Checklist for Jigs and Fixture Design.

Machine.Are the correct speeds feeds available on the machine?Will the fixture fit into the machine for which it is intended.?Has the machine sufficient stroke length of slides to perform the operation.?Do the T- slots in the table lineup with the clamping holes or slots in the fixture.?

Machine.Is there enough clearance in these holes or slots to permit adjustments of the jig under the machine spindle.?Are the register blocks in the fixture base the correct size for the machine and are they correctly located ?Will any operating handle of the machine strike on the fixture or be prevented from moving by the fixture.?

Cutter.Can cutting tool be adjusted when the fixture is in place. ?Can cutter be readily removed for sharpening without disturbing the fixture.?

Locating the part.

Allowable variations in the part.If there are no previous operations.Vee locaters.Spacing of locaters.If the part is a rough casting.Locating points and the datum in the drawing is same or different.Accumulation of errors.

Setting Aids.Setting blocks.Stoppers.Dial indicator.Built in adjustors.

Previous operation.Locating points.Scratching or distortion of the part.Clamping.Knobs-finger space.

Bushings.Locking arrangement for slip bushes.Marking- drill, ream.

Manufacture.Standard parts wherever practicalTool dimensional tolerances.Avoid blind holes wherever possible.Use replaceable parts.

Design points.Is the fixture proportionally strong to damp out vibrations and chatter ?Are the dowel points in each part as widely spaced as practicable ?Is the accuracy of the operation require the base of the fixture to be scraped to fit the machine table.?Is it possible to forecast any design change of the part to make allowance in the design of the fixture.?