I'm a chemical engineer and dissolve all my problems! Besides that we designed a timing belt driven CNC machine and operate it happily. We use a belt on each side of the long axis and that is about 27 ft. belt length. The steel loaded urethane belts are tensioned and sound like a base string. It's used for wood working and is accurate to .005 according to our mitutoyu caliper. I am suer that there is flew during the cut, but it's still elastic and when all parts finally stop it's back to dead on. parts cut to fit into each other (concave/convex) are fitting perfectly. So the different cutting passes are not yielding different tolerances. If, then they are below our capability to measure them. The machines run now for 2 years under Mach3 without a belt related failure. Which cannot be said regarding the operator failures. All I can say.... those machines ARE rigid hahaha. Breaking a 3/4 inch carbide bit in plywood and surviving it requires strength... The machines Gantry is made out of 4x6 square steel tubing and the frame out of 4x4 square steel tubing. We use stepper. 1800Ounce/Inch. We don't know about a single step we missed ;))). Belts are fun, cheap, and precise for tasks with a certain accuracy requirement.
Any case.... a flex of .02 would be unacceptable for us. We do not see that kind of flex. It's really around 0.005 . The belts are european steel cable loaded AT5 belts 3/4 wide and driven on AL pulley's. Cheers Rainer ------------------------------------------------------------------------------ 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
