b'\x1b\x1a\x19 \x1f\x18\x1d\x17\x16Machinists CornerMILLING FIXTURE TIPSBy Brandt TaylorI n this article, Ill show a method to make a modular fixture for mill applications. The fixture uses an off-the-shelf mechanical clamp and a novel work stop.Holding parts for machining on a milling machine can be challenging. For our purposes here, the problem is machining a long, skinny part. It is a tool steel machine knife that mustShown are the fixture and the part unmounted. B. Taylorhave an array of countersunk holes installed. The part has dimensions of 4.75 mm by 19.05 mm by 469.9 mm (0.187"0.75"18.5"). Marks on the edges of the part are not allowed. The batch has 50 parts to process, so quick part change is in order. Fig-ure 1 shows the fixture and the part unmounted. Figure 2 shows the part mounted on the fixture. Figure 3 shows details of the fixture hardware. The part is mounted on the fixture. B. TaylorThe fixture base is 38.1 mm by 127 mm (1.5"5") aluminum bar stock that is 533.4 mm (21") long. The top and bottom faces of the bar stock are finished flat and parallel. The bottom face has two T-slot keys in-stalled that fit into a T-slot on the milling machine table. Two counter-bored holes are provided on the top face of the fixture to accept T-slot clamping nuts. One of the counter-bores is finished with a boring bar so that hole can be used as an index when installing the fixture on the ma-chine. The two T-slot keys and two T-slot clamping nuts all use the same T-slot on the milling machine table.The fixture uses an array of five hex head pins and five edge clamps to hold the part being machined. OneB. Taylorround dowel pin at the end of theDetails of the fixture hardware are displayed.14SEPTEMBER 2020 MachinistsCorner.indd 14 8/17/20 11:19 AM'