Posted by Samuel Lindhorst at 1/22/2001 11:54 AM EST
Engineer on team #240, Mach Vee, from Jefferson High School and Visteon.
In Reply to: Joe's post
Posted by Ken Leung on 1/21/2001 8:54 PM EST:
: Joe Johnson posted it a while ago:
: -----------------------------------------------------
: The gear is a 12 tooth, 16 diametral pitch, 20 degree
: pressure angle, stub tooth.
: This gear can mate with a standard gear by either
: increasing the center distance a bit. This increases
: the backlash a bit too, but nothing too bad considering
: the typical FIRST robot. Another method is to shaft off
: .4/D.P. (in this case .4/16=.025"

the diameter of a
: standard gear. Alternatively, you can have a stub gear
: cut from legal kit materials.
: Joe J.
: P.S. Come to think about it, the last option is the
: only real option this year since, to my knowledge,
: mating gears (standard, stub or otherwise) are not sold
: by Small Parts and gears are not on the Additional
: Material List.
Thanks Ken. I'm begining to heartily dislike Small Parts as a sole source. I like their people, who are sweethearts on the phone and helpful, but the catalog just has too many tools, which I can get anywhere, and too few things I'm looking for. I think we should have available a gear to match every output pionion in the kit.
Well, now that there's no hope of finding a mating gear,I think it's easier to cut a sprocket to either fit over the gear, or cut the gear away and press on a sprocket. Or give up and use a van door motor...