Re: [CAD_CAM_EDM_DRO] Timing Belts and Pulleys

Wayne Weedon wrote:

>Jon Elson wrote:
>
>
>>>
>>>
>>>
>>the pulleys will give an absolute 2:1 ratio over the long term.
>>Depending on
>>how accurately the hubs are bored, there may be some small cyclical error
>>every turn. That's why I always buy the pulleys with undersize bores and
>>bore them up to whatever size I need. I turn rings out of aluminum scrap
>>that have an exact ID to match the pulley's OD, then split the rings.
>>The OD
>>of the ring is not important, but I turn it on the same mounting so that the
>>ID and OD are perfectly concentric. I put these around the pulley when
>>mounting in the lathe, so the pulley is held very accurately concentric
>>to bore
>>the ID.
>>
>>
>>
>>
>
>Jon you need to make yourself some softjaws, much easier ;)
>
>

I'm not going to grind a set of jaws for one pulley, which may be all
I'm doing at
one time. The rings are quite easy to make, in many cases FASTER than jaw
grinding.

I have a Phase-II copy of the Buck adjustable chuck. It has a rather
fancy series
of slots and grooves on the replaceable top jaws, and it would take more
than a
few setups the replicate all that. Maybe a plain block of stock with
the right
holes would fit, but I'm not too sure.


Jon