Gallery, Projects and General > How to's
Cutting Spur Gears -- A neat technique
xo18thfa:
Thanks for the kind words.
Here are the best pics I could get with this camera. Holding these gears up to the light with a commercial gear shows they are pretty close. You can see the flat cuts of the "approximate involute" but it does not seem to affect the performance. I have a set of these in a "Cracker" loco that's been run hard and no appearance of wear.
I like this method. Going to try 32 DP gear next.
The dividing head is Harold Hall's design. It has a #2 Morse Taper spindle which is not a good idea. Morse Tapers do not quick release. They go in tight and need a hammer blow on the draw bar to loosen. I have a set of castings for George Thomas' "Versatile Dividing Head". Going to set that one up with a straight shank ER-25 collet. I think that will work better. It will also be direct dividing with change gears or plates.
awemawson:
Very nicely done :thumbup:
I'm tempted to have a try just for the fun of it despite not at the moment needing any gears.
Biggles:
Propar Job! :)
sparky961:
Again, very nice. I'm in the same boat as others though... don't need any gears at the moment.
seacat:
Bob, very nice gears and a very nice application you have made for them. A very useful method of gear making which I have noted down - I have some gears to make sometime soon including an internal gear and this looks like solving the problem of the making of the spur gears at least.
Yes, I can see that the gears have a series of straight lines on the teeth - had the been steel gears I would have suggested you make a "running in board", where the gears are mounted on spindles on a temporary board and one gear driven to drive the rest and run for ten minutes or so with grinding paste to grind the gears into one another, which would take off the rough edges, such as they are, not very rough really. But being brass this would not work as the grinding paste would only inbed itself into the brass for every more. Perhaps if they are run with plenty of lub they will bed themselves in, if you are worried about it. Not sure I would be much!
Chris
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