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TIL that switching from G96 constant surface speed to straight G97 on my finish pass saved my 4140 job
I was running a batch of 4140 shafts last week on my Haas ST-20 and kept getting a weird finish near the chuck, kinda scaly and inconsistent. The part was about 3 inches at the big end tapering down to 1.25, and I was holding G96 at 350 sfm the whole way. My boss walked by and said try locking it in G97 for the finish only, around 800 rpm, and just see what happens. I was skeptical because constant surface speed is drilled into you from day one, but the finish came out way more even, no more chatter marks near the bigger diameter. Turns out at higher spindle speeds the G96 was pushing the rpm past what the chuck jaws liked on that longer part. I ran the next 40 pieces with G97 in the finish block and didn't scrap a single one. Curious if other guys here use G97 for finishing or do you stick with constant surface speed all the way through?
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