On Mon, 08 Jun 2009 16:25:32 -0400, you wrote:
>> What belt stretch? Once they are adjusted up, that's it. > >When using a belt to transfer rotary motion from one pulley to another, >belt stretch is usually negligible. That is very much NOT the case when >using a toothed belt to convert rotary motion to linear motion. > >> Timing belts have steel strands in them, to add strength and ensure they >> don't stretch. > >Everything stretches, including steel. Perhaps I should clarify. A toothed belt, installed and adjusted correctly, and used within it's design criteria and load won't stretch further within its normal lifetime (for HTD 8-10,000 hrs) . What's often referred to as "best stretch" is actually wear and erosion of the teeth and inner surface. It's usually caused by poorly designed/worn pulleys or misalignment. Belt erosion is much less prevalent on rounded tooth type forms. MXL, XL, L, H, XH, XXH and T types are the worse types for both wear and accuracy, HTD better and GT or GT2 the best. Steve Blackmore -- ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
