hard, dense woods. He also has a Neg. rake tool with a rounded end and a long grind down the side for doing the inside of his winged bowls. It is similar in shape to Raffans box scraper but the cutting edge goes farther down the side.

#5 Sat July 16, 2005 12:49am

cfuller

That's different than anything I've seen before. It's one of those things that looks like it wouldn't work. But obviously it does. I have an old small scraper that I'll have to try it on.

#6 Sat July 16, 2005 2:02am