Re: [CAD_CAM_EDM_DRO] Re: I am looking for Lathe Cutting tool parameters for CNC

glee@... wrote:

>David wrote:
>
>
>
>>By the way I highly reccomend that you consider tooling that uses
>>inserts. On a lathe these can be very economical and the data you
>>need is easly obtained. Inserts are less that $4 a piece, on a
>>triangular insert that is three cutting surfaces for a buck and change
>>
>>
>each.
>
>Thanks, Dave.
>
>I believe that when you go this route, you are committing to a particular
>family of inserts.
>
>

Of course! But, it is amazing what you can do with one well-selected
triangle insert.
I use almost all positive-rake triangular inserts. Enco sold a 5-piece
set of holders for
the same insert, a TTT-222. This is a molded triangular, positive-rake
cutter with a
molded-in chipbreaker groove. because it is positive rake, it has only
3 cutting
points. The 5 holders hold the inserts in 5 different orientations, for
left and right
turning, facing, and cutting both ways. You can get many different
variations on
the same insert, with different point geometries, rakes, chipbreakers
and carbide
compositions. This set was with a 3/8" holder, and 1/4" inscribed
circle inserts.
I'm pretty sure there is a corresponding set with 1/4" holders and
smaller inserts.
I use this same set almost exclusively, only using other cutters for
special form
tooling or threading, for the most part. The advantage, especially for
CNC, is that
you get a very repeatable cutting edge after replacing or indexing the
insert.
You certainly can't do that with a hand-ground cutting edge.

>Do you have any favorite recommendations for insert tooling for a small CNC
>lathe like a Sherline that uses 1/4" square shank tools?
>
>

I would think an appropriately-sized set of similar holders and inserts
would work fine on
the Sherline. Make sure you get positive rake, as the cutting forces
are much less, and
therefore attainable on small lathes.

Jon