> Message: 1 > Date: Tue, 12 May 2009 14:21:33 -0400 > From: Douglas Pollard <dougp...@verizon.net> > Subject: Re: [Emc-users] Gear Tooth Profile > To: "Enhanced Machine Controller (EMC)" >
> Kirk Wallace wrote: > >> On Sat, 2009-05-09 at 11:45 -0700, Kirk Wallace wrote: >> >> >>> I would like to make gears, but I need to know the tooth shape in order >>> to make a form tool or cut an outline. This is what I came up with, if >>> there are any mistakes or bad assumptions, please let me know. >> ... snip >> > My 1974, 19th Edition, Machinerys handbook, has British metric > standards but they may be different. Their threads are. Seems everyone > wanted to go metric, but they just wanted their own metric standards. > The (1992) 24th Edition of Machinery Handbook does not have Metric tables. Maybe you should ask someone who has a 28th edition if the metric tables are in that 28th edition? The 1987 version of "Technology of Machine Tools", (Canadian Edition), has a table of metric threads on page 215. 1. The flat at the bottom of the metric thread is twice the flat at the top of the thread. (I am reading this off the rack form of the metric thread). 2. The depth of thread, (D), is 0.6134 times the pitch, (P). The metric thread root is described as thicker, which gives more strength. The 60 degree include angle sounds easy to make a forming tool. Ummm. I suspect you have more Machinery Handbook, local, and email support for American Standard threads. Just before the gear cutting stuff in the 24th Edition, there is a section on cutting racks on milling machines. James Isaac. ------------------------------------------------------------------------------ The NEW KODAK i700 Series Scanners deliver under ANY circumstances! Your production scanning environment may not be a perfect world - but thanks to Kodak, there's a perfect scanner to get the job done! With the NEW KODAK i700 Series Scanner you'll get full speed at 300 dpi even with all image processing features enabled. http://p.sf.net/sfu/kodak-com _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
