> From: andy pugh [mailto:bodge...@gmail.com]
> On Sun, 7 Feb 2021 at 20:10, <ken.stra...@gmail.com> wrote:
>
> > Perhaps using a collet results in more variability of tool lengths compared
> > to an R8 alone. However, I doubt that either way is reproducible to less
> > than several thou.
>
> The whole class of 7/24 tapers rely on pulling back to the same place
> every time. A solid R8 should be just as good, the taper angle is the
> same to within less than half a degree.
>
I still have to use the R8 for somethings like the floating tap holder, Face
mill, larger than 1/4" drill chuck but I do find most of what I do is done with
the TT type tooling. Either the early ones that didn't have the tool changer
slot in them or far east ones with a narrower shoulder that would require
modifications for a tool changer.
The other issue I have with R8 is that some of the tooling allows the straight
section to slide smoothly into the upper part of the spindle. Other R8 holders
barely fit. I'm not sure if the spindle is out of spec or tooling since they
all have the same dimension when I measure them with a micrometer.
So that also makes the TT stuff nicer to use.
John
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