Re: unimat classic

"Wayne Bengtsson" <wbbengtsson@g...> wrote:

> Hello:
> As far as connecting steppers to smaller machines, one idea I had

was to use short lengths of flexible shafting. I have no idea if this
has been done before, or if it is even practical. Bad things include
the flexible shaft torquing, increasing backlash effect. On the plus
side, with the motors remotely mounted, you don't have to shift their
mass.>

Thanks Wayne. I think I'll try to find some flexible shafting that
might be usable for this purpose. Maybe the Dremel flexible shaft.

Below is the post I composed before I read your post. Anyway, here
goes:

Unimat I (Unimat Classic)

WORKTABLE (Y-axis)

SIDE VIEW

|<------50mm-------->|

---------- ---------- -
| _|..|_ | 16mm
|_______. 0 ._______| _
....

handwheel 29mm

FRONT VIEW ....(hidden lines)
____________________
__-- | ..................
|__ \__| .
| ...| ./\ /\ / approx 1mm pitch threaded rod
| __|_.__\/__\/_
| / |_.
--
handwheel
outer diameter: ~29mm D-shaped
inner diameter: ~18mm with set-screw
hollow shaft outer diameter: ~8mm
hollow shaft inner diameter: ~4mm (for threaded rod)

Hoping for some ideas on how to attach a stepper to the Unimat I. The
easiest I can think of is replacing the handwheel (unfortunately D-
shaped) with a geared wheel to be driven with a belt connected to a
stepper mounted on a plate riveted to the worktable.Where might such
a geared wheel be available - SDP-SI?

Maybe saw off the handle and glue/screw on a toothed wheel direct.
What may happen if the centers are not concentric? Perhaps this is
not critical as all that may happen is the belt just move "up-and-
down" and "left-and-right" with small changes in the tension?

FRONT VIEW ....(hidden lines)
____________________
-- | ..................
~~| \__| .
/\| ...| ./\ /\ / approx 1mm pitch threaded rod
||| __|_.__\/__\/_
\/| / |_.
~~ --
handwheel


~~ toothed belt
/\
|| toothed wheel
\/
~~ toothed belt



Is Nema 17 small enough for a dwarf like this one, or would I need
something even smaller?
Any possibility for a direct drive with a properly sized motor/mount?

Photos of the Unimat Classic can be seen at

http://www.maxmax.com/fMini-mate.htm

http://www.unimat.at/d_s_unim.htm

"Optional können mit dem breiten Zubehörprogramm noch unzählige
weitere Werkzeugmaschinen konstruiert werden:"

What does that mean?

Thanks Peter