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Hello All,
A group of drawings with 3 stepped outside diameters has a note saying:
All ODs on the part needs to be concentric within 0.07 TIR
The drawing are over 24 yrs old, and do not follow a good Engg Dwg Practice.
The machining is done by holding one of the ODs (unmachined) on a chuck, an turing the center hole and one side of the part.
Then the part is held by the OD on the other side, and turned to complete the job.
During assembly, for some unknown reason the impellor jams in the volute at the neckring area.
We have been using a dial indicator to measure the variation (having the impellor on a shaft) and the variation is quite high, and go upto 0.10
The machinist say, they are following the dwg, and they are machining it right.
I want to know how do you interpret this Note?
A group of drawings with 3 stepped outside diameters has a note saying:
All ODs on the part needs to be concentric within 0.07 TIR
The drawing are over 24 yrs old, and do not follow a good Engg Dwg Practice.
The machining is done by holding one of the ODs (unmachined) on a chuck, an turing the center hole and one side of the part.
Then the part is held by the OD on the other side, and turned to complete the job.
During assembly, for some unknown reason the impellor jams in the volute at the neckring area.
We have been using a dial indicator to measure the variation (having the impellor on a shaft) and the variation is quite high, and go upto 0.10
The machinist say, they are following the dwg, and they are machining it right.
I want to know how do you interpret this Note?