On Tuesday 31 May 2016 01:19:54 Gregg Eshelman wrote: > Replace both cogs and the belt with the stronger GT style, and also > choose a wider belt. (Nevermind that I went with XL on my 9x20 > leadscrew drive mainly because I already had a 22 tooth cog that fit > the motor, and found a dirt cheap 44 tooth cog on jet.com ) > > Somewhere on the web are calculators where you plug in the belt style, > center distance and drive ratio then it spits out belts and pulleys > that will fit (or at least come close) to what will fit.
Working it sort of bass ackwards, the spacing has to be in the 4.0" territory for a 16 to 32 tooth XL drive to use a 65 tooth belt. I can't up the size of the upper pulley as theres no clearance for an increase between it and the spindle itself. I was surprised to see the belt only go to 70 from 65 by just changing the lower pulley from 16 to 26, which put 5 more cogs in mesh on the lower pulley, going from 7 to 12. Since I can source those pulleys from fleabay for under a tenner a copy, I'll get a 5 pack of the 140XL037 belts and a 3 pack of the pulleys since I'll have to bore to suit, and make a fresh countershaft out of some .500" A2 rod I bought for this in the first place several years ago. I've nearly 3 feet of it left. The 3 pack of pulleys is so I can pick the one with the least runout. fleabay pulley's are a bit famous around here for excess runout, I have one of the 16 toothers laying around thats about 1/16th inch off center. Timing belts do NOT well tolerate that. > For my > leadscrew drive I had the center distance a bit off at 77mm. Thought I > was going to need an idler (no prob since I have a couple of small XL > pulleys) but the fit ended up perfect, have to install both pulleys > and belt simultaneously. > > Of course I planned it that way... > Sure you did. ;-) Ya just gotta luv it when a plan works better than planned. And if you've got papered (EE) frogs watching & telling you it will never work, but it is when you step back, the grin is even bigger. BTDT. > From: Gene Heskett <ghesk...@shentel.net> > To: emc-users@lists.sourceforge.net > Sent: Monday, May 30, 2016 7:14 PM > Subject: [Emc-users] drive belt for 7x12 NOT OEM > > Hi all; > > For want of a better project to keep me out of the bars tonight, I > went out and extracted the stripped belt off the toy lathe just now, > find it well labeled as a 130XL037, 3/8" wide, 65 tooth belt. It > appears that I had already replaced the ultra teeny drive pulley that > stripped the last belt easily had already been replaced with a 15 > tooth model. So even with about 7 cogs fully engaged, this motor > still had the cojones to strip the teeth off the belt. > > ---------------------------------------------------------------------- >-------- 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 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
