Mill Taper "40": ISO-40 vs. CAT-40 vs. CT-40 vs. BT-40 ???

[DDoerschuk]

I've got a two-part question for the group, if I may:

One of the common tapers for millers is frequently identified by only
an integer: "20", "40", "50", and "60" are progressively larger sizes
of this taper. I'm buying a Fritz-Werner FV-2 that uses a 40. I want
to buy some tooling for it, and I'm confused by the variety of tool
holders available for sale. Here's a list of what I've seen so far:

ISO-40
CAT-40
CT-40
BT-40

Would someone be kind enough to explain the difference to me?

The second part of my question is: has anyone seen a 40 taper adapter
that adapts down to an R-8? I'm not sure how such an adapter would
work, since both the 40 and the R-8 have threads at the top, but
someone out there probably has a clever device!

Thanks very much for the help

Dave Doerschuk
***@attREMOVE.net
Take out the: "REMOVE" characters in the above email address.

[Steve Lusardi]

In the US the drawbar tread size 5/8-11 NC for ISO 40 and CAT 40. The
drawbar thread for R8 is 7/16-20 NF. The adaptor requires a 7/16-20 drawbar
pulling through the ISO 40 taper, clamping both in place. If your machine is
not CNC, the taper would be ISO not CAT.
Steve

Post by DDoerschuk
One of the common tapers for millers is frequently identified by only
an integer: "20", "40", "50", and "60" are progressively larger sizes
of this taper. I'm buying a Fritz-Werner FV-2 that uses a 40. I want
to buy some tooling for it, and I'm confused by the variety of tool
ISO-40
CAT-40
CT-40
BT-40
Would someone be kind enough to explain the difference to me?
The second part of my question is: has anyone seen a 40 taper adapter
that adapts down to an R-8? I'm not sure how such an adapter would
work, since both the 40 and the R-8 have threads at the top, but
someone out there probably has a clever device!
Thanks very much for the help
Dave Doerschuk
Take out the: "REMOVE" characters in the above email address.