angle problems

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Forum topic by Karda posted 09-19-2017 03:07 AM 593 views 1 time favorited 4 replies Add to Favorites Watch
View Karda's profile


2277 posts in 1326 days

09-19-2017 03:07 AM

don’t know where this goes. I bought a general type protractor to measure the angles on my turning tools and am having problems. I set my grinder to the angle on my hurricane scrapper, 70 degrees and made a round scrapper, a perfect 70 degrees. But when I measured the tool rest with my angle finder from HF they do not match, what am I doing wrong. I am very math challanges and of course no geometry or tri. can you help. here is a pic of the HF tool

4 replies so far

View Woodknack's profile


13391 posts in 3153 days

#1 posted 09-19-2017 04:18 AM

Make a 4” square of plywood, mdf, or something like that. Cut each corner to an angle that matches your turning tools. To use the jig, set one side on the grinder tool rest and the other against the wheel.

Here is a commercial version that does the same thing.

-- Rick M,

View Karda's profile


2277 posts in 1326 days

#2 posted 09-19-2017 05:58 AM

I tried that, the angle finder would not find the same angle as the pattern, not even close. I must be using the finder wrong

View HokieKen's profile


14023 posts in 1911 days

#3 posted 09-19-2017 11:53 AM

For the angle of the tool rest to be the same, it would have to be a flat wheel. It’s not. If you line the tool rest up at 70 degrees, then the angle that is formed between your bevel and the tangent to the wheel is 20 deg. However the angle of the tangent to the wheel will vary with the proximity of your rest to the wheel, how much the wheel is worn etc…

Long-story-short, the method your using won’t work consistently. Do as Rick suggests and make a gauge to set the rest. Or, IMO, the easiest method is just to use the bevel on the tool your sharpening to set the rest position.

-- Kenny, SW VA, Go Hokies!!!

View Karda's profile


2277 posts in 1326 days

#4 posted 09-19-2017 06:28 PM

ok thanks I’ll stick with the protractor. I did notice that when the rest is set to 70 degree tool the angle finder read 20 degrees. I make a template thanks

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