Mark,
How thick is the carbide and did you make longer handles for these scrapers? I'm looking at the half inch and the 3/8 inch.
David Hair
----- Original Message -----Sent: Saturday, March 19, 2016 4:48 PMSubject: Re: [GrizHFMinimill] Scraping updateHi David,
Here's the site items in store on eBay!
Note that as they come they are not suited for scraping metal -- they have the wrong rake angle. If you have a fine-enough diamond grinding wheel this will not pose a problem. As they come, they also have no radius on the business end. Also no problemo with the right grinding equipment.
FYI, all the various scraping resources I've seen indicate that a final pass with a 3,000 grit diamond wheel is sufficient. I just went a little overboard with my 14,000 grit final pass. Probably because I always examine things I've polished with a high power microscope (it's work-related, not OCD) so I know what a 3,000 grit "polish" looks like up close. It really isn't all that nice. By comparison, 14,000 grit starts to look pretty good. I really doubt that going to 50,000 grit would be of any benefit in this application.
To get a 14K finish you will need a lapping disk or wheel you can charge with 14,000 grit diamond. You can buy a "recharge roller" from a lapidary supply company or make one with a ball bearing mounted on a handle. I took the latter course because I had a bearing that was about the right size, and a steel bar that had the right dimensions to make a handle.
Mark
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