Toolroomguy
Cast Iron
- Joined
- Jul 9, 2010
- Location
- Wisconsin
We had some simple parts made by a local general machine shop because we are swamped.
5 1/2" by 4" with a print dimension of .375" thick.
Tapped holes, dowel holes, bolt holes, and some clearance cuts on the periphery.
The title block gives a +/- .005" on a three place decimal.
They were told they had to grind the thickness.
Parts come in .355" one end .364" other end.
They said they told the engineer they would come in undersize because they started with 3/8" cold rolled.
The print was never changed.
They claim the parts meet print because there is no parallelism call-out on the print.
Apparently we should use the center of the part as nominal, and one end is -.005 ,and the other end +.004, so it meets print.
Does anybody agree that a 5 1/2 " x 4" ground part can have .009" taper across it?
Is this a normal shop practice?
They want to be paid for these parts which we can not use.
We had to make them ourselves because there is no way I am giving the automation guys a part that would be scrapped out if we made it.
5 1/2" by 4" with a print dimension of .375" thick.
Tapped holes, dowel holes, bolt holes, and some clearance cuts on the periphery.
The title block gives a +/- .005" on a three place decimal.
They were told they had to grind the thickness.
Parts come in .355" one end .364" other end.
They said they told the engineer they would come in undersize because they started with 3/8" cold rolled.
The print was never changed.
They claim the parts meet print because there is no parallelism call-out on the print.
Apparently we should use the center of the part as nominal, and one end is -.005 ,and the other end +.004, so it meets print.
Does anybody agree that a 5 1/2 " x 4" ground part can have .009" taper across it?
Is this a normal shop practice?
They want to be paid for these parts which we can not use.
We had to make them ourselves because there is no way I am giving the automation guys a part that would be scrapped out if we made it.