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Negative Rake Scraper Grinding Angle

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Forum topic by mike02719 posted 04-08-2021 01:24 PM 229 views 0 times favorited 3 replies Add to Favorites Watch
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mike02719

300 posts in 4842 days


04-08-2021 01:24 PM

I bought a piece of 1 1/2×3/8” HSS to make a round nose negative rake scraper. What recommendations do you have for grinding angles, and length of handle?

-- Mike, Massachusetts


3 replies so far

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TheDane

5952 posts in 4719 days


#1 posted 04-08-2021 04:05 PM

I grind the bevels on mine to 30 top / 50 bottom … I’m told any angles work so long as they total less than 90.

Mine has a 14” beech handle (it is a reground Hurricane scraper ).

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

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OSU55

2774 posts in 3045 days


#2 posted 04-08-2021 05:55 PM

I grind mine 30/30. I can flip them and raise a burr. Any combination less than 90. Honing off the grinder burr and turning a new one with a pice of carbide will provide a cleaner cutting and longer lasting burr.

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Andybb

3251 posts in 1659 days


#3 posted 04-08-2021 07:35 PM

Homemade. Not the prettiest but it works. I think I used 30 degrees. I tried using the HSS from the original tool. I could grind it to the right angle but didn’t have a drill that would go into HSS so I cut off some other tool or long bolt.(which I can’t remember) Here is the link to my posting last year with suggestions from members.

-- Andy - Seattle USA

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