Thread: roll pin into output shaft
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Unread 12-01-2008, 17:38
OSU_Springer OSU_Springer is offline
Babcock & Wilcox - Engineer
AKA: Bill Springer
FRC #0677 (Murphy's Outlaws)
Team Role: Engineer
  
Join Date: Jan 2008
Rookie Year: 2007
Location: Columbus, Ohio
Posts: 10
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Re: roll pin into output shaft
Part of the problem is that the roll pin is .100 (or thereabouts), and the shaft hole is about .080. Now the BOM for the Toughbox states that roll pins are 3/32". That correlates to .09375. So firstly, the Roll Pins are oversized from the appropriate dimensions. Secondly, the holes are undersized from a proper tolerance perspective of an interference fit with those materials. A proper fit for a split or spring type pin should only interfere a few thousandths, not 15-20 thousandths. Another reason to doubt the quality control folks.