Posted by Jim Pollock on April 24, 2012 at 11:26:51:
In Reply to: Re: first helical gear posted by BillS on April 24, 2012 at 10:31:35:
Thanks for another one of your wonderful posts. I really appreciate your time helping me out.
What I saw on my cutter grinder was real close to 32 degrees of rotation in 1" of x travel but would this actually corespond to the helix angle or the lead angle? Also I am not positive that the gear tooth was actually resting on the finger at the exact pitch diameter of the gear. I was just guestimating on that. So you may be very correct that the angle is actually 32.82. Would the fact that this gear was cut on a gear shaper shed any light on it? In other words would it be possible or probable for John Deere to have had a shaper cutter with that helix angle? Sorry but my knowledge of gear shapers is even less than my knowledge of hobbers.
I realize that my list of change gears is very lacking because I usually only cut spur gears from about 26 to 40 teeth and a few odds and ends. I am willing to make or buy the change gears that I need as this gear will be something I will probably make more of in the future. It is slow but I can make any change gear that I might need on my mill using my dividing head. The dividing head will cut any number of teeth although I realize the milled gears will be less accurate than a hobbed gear. Here is my list of gears.
28 to 39 except 32
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