Bevel straight edge

I know nothing about scraping beyond trying to make a good number of contact points in a plane. How does that work for a fine edge? The edge forms a line instead of a plane, so any deviation (or scrape) would mean the edge is not straight between those contact points. Make sense? I understand scraping the planar surfaces, I'm just curious on how that works when those planes come to an edge.
 
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pontiac428 said:
I know nothing about scraping beyond trying to make a good number of contact points in a plane. How does that work for a fine edge? The edge forms a line instead of a plane, so any deviation (or scrape) would mean the edge is not straight between those contact points. Make sense? I understand scraping the planar surfaces, I'm just curious on how that works when those planes come to an edge.
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The front edge of the bevel is actually flat about 0.030“, even though it looks sharp in the picture. Best I can measure the ground surfaces are a tenth or so out of flat. So I’ll need to scrape them. Top, bottom, and bevel face. I intend to use it for lathe compounds and other small dovetail parts.
 
Fascinating, thanks! You're planning to use it to print prussian blue to the inside of a dovetail, that makes sense, since you are using the planes to do that. So it's really a geometric solid for your purposes, not an edge per se. Clear now! :cool:
 
pontiac428 said:
Fascinating, thanks! You're planning to use it to print prussian blue to the inside of a dovetail, that makes sense, since you are using the planes to do that. So it's really a geometric solid for your purposes, not an edge per se. Clear now! :cool:
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Yep. That’s exactly it. Printing insides of dovetails. Also a good practice job. If I screw it up. Just put it back on the grinder and give it another go.
 
@GT-6 Racer What is the length of this straight edge? How wide is the angled section? I'm guessing 10" and 1.250" from the pictures.
 
Dabbler said:
@GT-6 Racer What is the length of this straight edge? How wide is the angled section? I'm guessing 10" and 1.250" from the pictures.
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It’s 8” long the square sides are a little under 2”. Bevel is a little over one inch.
 
How much time do you think you'll put into it?
 
pontiac428 said:
How much time do you think you'll put into it?
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I have about 8hrs in machining the raw casting and grinding it. It’s square, parallel, and angled to within a tenth or so. As good as I can manage on the grinder. I expect another afternoon hand scraping to finish it up.
 
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