Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: Bob La Londe <none@none.com99>
Newsgroups: rec.crafts.metalworking
Subject: Re: Carbide on antique lathe again
Date: Sat, 24 May 2025 12:50:37 -0700
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On 5/24/2025 4:17 AM, Jim Wilkins wrote:
> Things have changed since I asked this, I found a Baldor-type carbide 
> grinder and a diamond wheel for it and tightened up the worst wear on my 
> SB Heavy 10 by surface grinding the compound base. I acquired a GTN-2 
> cutoff holder and a very stiff boring bar for 1/4" IC triangular 
> inserts. Both cut the rock drill rod to a smooth finish and haven't 
> (yet) chipped. Though annealed the steel is still hard enough to quickly 
> dull HSS if not in back gear.
> 
> This says a solution is possible.
> https://www.thegallos.com/carbide.htm
> https://www.thegallos.com/response.htm
> 
> Can anyone suggest specific inserts in those sizes they know to work 
> well on a slow worn lathe, preferably 'affordable' ones from a dealer 
> that sells them individually like LMS? The ones I bought from an Enco 
> store the first time I tried carbide soon chipped. They were C5 and C6 
> grade, maybe I should have tried C2.
> 

I can't promise the same results, but I have had very good luck with 
small stainless/alloy geometry DCMT inserts.  Lots of hobby lathe guys 
use them.  I think because of their small total size the chip breakers 
are forced to be smaller allowing them to work on lathes that have to 
take a smaller cut.  I can't make chips that go CLANK when they hit the 
floor, but they are better than you might think.

I have NOT found an insert I like for parting.  I am still hand 
sharpening and hand cutting the chip breaker in M42 HSS parting blades 
at reduced speed.

Some time ago (not that long) I posted here about this.

Here is a quick video of facing, rough turning, and parting with a 
middle weight (2000lbs) mediocre rigidity 2hp lathe.


On Instagram
https://www.instagram.com/reel/DG6TaRwqKR7/?utm_source=ig_web_copy_link&igsh=MzRlODBiNWFlZA==

On YouTube
https://www.youtube.com/shorts/9pJTprbxqxI

After my previous post I bought a couple more tools to hold DCMT inserts 
including a boring bar.




-- 
Bob La Londe
CNC Molds N Stuff

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