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#1
 
01-29-2010, 09:56 AM
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I have a project coming up that is going to require me to turn 1/4-28 invar screws from bar stock. Any ideas on feed and speed, I was thinking 130SFM at .002-.003" per rev. Any tips on threading, I will be using full profile laydown inserts, I was planning to use G76 with 5 passes. Any tips and tricks would be greatly appreciated. Thanks in advance to all that reply.  |
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#2
02-22-2010, 07:04 AM
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| Just a quick bump and a progress report on this issue. I used the recommended speeds and feeds out of the book for this material and turning it was fine. I did run into a major issue with chattering while threading. The threads looked terrible. I played around with the threading portion, ie G76 and discovered that using an A55 modified infeed produced excellent results. We even turned some 4-40 screws out of invar and they looked great. Just thought I'd give an update in case anyone else runs into this issue. |
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