Thread: Bike Bobber
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Old 04-25-2014, 08:30 PM
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massdrive massdrive is offline
Motorized Bicycle Elite Member
Join Date: Oct 2013
Location: Las Vegas
Posts: 455
Default Re: Bike Bobber

Cupping the Brake Flange

Cupping the brake flange is critical. Without this the arm will simply twist and brake off of the flange. I cut out a small rectangle from the left over piece's of box tubing leaving the 1/8 radius. I slit the radius about every 1/4 in. and eyeballed it into position centered on the edge of the flange. As I tacked it together I tapped the heated metal around the flange with a hammer to form a cup. After tweaking the cup walls straight I finished welded both sides and than rough ground them.
Attached Images
File Type: jpg 11_cupping the flange.JPG (318.2 KB, 49 views)
File Type: jpg 12_ready to tack weld.JPG (191.9 KB, 67 views)
File Type: jpg 13_finished welded_outside.JPG (172.3 KB, 51 views)
File Type: jpg 14_finished welded_inside.JPG (162.1 KB, 46 views)
File Type: jpg 15_cup rough grind_inside.JPG (123.1 KB, 49 views)
If you have to force it there must be a better way
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