On Tuesday 31 May 2016 00:46:40 MC Cason wrote: > Gene, > > On 05/30/2016 11:11 PM, Gene Heskett wrote: > > On Monday 30 May 2016 23:09:23 Chris Albertson wrote: > >> I would not make the belt so strong that the > >> next strongest part is expensive > > snip > > > 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 > > I probably missed it somewhere, but what is your center distance, > and the pitch of the pulleys that you have now? > > This is a calculator that I have used to play around with different > belt/pulley combinations to fit within the center distance > measurements on a rotary table I'm modding: > https://sdp-si.com/eStore/CenterDistanceDesigner > > Move your motor to it's limits in, and out, and measure it's center > distances. Then pick a point somewhere in the middle, and adjust the > numbers on the page, until the belt and pulleys fall within reasonable > sizes.
Thats the page I couldn't remember and aparently hadn't bookmarked, thank you. I don't know as I can get a good accurate center to center, too much stuff in the way to set a divider points and measure that, and not enough space beyond either end to get a dial caliper to it. But I'll mess with it later today & see how good a swag I can come up with. ATM, and assuming 4.0" C-C only 7 teeth are engaged on the small pulley, and raising it to 26 brings the 2/1 gear ratio down to 1.2 something with 12 teeth engaged. That should be a huge help. But I'll have to count teeth on the headstock pulley, I probably don't have it correct. 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
