The Design of a Portable Pipe Threading Machine

This thesis is the presentation of the design of a portable pipe threading machine having improved operational usefulness and increased sales advantage over present machines. An investigation of the present portable pipe threading machine market has been conducted including a product study, a survey of consumer preference in a sample market, an analysis of the present market, and a patent investigation. Technical research has been done consisting of tests to determine operating torque loads, an investigation of chaser form and threading speed, development of automatic chucking systems, and an investigation of suitable materials and new processes for portable pipe threading machine manufacture. Design studies have been made of an ideal portable pipe threading machine, of portable rotary-tool machines, and of portable rotary-pipe machines. The final design offers the following improved features over present portable machines: (1) separate threading assemblies for each pipe size, but only one opening mechanism; (2) a power-driven cut -off mechanism; (3) a reamer mounted behind the diehead; (4) a positive gripping automatic chucking system. A stress analysis, a cost analysis, a weight analysis, a market estimate, sales and advertisement features, maintenance and service considerations, and assembly drawings have been prepared for this machine.