Chief Delphi sprockets

[archiver]

Posted by Patrick Dingle at 03/07/2001 3:17 PM EST


Coach on team #639, Red B^2, from Ithaca High School and Cornell University.


In Reply to: Re: Wire EDM for 150% of SPI Cost!
Posted by Raul on 03/07/2001 1:59 PM EST:



Being involved in FIRST for three years and playing a major role on the design of our robot this year, I like to think that I know a lot about machining. However, the truth is I am a computer science major. Can someone explain what a "wire EDM" is, and how it works? Also, how does the laser technique work? Sounds interesting.

Thanks
Patrick

: Ouch!

: I hope this does not make you feel bad - our shop charges $75/hr and we were able to get four 50-tooth sprockets for less than an hours work on a laser. But then the students clean up the parts by chamfering the edges on a sander and deburring on a wire wheel. Wire EDM is much more expensive (longer run time) than a laser for thin parts such as sprockets.

: My advice is to tell your shop to leave it rough and that you will clean it up yourself. This will always save you a considerable amount of money an it allows the students to actually participate in the fabrication of most parts.

: We attach (with screws) all sprockets to hub turned on a lathe.

: Raul