> -----Original Message-----
> From: Gregg Eshelman via Emc-users [mailto:emc-
> [email protected]]
> Sent: Friday, April 19, 2019 3:23 AM
> To: Enhanced Machine Controller (EMC)
> Cc: Gregg Eshelman
> Subject: Re: [Emc-users] ER ATC tool idea
>
> Set screw tool holder accuracy is down to how precisely the holders are
> made.
> A lightly oiled tool should pop when pulled out of the holder. Where this
> type
> of holder doesn't do as well as a collet is in heavy production work. They
> need
> to be monitored for getting bellmouthed. A precision rod inserted into a
> holder in a machine spindle should ideally have zero radial movement at the
> end of the holder.
>
> I wonder if any company machines set screw holders with the tool hole very
> slightly offset towards the set screw side so that the screw pushes the tool
> to
> perfect center?
I suspect that many are bored with the centre hole offset towards the screw.
Unfortunately it is equally likely that they are bored with the hole offset to
the side or away from the screw!
Seriously, Weldon shanks work great in larger sizes (say 3/8 and up). With HSS
shanks that are not fully hardened the setscrew gets a good grip. However,
with small (1/8 or smaller shank) carbide cutters they are not so good. There
is also the issue of imbalance due to the setscrew. This becomes important at
speeds above 10000 rpm. Tormach puts a small dimple opposite the setscrew to
partially compensate.
_______________________________________________
Emc-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/emc-users
