Design Problems (Tool Design)

These problems are to accompany TECH 4571 – Tool Design

Design Problems (Tool Design)

Trepanning Cutter Design

A certain trepanning cutter uses a .25 square tool steel bit to cut a groove into thick polycarbonate sheets. The cutter is guided by a renewable #15 drill bit (screw machine length). Discuss design implications for the cutter geometry. Are there features that have definite minimum or maximum dimensions? Explain, and calculate values for those

Stair Spreader Bar

A factory supplies stair stringers with a rise and run of 7 and 12 inches respectively. A spreader bar is being designed to function as part of a lift system for these stringers. To work properly, a small hole must be drilled such that the spreader bar hangs parallel to the stringer in its installed...

Square Pegs in Round Holes

1) What is the length of one side of a square peg that can be inserted into the hole as shown? 2) What is the diameter of a hole that would exactly fit the square peg as shown? 3) What diameter hole would exactly fit the rectangular peg shown? 4) What is the width of...

Panel Clearance

Problem 1 A solid wood panel is to be designed to fit in the space shown. It is mounted on a hinge as shown. The 0.10 clearance (closed) must be maintained. What is the absolute maximum thickness (zero clearance when opening) the door can be? Problem 2 A compression molded phenolic panel is mounted on...

DC8 – Cross Sectional Area

The PDF below is an excerpt from the NASA document: DC-8, Airborne Laboratory Experimenter Handbook. Draw the outer envelope of the fuselage cross-section (it will consist of two arcs). Create a polyline from the circles. NOTE: The distance between the two arc centers is not given on the drawing. You will need to deduce this...