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). Any markings on the pulleys that wound indicate the type? GT2, HTD, etc? (That would make it too easy.) 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-outside-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" So, if it is trapezoidal, you can tell the difference between XL and T5 by measuring the pulley OD. 1.890" vs 1.848" should be easy to tell apart, even with manufacturing tolerances. If it is round-toothed, things are tougher. Both the PD and OD of HTD5 and GT2-5mm are the same. The tooth profiles are close enough that you could probably make do with either belt - get whichever one is easier to find. Once you know what type of belt you need, come back and we can help you find a source. If it is XL, you probably want 3/8" wide, and you can get them lots of places. The other types might be harder to find. On Mon, Mar 10, 2014, at 06:36 PM, Gene Heskett wrote: > On Monday 10 March 2014 18:33:35 Brian Morel did opine: > > > Yes, the Pitch Dia. is greater than the OD of the sprocket. take a look > > at the below link. > > > > http://www.brecoflex.com/index.php?CATID=7&SCATID=44 > > > Looks good, till I tried to use the belt selector, my browser or their web > page is broken as everytime I try to enter a value, it clears all other > selections made except the width. So I can't select a 5mm pitch, 9,5mm > wide, 72 cog belt. > > Thanks Brian. > > 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 -- John Kasunich jmkasun...@fastmail.fm ------------------------------------------------------------------------------ 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
