I made these before,? parted off using a hss blade. The cuts were somewhat dished,? but it was an interrupted cut with the slots already there.?
On Fri, Apr 21, 2023, 4:26 PM Gene Heskett <
gheskett@...> wrote:
On 4/21/23 14:25, Nick Andrews wrote:
> Now I know that for some folks parting off in the lathe is routine, but for
> some of us it's a real PITA.? Or can be.? I've tried using a nice HSS blade
> in a holder with lots of oil and freshly-ground tip and still got it
> pulling to one side, and now a 1-inch tall steel blade with carbide insert
> for the first time last night.? Yeah, I broke the insert.? And yes, it was
> a cheapo chinese insert.? As delivered, the holder body was not well made
> and the bottom of the slot for the tool was tapered, causing a tilt in the
> cutoff blade of about 3 degrees or so.? Imagine that from an ebay seller!
> So I put it in the the vise and milled the slot more parallel, which
> corrected the vertical angle of the cutoff blade, mostly.? I tried to
> minimize stick-out but still got too much chatter.? Part isn't that far out
> from the 4-jaw, but a tailstock center might've helped on chatter.
>
> This is on a piece of 1.5" steel rod I got left from a construction
> project, no idea what alloy.? Maybe I have the wrong speed going and need
> to crank it up for carbide cutting.? Heard people say many home lathes
> struggle to spin fast enough for carbide but that seems unlikely.? Haven't
> tested higher revs yet, wanted to get your thoughts.
>
> I saw a youtube video this morning? where a guy made a little foot from a
> piece of CRS that he bolted through his tool holder that sits on the top of
> the cross slide to keep it from bending down which seems interesting, but
> not sure if I could do that or not on my lathe.
You s/b able to, getting it the precise length is the secret. Do not
hold up on the tool holder bottom, but as directly under the edge of the
tool itself as you can get. Target shooters rifle rest sand bags will
help by absorbing the chatter before you hear it.
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Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
? soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
? - Louis D. Brandeis
Genes Web page <>
Nick Andrews
