toolchanging

Hi Alvaro:
My VMC has an R8 collet permanently in the spindle and it works
amazingly well.
Z level repeatability is within 0.0002".
This system uses a pneumatic drawbar, though, so the clamping force is
consistent.
Morse tapers are not too good for Z level repeatability.
The taper is so slow, that minor diameter variations lead to big changes in
Z level. (ie pulling the drawbar a bit tighter)
Putting a collet chuck within an endmill holder will work, but it's not very
rigid, and it eats up a lot of your Z height.
Ideally, you want the cutter as close to the lower quill bearing as you can
get it.


Cheers

Marcus
-----Original Message-----
From: Alvaro Fogassa <fogassa@...>
To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
Date: Saturday, January 13, 2001 10:06 PM
Subject: [CAD_CAM_EDM_DRO] Just to change the subject

> I need to find a cheap way to do tool change on my grizzly and keep
>the same TLO for each tool every time there is a tool change.
> using the mt3 morse taper is just not working,I'm wondering if
>anyone knows a way to do this without having to change the spindle
>(from mt3 to r8)I've being thinking in keep a 3/4" end mill holder in
>the spindle and use several straight shank collets holders for that?
> any suggestions?
>
>fogassa.