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Originally Posted by Brian Ratliff
(Post 12166211)
This is what happens when you blindly use a torque wrench:
And BTW, you're every bit as likely to have the same result as your picture employing "feel" and doing it in the same sequence. But you're a lot more likely to crack a component doing it by feel if you're ham fisted, than with a torque wrench. |
Originally Posted by Racer Ex
(Post 12166280)
Improper use of a tool does not make the tool less worthwhile. People cut their fingers off with powersaws; by your reasoning people should use a hand saw or call a carpenter.
In this case, a guy with a powersaw probably knows how to use a handsaw as well. Knows how to manipulate the wood piece; knows how the cuts can close up and bind the blade if you don't support the piece correctly, etc. And if you were scared of cutting wood with the handsaw, then yes, you should probably call a carpenter instead of picking up the power saw. Just saying: an idiot (in the shop) with an allen key doesn't turn into a shop master when you put a torque wrench in his hands. |
Originally Posted by Racer Ex
(Post 12166280)
Improper use of a toll does not make the tool less worthwhile. People cut their fingers off with powersaws; by your reasoning people should use a hand saw or call a carpenter.
And BTW, you're every bit as likely to have the same result as your picture employing "feel" and doing it in the same sequence. But you're a lot more likely to crack a component doing it by feel if you're ham fisted, than with a torque wrench. |
Originally Posted by Racer Ex
(Post 12166280)
...
And BTW, you're every bit as likely to have the same result as your picture employing "feel" and doing it in the same sequence. 1) screw both bolts into position where they just start engaging the bolted piece. Zero torque is on both bolts at this time. 2) alternating bolts, give one half a turn, then the other. As the torque starts building, start doing quarter turns. 3) stop when you get just past the point where the bolted joint holds. Tug gently on the pieces held together by the joint (i.e. the handlebars if it's the bar or stem clamp) to make sure the joint doesn't move. 4) If it moves with little pressure, move it back and give the bolts another quarter or half turn. Keep tugging at the pieces with increasing force until you are certain the pieces won't move under full stress. By doing this you get the feel of how tight the bolts need to get before the joint is secure. Because you give each bolt equal turns and eyeballing it as you tighten it down, you will never end up like the aforementioned picture. Torque wrenches merely speed the process getting to the holding force more quickly in the hands of an experienced wrench and limit the probability of stripping the screw threads. But if you don't respect the four steps above, even with a torque wrench, you still risk breaking the joint. But you're equally as likely to crack a component with a torque wrench if you're ham fisted, as you are doing it by feel. |
The torque specs for bolts and clamps does not protect the carbon fiber you are clamping. Don't go over 5 nm when clamping carbon fiber unless you have specific information as to the carbon fiber.
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Originally Posted by Brian Ratliff
(Post 12166405)
"feel" includes all the senses, including eyes. And no, even if you shut your eyes, you don't just go reefing on one bolt without giving the other bolt the same number of turns. The proper way to tighten double bolted joints is to:
1) screw both bolts into position where they just start engaging the bolted piece. Zero torque is on both bolts at this time. 2) alternating bolts, give one half a turn, then the other. As the torque starts building, start doing quarter turns. 3) stop when you get just past the point where the bolted joint holds. Tug gently on the pieces held together by the joint (i.e. the handlebars if it's the bar or stem clamp) to make sure the joint doesn't move. 4) If it moves with little pressure, move it back and give the bolts another quarter or half turn. Keep tugging at the pieces with increasing force until you are certain the pieces won't move under full stress. By doing this you get the feel of how tight the bolts need to get before the joint is secure. Because you give each bolt equal turns and eyeballing it as you tighten it down, you will never end up like the aforementioned picture. Torque wrenches merely speed the process getting to the holding force more quickly in the hands of an experienced wrench and limit the probability of stripping the screw threads. But if you don't respect the four steps above, even with a torque wrench, you still risk breaking the joint. fify |
Originally Posted by Brian Ratliff
(Post 12166211)
This is what happens when you blindly use a torque wrench:
http://hphotos-snc3.fbcdn.net/hs566...._3549529_n.jpg *by teh Trek |
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