Re: servo motors for BP clone

Just for comparison, stock BOSS steppers are 800 oz-in. Bridgeport
used these in a 1:1 and a 2:1 setup. The actual torque produced
by these BOSS steppers is about half of that rating, 400 oz-in.
(because they were not microstepped).
I have the BOSS 1:1 ratio setup and it has plenty of power.
So this produces 400 oz-in at the leadscrew. I may retrofit with
Baldor 200 oz-in continuous servos I have. So If I go 2:1, I have
the same torque as my setup has now. If I go 4:1 I have the same
torque as the later BOSS machines.
Centroid sells a BOSS bolt on retrofit kit that uses 29 in-lb servos
and they boast that it has more than twice the power of the original
steppers. I don't know that this is really necessary. Taking cuts
with all that power may just be beating the @%^t out of the machine.
I am with Jon, you don't need monster servos unless you are using
the machine in a production environment and making heavy cuts all
day. Geckos can't drive the big servos at full power anyway so
it may be just a waste of money.



Scott

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Zafar Salam" <zafar@z...> wrote:
> Hi,
>
> After running my BP clone on steppers and acme screws for 6 months,
I've decided to upgrade to ball screws and servos. What size motors
would be suitable for that purpose. I'll go with geckos and turbocnc.
I would appreciate help from anyone who has alread done that as this
would be my first experience with servo motors and drives.
>
> Zafar
>
> [Non-text portions of this message have been removed]