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From: Bob La Londe <none@none.com99>
Newsgroups: rec.crafts.metalworking
Subject: Those Cheap Diamond Inserts
Date: Sun, 28 Jul 2024 16:45:23 -0700
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I was struggling trying to face some big 304 stainless mold inserts to 
length.  1.5" diameter & 1.375" length.  Saw cut of course.  Parting 
these off is an exercise in frustration.

For most stainless work I hand sharpen HSS Cobalt bits, but I was 
struggling with my facing tool and to get decent finish would have to 
touch it up after ever pass.  I guess I could move the grinder over by 
the lathe (cringe) and set a diamond bench stone on the tool cart, but 
it was rough.

Now as some of you know a lot of mini lathe users swear by those little 
21.51 or 21.52 DCMT diamond inserts.  I had one tool with one in a tool 
holder and I tried it because nothing else was working for me.  I 
finished both ends with a single pass on each end of the last six parts 
with one insert that looks the same when I finished as when I started. 
After I finished I started going through my box looking to see how many 
spares I had.  Ummm. Zero.  There were two broken ones on the head 
stock, but no spares.

The finish is decent.  I just bought some more that are listed as 
alloy/stainless.  Also another turning tool, and a boring bar that uses 
them as well.  I almost bought a through coolant solid carbide boring 
bar too, but that will have to wait until the next job comes in the shop.

I don't even think I was using it right.  It was a right hand turning 
tool and I was just face/plunging it into the saw cut end pushing a cone 
off the middle as it finish.  I was amazed at how well it worked with 
such an aggressive cut and no chatter.  I even considered turning up the 
speed.


-- 
Bob La Londe
CNC Molds N Stuff

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