Assignment #4a

Lead Screw Module Design: Handheld Vise

Andrew Norman

Richie Van Kuren

Nicholas Dunner

For this assignment we chose to create a small handheld vise that uses a lead screw and wing nut combination to adjust the jaw clamping force. Below are sketches and CAD models of some of the required components.

Sketches

Component Models

Nut

Washer

Spring

Pin

Jaws

Module CAD

Assembly

Analysis

F = P(μC+L)/(C-μL)

F = 2*torque/pitch diameter

P = load

μ = coefficient of friction

C = horizontal distance aka. circumference

L = vertical distance aka. lead

F = P(L-μC)/(C+μL)

Lead Screw

ACME Thread

Material: Low Carbon Steel

0.5" diameter (1/2 in.)

10 Threads per inch (tpi)

Yield Strength: 45,000 psi. (45 ksi.)

Tensile Strength: 60,000 psi. (60 ksi.)

Additional Information

For more information about the design and analysis of these components see the links below to my fellow team members webpages for Assignment 4A.