pic: 499_Toltech_drivetrain

[Kevin Sevcik]

Originally Posted by Hachiban VIII

According to Inventor 1 foot of 8020-1020 is 0.9289 lbs. and 1 foot of 1x2 1/8" wall extrusion is 0.8077 lbs. In otherwords if you replaced your two 8020 rails with boxed extrusion you would save 0.748 lbs. Big deal.

Ah, but he's using 1530-Lite which, despite the name, weighs in at a whopping 2.012 lbs/ft. 1/8" wall 1.5x3" would run 1.339. I'm questioning the necessity of a 1530 profile here, unless you're planning for your robot to be rammed by a small car. I think 1020 with a cross brace or two would be plenty strong and would save you at least 6 lbs. If you're really hankering for that 3" height, then 1030 weighs in at 1.350 lbs/ft and would still save a few pounds.