|CHARLES lipscombe||22/12/2018 21:14:12|
|74 forum posts|
I don't know if I have just re-invented the wheel or come up with an idea that others might not have thought of.
I needed to make a number of 16mm balls in brass and doubted my skills on a grinder to make a good job of the form tool. In the end I got a flat piece of tool steel and simply cut a half-circle in it of the right diameter, using a solid carbide end mill.
This worked very well. The end mill was not a high-end specification one, it was a low cost item from Jenny at JB Cutting Tools (usual disclaimer)
|1114 forum posts|
Good idea but how did you provide front rake on the tool?
A "Conecut" drill can be used to make a tapered hole which is then cut back to produce a semicircular tool.
|Neil Wyatt||23/12/2018 15:10:29|
15697 forum posts
Dang, I posted a reply earlier but...
My approach is to drill a slightly angled hole in a bit of gauge plate, then trim off the excess. See MEW 276!
|CHARLES lipscombe||23/12/2018 19:31:10|
|74 forum posts|
I just placed a small piece of scrap under the front of the toolbit to raise the front and provide what looked like a suitable amount of rake. To the best of my knowledge the exact rake is not critical in this application. I used a spray can of WD40 to lubricate and cool the work in progress.
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