RETROFIT OF A KEARNEY AND TRECKER CSM HORIZONTAL BED MILL WITH BENDIX NUMERICAL CONTROLS
Abstract
A Kearney and Trecker CSM Horizontal Bed Mill was retrofitted with Bendix Numerical Controls and the performance evaluated in the machining of 5 pieces each of 5 typical aircraft parts. Time required in planning, part programming and computer operations for the retrofit was comparable to that required for a new N/C machine. Toolingdesign and fabrication time was also considered comparable. The efficiency of this machine when compared to an N/C machine was set-up time, 92.9% and machining time 87.5%. Structural design and low spindle speeds of the original machime required was considered equal. Accuracy of the parts was 96.3% as good as those produced by a new machine. Surface finishes were comparable. Cost of retrofitting a second machine of this type was quoted at 92.6% of the cost of an N/C machine, comparable in size and cne imposed the limitations which resulted in the lowered efficiency. The average composite time efficiency per piece (set-up + machine time) for the parts produced was 90.8% that of an N/C machine. Inspection time required was considered equal. Accuracy of the parts was 96.3% as good as those produced by a new machine. Surface finishes were comparable. Cost of retrofitting a second machine of this type was quoted at 92.6% of the cost of an N/C machine, comparable in size and capacity. Procurement time through retrofitting is 43% longer than that required for an N/C machine. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 09, 1961
- Accession Number
- AD0271402
Entities
People
- J.h. Rohde
Organizations
- McDonnell Aircraft Corporation