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One more reason to go with extrusion is than you can slide the pillow blocks for chain tension adjustment. We would have been in major trouble without that. Another substitute is an adjustable or sring loaded idler sprocket to use as a tensioner if extrusion is not used.
You can also do the same thing with square tube but you woyuld have to have slots milled.
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Teacher/Engineer/Machinist - Team 696 Circuit Breakers, 2011 - Present
Mentor/Engineer/Machinist, Team 968 RAWC, 2007-2010
Technical Mentor, Team 696 Circuit Breakers, 2005-2007
Student Mechanical Leader and Driver, Team 696 Circuit Breakers, 2002-2004
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