Lead screw has square threads with a pitch of 2.3 mm and a mean diameter of 16 mm. The coefficient of friction is 0.25 and the lead screw is loaded at 5 kN and assume the motor torque input is 25 N. m. - A screw jack has a thread with a 6.5 mm and a mean diameter of 30 mm. The coefficient of friction is 0.20 and jack is loaded at8 kN upward with a handle of 700 mm.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter4: Numerical Analysis Of Heat Conduction
Section: Chapter Questions
Problem 4.28P
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Jack screw works on principle that thread is rotating and screws are lifting/lowering a load, whereas lead screw
is used to convert rotational motion into linear motion as in 3D printers (see Figure.7). You are working in
company that designs screw jack and lead screw for 3D printers and your role is to determine operating
efficiency of both mechanisms and provide detailed report of your work.
Lead Screw
Figure.7: Screw Jack (left) and 3D printer's lead screw (right)
You have been given the following information;
Lead screw has square threads with a pitch of 2.3 mm and a mean diameter of 16 mm. The
coefficient of friction is 0.25 and the lead screw is loaded at 5 kN and assume the motor torque input
is 25 N.m .
A screw jack has a thread with a 6. 5 mm and a mean diameter of 30 mm. The coefficient of friction is
0.20 and jack is loaded at8 kN upward with a handle of 700 mm.
Transcribed Image Text:Jack screw works on principle that thread is rotating and screws are lifting/lowering a load, whereas lead screw is used to convert rotational motion into linear motion as in 3D printers (see Figure.7). You are working in company that designs screw jack and lead screw for 3D printers and your role is to determine operating efficiency of both mechanisms and provide detailed report of your work. Lead Screw Figure.7: Screw Jack (left) and 3D printer's lead screw (right) You have been given the following information; Lead screw has square threads with a pitch of 2.3 mm and a mean diameter of 16 mm. The coefficient of friction is 0.25 and the lead screw is loaded at 5 kN and assume the motor torque input is 25 N.m . A screw jack has a thread with a 6. 5 mm and a mean diameter of 30 mm. The coefficient of friction is 0.20 and jack is loaded at8 kN upward with a handle of 700 mm.
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