Re: True 4 axis

At 01:22 PM 6/10/01 -0700, William Reidsema wrote:

>if the Y axis moved to compensate for the circle
>elongation, one could mill a perfect raised circle on
>a rod that is turning in the rotary axis.

I don't follow "perfect raised circle", William. Do you mean "perfect"
when looking at a side view of the rod, or "perfect" as if the rod was used
as a rolling die and the resultant impression viewed?

You don't need a rotary axis for the former at all, just X-Y-Z. The circle
will be perfectly round when viewed down the Z axis, and the sidewalls will
be also parallel to the Z axis.

You don't need the Y axis for the latter at all, just X-Z-A. The
impression in the material will be perfectly round and the sidewalls of the
impression will be vertical.

In Solidworks I can project a sketched circle onto a cylinder, or I can
take a flat sketch of a cirle and wrap it into a cylinder. The results
will be different but each circle will be round when viewed the right way.
If you could upload a solid model of what you're talking about it would
help my little gray cells... :-)

Best regards,

Randy

Randy Gordon-Gilmore ,----.___________ ______________ _________________
ProtoTrains // = = === == || == == == = || == == == = == =|
Rio Vista, CA, USA /-O==O------------o==o------------o==o-----------o==o-'
zephyrus@... http://www.rickadee.net/~zephyrus