For the machinists

[saponi1]

I have a coworker who has had a streak of bad luck in the last month. 2 scrapped parts, and one $75,000 rework. I hate to see it happen to anybody, but it's part of being a machinist. I got to thinking about my most expensive scrapped part. A 20" body,material-duplex, price-$25,000. Also scrapped a $1500 piece of inconel, and a $1000 piece of 316ss in a year and a half time frame, but it was early in my career. I know I ain't the only one, so what's your most expensive scrapped piece.

[blacknblue#2]

A 75k rework is a chunk of change, What was the final price of the part for that not to be scrapped out. My worst was a 40K windmill hub. It was the main hub that the blades of a windmill bolt to. It weighed 12,500 when the casting come in and we turned about 5000 pound of material off of it on a VTL. The machine i ran at the time made 175 an hour and those parts took about 20 hours to run. Needless to say i scrapped it at the best time (sarcasm) the last hour it was on the machine. Machining is easier and less stressful if you know what your part does after assembly. For example if your drilling cobores for a bolt head to set in. Those should be wide open and no worries. But if your turning a +/- .0002 bearing race diameter than you best be backing the machine off and taking semi finish passes haha.

[saponi1]

I think the finished part weighs 30-35,000#. It's an annular body, 60-70" o.d.,and I think it's about $200,000 without the guts in it. It was supposed to get 32 2.875 thru holes with 3.-8 threads and 3.5 c-bores. Dude set the part on the hbm, centered it on his table, and forgot to set his X0..The holes were drilled 2" off and at an angle. I felt bad for him, because afterwards he asked if they wanted him to roll his box out. The $75,000 for the rework came from having to make plugs, the plugs themselves, welding, rerunning on a vtl, then an hbm.

[C41Xracer]

mine was a $12000 forging but that was very early in my career i was 22 or 23 at the time

[saponi1]

Yeah, mine happened in my second year. Sometimes you forget to change a G90 to a G91, or reset your X0. & Y0.

[Pipeless416]

mine was a $12000 forging but that was very early in my career i was 22 or 23 at the time

what forge shop? i'm a process engineer at one..