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Wire Burned Sprockets
Posted by Michael Ciavaglia at 03/07/2001 8:43 AM EST
Engineer on team #47, Chief Delphi, from Pontiac Central High School and Delphi Interior Systems.
In Reply to: Chief Delphi sprockets
Posted by Patrick Dingle on 03/04/2001 9:41 PM EST:
Patrick,
Thanks for noticing our sprockets!
We were forced to wire burn 1/4" and 3/8" pitch sprockets. We bought the steel sprockets from SPI and continued accordingly (i.e. steel shafts & welding). I can't remember exactly when we weighed CD6 but when we did we were about 138#. We had to go on a diet!!
That's when we had to make the aluminum sprockets. The next problem was, how do we attach aluminum sprockets to steel shafts?
We took a hollow steel tube and plugged the ends. Then we took 1.5" dia steel, bored out the center and put a chamfer on the hole for the weld to go somewhere. Then we faced off the weld so the sprocket would mate flush to the slug. Finally, we drilled and tapped the steel so we could screw the aluminum sprocket to the shaft.
Initially I shyed away from this because of cost. However, I found a source that would produce them at a few dollars more than I could get sprockets from SPI.
Why did FIRST change the rule this year on sprockets, gears, and pulleys? I loved last year's rule!!
Does anybody know why they changed the rule back?
Mike C.
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