Interesting Machining Variation

[John Sabato]

this is a non-critical dimension and IMHO, either appearance was probably within manufacturing tolerance for final dimensions of the frame, and would have passed final inspection for production and issue.


I imagine that they were just a little more careful on the WW2 guns because manufacturing methods had improved considerably since WW1 and they could be more precise without incurring a production time loss.


I checked the frame blueprints on Frank Rial's CD, but there are no notations about tolerances on the relevant prints where that line "sometimes" appears. Any of you other engineers out there care to comment?


Does anyone have any other copies of Luger frame blueprints that might inidicate manufacturing tolerances for the finish of this portion of the frame that could substantiate or disprove my theory??? Constructive comments are invited and appreciated


regards,


John Sabato