On Wednesday 23 May 2018 11:42:55 andy pugh wrote: > On 23 May 2018 at 15:39, Gene Heskett <[email protected]> wrote: > > True Andy, but I haven't searched for teeny toothed belts to see > > whats available. The 10mm wide stuff I'm familiar with is so stiff > > that it takes 5 lbs of preload just to bend it around a 20 tooth > > pulley. > > There are 2.5mm pitch belts with 6mm pitch
You meant 6mm width I assume. Still lots more belt than needed. 3mm wide would be a great plenty, > https://uk.rs-online.com/web/p/timing-belts/4745050/ > > I used a 9mm HTD belt on my lathe spindle: > https://photos.app.goo.gl/MuZN8DOMyKCNkA8n2 > > Which is a very similar arrangement to what I am suggesting. Surely that lower pulley is not on the encoder shaft? I'd love to have that polygroove belt driving the sheldon's spindle. Lots less tension needed than with vbelts and worn sheaves from 70 years of slippage. I've a 2 groove sheave and two loooooooong 1/2" belts doing mine. Which aren't in that great a shape, someone replaced them once before and re-installed the lower sheave reversed on the shaft, but its a major project to replace them. Those, and the end-thrust bearings need replaced, I have about a thou of lengthwise motion due to wear in the thrust bearing races, or possibly dirt behind them. Thats also a right PITA to address. Since the spindle has to come out to do all that, along with with the top shaft of the lower drive, its best done all at the same time. And it takes 2 to handle that job. But they need to be smaller, more flexible people than I am because they've both got to work on their knees to get enough hands in the front door to do it. Fun it will not be. Thanks Andy. -- 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> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
