Re: Z axis force

OK..using new number of 1200lbs instead of 1000 i used in last post
you need 38.2 in-lb to move table and you have 64 in-lb available.

Wally



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

> Wally, Its a 9 X 42 series 1. It requires 10 revs of the input

shaft to raise the table 1" . Acording to Bridgeport mfg., the table,
saddle and knee weigh 750 lbs +75 lb vise=825+ all three servos and
mounts 100 lbs=925 +estimated drill loading (dull bit) of 200
lbs=1125lbs. Factor in resistance in screw of at least 50lbs.=
1175lbs + resistance in the dovetail at least 25lbs= 1200 lbs. Those
are good numbers.

>
> I'll try to calculate this, it's probably wrong:
> 3.5" dia pulley mounted on Z shaft with a 10.99" circumference.

10.99"/.100"linear travel per rev =109.9:1 reduction. Each pound of
force on a 1.75" radius from the shaft would = 1.75 lbs rotational
force. 1.75X109.9=192.3 lbs lifted. 1200lbs/192.3=6.24 in lb required
to just equal the weight of the table. Divide the 6.24lbs/2.5
ratio=2.496 lb-in required from the servo to even begin to move it.
Now it has to be accelerated to 60 ipm. Which on mine is less than a
second.

>
> Ron
> 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:
> >
> > /// 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///
> >
> >
> > Do you have a ballscrew or a acme screw.
> >
> > Wally
>
>
>
>
>
>
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