Re: [CAD_CAM_EDM_DRO] Inserts R US

Hello Tom,
Excuse me to respond so late, but here are so many post that this one I
found when I was cleaning up my inbox.
For centering just plane a face. The cutting edge should not be above
the center,
and not below ( a small pimp stays). The easiest way is when you have a
quick change
tool post with enough tool holders with screw adjustment. I hasted 6
years until finally made
myself more tool holders. Now with 8 tool holders the work is much
better but still I guess I should build me some 4 more.
For a simple lathe make the right shim and do not lose it.

For aluminum never use negative inserts. It clogs up like hell and
destroys your pieces.
The special aluminum inserts are milled out of HSS-E tool steel with an
extremely
positive angle ( 40 degree chissle angle.)
They are damn expensive.
So you should try with a simple cobald steel with the following angles:
free angle 10 deg.,
chip angle 25 to35 deg. resulting chissle angle 45 deg.
Personally for standard facing and roughing jobs I love 55 degree rombus
inserts.
(In steel DNMG ) they last long and do not break the tips.
I hope this helps.
Sven Peter

Tom Eldredge wrote:

> I just yesterday purchased a tool and insert combination to face finish
> aluminum disks. It is a VNMG carbide insert, This tool holder has a
> "negative rake", I think it is called.

> How do I know just where the tool
> should be vertically when turning on a lathe? Should the tool touch the
> work exactly at the height of the center of the disk being cut? I suppose
> this is elementary, but I hack things out on a taig lathe when I need them,
> and I really do not know what is best.
> Thanks again.
>
> Tom Eldredge
> ----- Original Message -----
> From: Sven Peter, TAD S.A. <peteryco@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Saturday, April 28, 2001 12:10 AM
> Subject: Re: [CAD_CAM_EDM_DRO] Inserts R US
>
> Hello Jan,
> Befoer you start to use turning or milling inserts it is very
> important that you tune up your machine!!!!!!
> Adjust the gibs, the nuts and avoid vibrations.
> One point many people often do not check is the toolpost or carriage
> basement.
> Frequently it is worn on the base so that it can tilt and vibrate.
> Any vibration will damage your inserts.
>
> Another very important point is: If the insert is only 0.1mm of center it is
> in danger.
> Specially cut of inserts break their tips easily.
> I hope this is a helpful hint.
> Sven Peter
>
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