This report details the engineering design, development and application of equipment to produce step threads (constant lead thread on two or more diameters) on the breechblock of cannon. The equipment uses a blade type tool with the part being threaded through shaper type cuts until finish size is reached. The use of this equipment will reduce the floor to floor time from 7.5 hours to 2.0 hours while producing better thread finishes and more accurate dimensional sizes. (Se)
Automatic step threading of breechblocks
Automatisches Scheiden abgesetzter Gewinde in Verschlussstuecken von Geschuetzen
US Government Reports ; Jun ; 1-25
1977
25 Seiten
Report
Englisch
Threading structure on safety chair and threading method
Europäisches Patentamt | 2015
|Emerald Group Publishing | 2007