Grant,
Just a thought.
Have you ever considered Temp Comp Gages? There are quality system that not only check the temp of the part, but also of the gage checking the part, as well as the part master. This process that is widely used in the aluminum piston manufacturing, as well as the rail...
Marco,
I apologize for a possible miss statement I may have made in the previous post. I said, "...it is probably more cost effective to locate the part between centers...". Locating between centers may not be an option. How you locate the part depends on the datums specified on the drawing...
The key is to locate positionally on a couple of dowel pins, and leave clearance around the the screw holes. This allows the fasteners to be used as just that, fasteners not locators.
Marco,
I am currently working on a project like this for a customer that machines shafts, pinions, and side gears. If you are only inspecting one or two items per part, it is probably more cost effective to locate the part between centers and use dial or electronic indicators.
If you are...
If you are going to put in a couple of dowels, I would not use the the threaded fasteners for locating.
If you have a problem finding someone to jig bore 50 microns or less, I would find someone to jig grind the holes.
A good jig grind hand can hold both size and location too 2.5 microns...
I would suggest a fixture gage that would locate on the datums that must be on location with the bore. You also add a precision bushing to the fixture that is located where the true position of the hole should be. Apply a custom made sweep unit to the bushing and the indicator located on the...