I have now destroyed the third lower timing pulley and belt on this lathe.
I hope someone can give me a knowledgable answer. This timing belt is of a profile that dates back to the 60's or 70's, and both the pulleys and the belt are only available from the Chinese maker of the original 7x12. I can get them yet from LMS. However its turning into a PITA. This thing is rated as a 7" swing, meaning it should have the cajones to work on a 3.5" diameter steel round. Even with my newer motor, its not able to move the horsepower to do a steel round in excess of 1.5", destroying the lower pulley and belt if a cut of more than 5 thou deep and feed rate is being done. I had a session day before yesterday of the back gear countershaft squawling pretty bad, so I called Chris at LMS and bought the whole headstock for a $132 bill with USPS shipping, and which arrived today. Thats a huge disappointment, the bottom of the casting is wide open, eg zero chance of retaining an oil bath among the spinning gears, AND one of the only 3 mounting bolts holes is smack on the V-way, with raised burrs from the tap needing leveled off so it will hopefully sit solid on the V-way. I am contemplating milling a ledge inside the bottom of it and dropping a fitted 1/8" alu plate, gooped to the ledge so it will hold some oil. If I put the $50 metal gearset (in the next paragraph) in it, some oil splashed on the teeth should prolong their life. I see he also has a set of steel gears for it for another $50. I would probably need them if I could figure out how to get the power this motor can output, into the countershaft of the head. So, compared to a timing belt (not actually needed, my encoder is on the load side of any slippage), the space for the input pulley is restricted to something just under 2" in diameter, how would the smallest 5 groove 12.7mm wide pulley/belt combo compare in terms of how much power it could move, when compared to the just barely above the KT boundary tooth profile the OEM pulleys and 10mm wide belts can move? Thanks guys. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ 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
