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Shear scraper

Doug

Doug

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For many years I've used my skew chisel as a shear scraper but whilst sorting through some of my very old turning tools I came across a couple of big old scrapers I'd not used for years, so decided to reshape one as a shear scraper, this is the old tool shown side by side with my 1" skew.


image_zps8jeb7qoz.jpeg


I marked up the shape I wanted & cut the waste away with a 1mm slitting blade in the grinder, as this is carbon steel I kept quenching the blade in water as I went along.

image_zpswh1rlbo5.jpeg


Then it was on to the proedge for final shaping.


image_zpsyofbg3fl.jpeg


I tried it on the walnut platter I made this afternoon but need to grind a shallower angle on the top as I wasn't completely happy with how it performed.

image_zpsgubseuxg.jpeg
 
B

Bigblackdog

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how do you sharpen a negative rake scraper- do you touch up both bevels, and does it matter which one you do first. I am using a proedge too if it makes any difference.
 
Doug

Doug

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I grind the bottom angle as I want the burr facing up hill, if that makes sense. As long as you can feel a burr as you run your finger over the edge it will cut.

I did 60 degree on the bottom bevel Woody & 45 on the top, think I'd be better around 20 degree
 
Neil Lawton

Neil Lawton

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I've been using one like that for a couple of years now.
Bottom grind 45, top grind 25. You just touch up the bottom grind in everyday use.
 
Penpal

Penpal

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Wow Doug I have intentions to follow suit in some of my scrapers you will have saved me a real lot of grinding to acheive a useful shape using an angle grinder many thanks Doug I agree with yourself and Neil re the angles. Love your new and improved shear scraper beaut pics iI felt right there as you made it a work in progress. Thanks mate this to me is what its ALL about sharing indeed at its finest.

Peter.
 
Bill Mooney

Bill Mooney

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Bigblackdog said:
how do you sharpen a negative rake scraper- do you touch up both bevels, and does it matter which one you do first. I am using a proedge too if it makes any difference.
Click to expand...
I just sharpen the bottom bevel.
It's a good save Doug. The tool is too good to be gathering dust.:thumbs:
 


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