Re: [CAD_CAM_EDM_DRO] Re: BOSS to servo's and reduction

The ones I'm using have a flange on the small pulley only that keeps the belt on both. I think as least one pulley has to have them. If the original bore is off center it will have to be bored concentric before drilling or the bit as you know will just follow it. I havent ran into that as I use Martin pullies and they are concentric to begin with. To hold in the lathe a sleeve could be machined with the ID to match the OD pulley teeth portion and the OD of the sleeve a bit larger than the flange. Then just split the sleeve in two pieces and use it to hold the pulley in the chuck.

Ron

Polaraligned <polaraligned@...> wrote:


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 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.

>

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