On Monday 30 May 2016 23:09:23 Chris Albertson wrote: > Eventually something will again jam in the lathe and stop the spindle > again. When that happens what part would you prefer to break? I'm > guessing you'd prefer a broken $4 belt
Good point, but belt isn't a quick change item. An hour or so I'd guess. > to a broken gear That might be a stripped key= new shaft and pulley I expect. And way more than an hour. > or burned out > driver electronics. That is one of Jon's (Pico Systems) PWM-Servo amps, at full rated 9.5 amps of power to that motor, it has enough left over to drive another just like it. The PSU's don't but thats my problem, I built them. Either psu would begin to heat its iron at about 1.5kw CCS loading. Probably 2.5kw ICAS for half an hour or so. I have two of those servo amps I am driving 1 hp rated PMDC spindles with & would say that if they are properly configured for current limit, are safe at least until you want to try to see if they are bulletproof with real bullets from a deer rifle. Anything else, just bring it on. > I would not make the belt so strong that the > next strongest part is expensive Still a good point but I believe the rest of the drive stuff could handle 50% more delivered torque to the chuck, considering that adding cogs to the lower pulley would reduce the pull on the belt as the pulley radius rises, and put more cogs in contact with the belt at the same time. It would also be a good excuse to make a new countershaft that is a full 1/2" at the lower pulley's hub, strengthening that considerably from its current 10mm diameter. The rest of the plastic headstock gearset is now metal too. I haven't ordered anything yet, I looked at the white si rubber belt on the M-Carr site, but I can buy 5 of the kevlar backed neoprene ones for the price of one of those. But that doesn't answer how much bigger I need to make the lower pulley in terms of its cog count if I get the 75 cog belt instead of the 65 cog belt. If I added 10 cogs to the belt, how many more cogs do I add to the lower pulley to maintain the current center to center spacing? Thanks Chris. 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> ------------------------------------------------------------------------------ What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports. https://ad.doubleclick.net/ddm/clk/305295220;132659582;e _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
