Machine Design
Buttress threads are usually found on

Feed mechanisms
Screw cutting lathes
Spindles of bench vices
Railway carriage couplings

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Machine Design
The face of the tooth is the

Width of the tooth measured along the pitch circle
Surface of the tooth below the pitch surface
Surface of the tooth above the pitch surface
Surface of the top of the tooth

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Machine Design
When the shaft rotates in anticlockwise direction at high speed in a bearing, it will

Move towards right of the bearing making metal to metal contact
Move towards left of the bearing making metal to metal contact
Have contact at the bottom most of the bearing
Move towards right of the bearing making no metal to metal contact

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