Josh,
Depends on the material used (i.e., Snap-on vs. Harbor Freight).
Assuming the extension is made from a quality alloy steel such as 4130,
the shear stress at 350 ft-lb would be about 32 ksi (help stamp out
metric in my lifetime). This assumes the extension diameter is 7/8 so
that they can swag the 3/4 square. 4130 has a tensile yield of 63,100
psi. Assuming that the shear yield is 2/3 of the tensile, the extension
would be good for 42 ksi.
Put the torque on it and see. I have broken the square drive off of a
1/2 Harbor Freight Extension. No harm done. Just pop the square drive
out and throw it all away. That's why we buy disposable tools.
Neil Schiller
1983 C&C 35-3, #028
"Grace"
On 1/15/2018 1:15 PM, Josh Muckley via CnC-List wrote:
I thought about that too Bill, but a 3/4 output drive is going to be
limited to the given socket and quality there of. That's why I assume
the input is always smaller than the output (1/2 to 3/4) or (3/4 to 1).
Anybody wanna venture what the typical torque limits are on a 3/4
drive extension? It will probably be dependent on hardness, impact or
not.
Josh
On Jan 15, 2018 1:04 PM, "William Walker via CnC-List"
<[email protected] <mailto:[email protected]>> wrote:
Could it be that manufacturer of multiplier fears that the
extension will not be of sufficient quality/strength to transfer
the torque developed by multiplier?
Bill Walker
Sent from AOL Mobile Mail
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