On Monday 10 March 2014 20:28:53 John Kasunich did opine: > Gene: > > It seems like you're going about this the hard way. > > The first step is to identify the belt family. Look at the > shape of the teeth on the belt. Are they round, or > trapezoidal? Take a look at the pictures here: > http://www.sdp-si.com/D265/HTML/D265T015.html > > Given that your pitch is approximately 5mm or 0.2 > inches, likely candidates are XL (fig 19c, top row, > right end), or 5mm HTD (fig 19f, 2nd row, right end), > 5mm GT2 (fig 19i, 3rd row, right end), or T5 (fig 19k, > bottom row center). > > The tooth shape should let you eliminate two of the > four possibilities. It is either round (HTD or GT2) or > trapezoidal (XL or T5). > Definitely trapezoidal.
> Any markings on the pulleys that wound indicate > the type? GT2, HTD, etc? (That would make it > too easy.) No mark of that sort >POM< in one of the casting webs is it. > Assuming no markings, next step is to determine > the OD of the pulleys for each type. Google found > this page: > > http://www.pfeiferindustries.com/timing-belt-pulley-pitch-diameter-outsi > de-diameter-charts-i-12-l-en.html > > Links on that page lead to PDF files with pulley dimensions > for three of the belt types. It didn't have info for T5, but I > found another that did. I'll save you the reading - for 30 tooth > pulleys, the pitch diameters and outside diameters are: > > HTD: PD = 1.880" OD = 1.835" > GT2: PD = 1.880" OD = 1.835" > XL: PD = 1.910" OD = 1.890" > T5: PD = 1.880" OD = 1.848" Ok, what happens when the pulley OD is (across the teeth) 1.803" ? Plastic shrunk in its old age? Looks like pretty fresh casting to me. In some sort of black ABS? Thats a pretty good jump up to a T5. Thanks. Cheers, Gene -- "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> ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
