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Module and DP gears

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Steve Bell 1	17/11/2009 22:14:36
5 forum posts	I have a Leinen lathe that uses 1.25 module change wheels for screw cutting. I would like to cut some gears that I need but am unable to find anywhere that sells a 1.25 module cutter at a reasonable price (tried Chronos, RDG, Tracy Tools, Arc Euro and generally looking on the internet). I only need a couple of cutters for gears with higher number of teeth, upwards of 55. Couple of questions 1. Anyone know where to get the cutters? 2. Anyone have experience of running 20 DP gears with 1.25 module ones? From my working out on a gear with a PDM of 150mm and 120 teeth that I have, it is 20.3DP, and a 6" gear with 120 teeth would have a module of 1.27 by my reckoning. Since 20DP cutters are fairly cheap I was going to make 20DP gears and go with the slight error as the gear ratios will still be the same, just wondered what other thoughts were? Thanks Steve
John Stevenson	17/11/2009 23:14:44
5068 forum posts 3 photos	Steve, the Micron gear hobber also used 1.25 Mod and many owners use Myford wheels at 20 DP. Possibly some other users will chime in. John S.
Ian S C	18/11/2009 11:43:21
7468 forum posts 230 photos	I ground up a tool and used a fly cutter if thats any help.IAN S C
Nigel McBurney 1	24/11/2009 22:17:12
1101 forum posts 3 photos	hi I get involved in making timing gears for stationary engines and on a couple of occasions have used DP cutters for magneto gears on french engines,and they have run ok with no ill effects,screw cutting gears run so slow that you will have no problem and they will not be used very often,a very close matching dp cutter will make a better gear than attempting to make a fly cutter,after all a set of gear cutters are only a compromise,each cutter covers a range of gear sizes nmcb

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