Re: BOSS to servo's and reduction

I am going to go with the boring route first. We'll see what happens.
I like the drill and ream idea but I am not sure I can get the proper
accuracy. The holes in these pulleys tend to be a bit off to begin
with don't they? I would bore in my lathe but if I get flanges on
the small pulley they will put a damper on that idea. Do you know
if the flanges are a good idea on such a small pulley? Or can I
get away without them with very careful alignment?

Thanks,

Scott


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

>
> I think it would be fine even if the wall wound up being as little

as 1/8". Use like a 3/16" roll pin. Drill and ream the pulley
concentric to the OD. 12.5 lb-in just isnt alot of torque but you
have the RPM to reduce to make up for it at the screw. Especially for
X and Y, they just dont require a whole lot of torque. Think about how
much force is applied when machining manually. All three motor pullies
on mine are secured with roll pins and these are 40 lb-in servos and
one driving the knee. I wouldn't have opted for this because in
tooling practice it's pretty unorthodox except thats how they were
originally secured on the steppers and they worked intermittently :-)
like that for over twenty years. (The original owners spent a small
fortune on that old control, I located the repairman that they used
after I bought the machine and he was happy to find out where it went
at $85 an hour) I just installed them on the servos the same way. Its
easy, just locate the pulley, drill a hole

> and drive a pin in it, it isn't going anywhere and the pin

eliminates any backlash providing the pulley fits the shaft well.

>