Re: Z axis force

With the .1 lead on your acme it is aprox = to a .2 lead ballscrew
for force needed...And it didn't cost you anything...

with your setup, acme screw and .1 lead, and a 1000lbs. It takes
31.85 in-lb to move the table, this does not include acceleration.
And you have 25.6 lb-in x 2.5 reduction = 64 in-lb available.

So yes. i can see were this would work, your only limiting factor is
acceleration, after that it would be RPM. With 2500 RPM servo
and .1" lead and 2.5-1 belt. You should get 100 IPM rapid on your
knee...

Wally



--- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers <rogersmach@y...>
wrote:

>
>
> cnc_4_me <cnc4me@g...> wrote:
>
> I am getting posts mixed up...Tell me again, what machine do you

have

> and what weight are you saying knee is...
>
> Wally
>
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers
> wrote:
> > Its an acme screw on Z.
> >
> > cnc_4_me wrote:
> >

////I'm running a 100 volt 13.7 continual amps servo rated at 40 lb -
in
torque rating with a 64 VDC supply. Using the above calcualtion, I'm
only
getting 64% of the stated torque. Which is 25.6 lb-in. It drives the
Z at 60 ipm
just as Ajax claimed a 40 lb-in motor would at full voltage.
Calculations and
theories aside, it works. Remember,the knee table and vise weigh
approximately 800 lbs. then add a few hundred pounds force of a
drillbit
plunging steel. The little Gecko320 tolrates this, much to my
amazement. ///Ron> >

/// Also, The servo is 2500 RPM. 2500 X 64% = 1600 RPM divided by 10
revs per
inch on the Z axis = 160 divided by 2.5 belt reduction= 64 ipm.
Exactly, what I
can achieve. Ron///