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   Trying to cut M32 x .75 threads internal and external (mating pieces) in Aluminum. having no success.Using G92 threading cycle (please don't ask me to switch to G76)

For the external i cut my stock to my External major Dia but after threading the diameter grows upwards of .020. I expect a little growth but this is excessive. I know my pitch is right, but now i'm questioning my major and minor diameters that i found using an online calculator because this is a custom thread.
Max major Dia = 1.2589
Min Major Dia = 1.2534
Max pitch Dia = 1.2398
Min Pitch Dia = 1.2353

Anyone got any suggestions? I need help.

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BrianPfeifer Members Profile Find Members Posts Newbie Joined: 13.Oct.2015 Location: United States Using: Bobcad Status: Offline Points: 7	Post Options Post Reply Quote BrianPfeifer Report Post Thanks(0) Quote Reply Topic: M32 X .75 threads Posted: 03.Jan.2018 at 22:23
	Trying to cut M32 x .75 threads internal and external (mating pieces) in Aluminum. having no success. Using G92 threading cycle (please don't ask me to switch to G76) For the external i cut my stock to my External major Dia but after threading the diameter grows upwards of .020. I expect a little growth but this is excessive. I know my pitch is right, but now i'm questioning my major and minor diameters that i found using an online calculator because this is a custom thread. Max major Dia = 1.2589 Min Major Dia = 1.2534 Max pitch Dia = 1.2398 Min Pitch Dia = 1.2353 Anyone got any suggestions? I need help.
	Brian Pfeifer

philippe JOSEPH Members Profile Find Members Posts Senior Member Joined: 14.Mar.2011 Location: France Using: AutoCAD Mechanical 2012 Status: Offline Points: 934	Post Options Post Reply Quote philippe JOSEPH Report Post Thanks(0) Quote Reply Posted: 04.Jan.2018 at 08:07
	Hello Brian, I have uploaded a file in the CAD / BIM Library : SCREW H M 16 x 35.dwg with inside the example for diameter M 32 x 0.75. All this is in accordance with what you can find at WIKIPEDIA ISO metric screw thread Please tell us if this helped or not. Edited by philippe JOSEPH - 04.Jan.2018 at 09:55
	Philippe JOSEPH

philippe JOSEPH Members Profile Find Members Posts Senior Member Joined: 14.Mar.2011 Location: France Using: AutoCAD Mechanical 2012 Status: Offline Points: 934	Post Options Post Reply Quote philippe JOSEPH Report Post Thanks(0) Quote Reply Posted: 05.Jan.2018 at 08:25
	Hello Brian, I joint this picture because I don't know if you have AutoCAD.
	Philippe JOSEPH


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