Re: [CAD_CAM_EDM_DRO] Inserts R US

Thank you Sven Peter, for your helpful comments.

Since I posted, a tool dealer told me not to use a negative rake insert, but
I had already purchased this one, and the tool holder. I will have to get
another, I guess. It does not do too bad, however, so I will get one when I
can.

Anyhow, thanks for your help. I will put your advice to work.

Tom E.

----- Original Message -----
From: Sven Peter, TAD S.A. <peteryco@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, May 08, 2001 10:51 AM
Subject: 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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>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
discussion of shop built systems, for CAD, CAM, EDM, and DRO.
>
> Addresses:
> Post message: CAD_CAM_EDM_DRO@yahoogroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
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> bill,
> List Manager
>
> FAQ: http://www.ktmarketing.com/faq.html
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