I just ran the numbers and for the dimensions you gave the belt length is almost exactly 375mm. For those sizes I'd use a HTD toothed belt. Pulleys are fairly cheap and belts are easily available in wide range of sizes.
It is a pity your belt is so short. Automotive poly-V belts are available in roughly 5mm increments from 600mm upwards, widths from 3 to 8 ribs. Just for reference the part numbers for PK series poly-V belts are easy to work out. For instance a 3PK0750 belt would be 3 rib, 750mm pitch circumference (cut length). Les > Blink! That may well be the key translation to that acronym Mark, in > which case an 8" OC would be way too short. I might have to rethink how > I go about determining it. My thoughts up to now have been using > nominally 1/2 the circumference as the belt wrap distance for the amount > of belt actually in contact with the pulley's and 2x the intershaft > spacing as a SWAG to be used for length. > > If the larger pulley is 70mm, thats nominally 110mm of wrap, and the > smaller pulley is 40mm, thats 62mm of belt wrapped, and the shafts are > 100mm apart, I'd have 110+62+200=372 to 380mm of belt needed. The > dis-similar sizes will of course give more wrap length on the larger > pulley and less on tha smaller pulley, so to be dead on I'd better look > it up in the Handbook. OTOH, thats what the pivoting motor mount is for > anyway. :) > > So a 15" OC belt would be in the ballpark. But I'd best get the pulleys > made first, if I can determine the rib spacing. I'd love to put the > motor behind the spindle, but that would intersect with the Z drive > bolt, so it will need to remain as a sideways offset. All that of > course is TBD. ;-) > > Cheers, Gene Heskett ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
