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Old 04-15-12, 12:54 PM   #1
calstar 
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Why tap the blades after coldset?

Why does Nagasawa hit the fork blades after cold setting?

http://www.youtube.com/watch?v=q7VGz...UGA&lf=channel


thanks, Brian
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Old 04-15-12, 02:03 PM   #2
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To relieve stress?

No, seriously. To relieve any residual stress it the fork blade after bending, not his stress of course....

Last edited by Stealthammer; 04-15-12 at 02:06 PM.
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Old 04-15-12, 06:36 PM   #3
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The interesting thing is the hammer looks to be a rubber/plastic headed one. Not too much impact from those... At first thought it was to remove the side ways bulge from the bending (on a form without too much side of tube support) but one blade is hit in line with the bending, the other blade is sideways to the bend. Andy.
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Old 04-15-12, 08:00 PM   #4
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sure looks like he's hitting it in the direction of un-raking to me. I have no idea why, probably something someone taught him
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Old 04-15-12, 09:17 PM   #5
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Originally Posted by unterhausen View Post
..... I have no idea why, probably something someone taught him
Looks like a large rubber mallet(also no ring when he hits it, the vid should pick it up if metal), unlikely to remove any stress with a couple of minor hits like he uses(not to mention the force needed to bend them in the first place). So....probably something someone taught him and who knows what its for, maybe a tradition he follows.

thanks, Brian
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Old 04-15-12, 11:07 PM   #6
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too bad they didn't ask. I would think it probably bends the blades back a little. Not gonna try it though.
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Old 04-16-12, 02:24 AM   #7
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I don't know why he does it but I always try to over-bend tube and un-bend it to get a perfect radius that will last. I have only raked two fork legs however and they were already in a fork. I do not strike the parts as the back wall is stretched thin.
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