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ME 440 Fall 2010 Project 1 |
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The following data are taken from Mcmaster-Carr Catalog (http://www.mcmaster.com/#drive-wrenches/=8oy0do).
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The wrench has these major components:
handle, ratchet, drive, switch, and cover. This list is not inclusive. ·
Design a similar (not necessarily
identical) ratchet wrench. ·
Assume that loads are static (use the
worst-case scenario). ·
Use an appropriate human factors handbook
to obtain suitable dimensions for the wrench. · You are to choose materials and dimensions such that the machine will not fail due to any possible combinations of stresses. ·
Use the
rapid prototyping machine to create a model of your design. Note: You may need to disassemble a wrench to better understand it.
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1/4" Square Drive Ratchet
Wrenches
Wrenches
are premium quality and made of alloy steel. All have a reversible ratchet. High-torque wrenches have a pear-shaped head that
tends to provide more torque, but requires a 6° to 15° handle swing. Tight-clearance wrenches have a round head that requires a 0°
to 10° handle swing; they're great for use in confined spaces. Push-Button Release—Push
the button to release the socket. Sealed Head—A gasket seals in permanent
lubrication and keeps out contaminants such as dust, dirt, and moisture. Twist-Action Speed Drive—Use as
a reversing ratchet or rotate the handle to turn the square drive. Handle has
a cushion grip. Palm Control—Hold down the ring on the top
of the head while turning to prevent accidental reversal. Flex Head—The head pivots 90° up and
down. Fine Control Silent—Also
known as tight-spot 0° ratchets. All have a series of rollers (instead of
gear teeth) that engage with the slightest handle movement. A through hole
allows use with hex keys. High-Torque Wrenches
Standard
Push-Button
Release
Sealed
Head
Twist-Action
Speed Drive
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