b'\x1b\x1a\x19 \x1f\x18\x1d\x17\x16 Machinists Cornerper pass, until the bore is 0.02" orof a machinist. live for a while, take care. I am 75 and so undersized. Then I check the cut- This material does not make curlydont plan on checking out soon, so ting edge. I dress it with a diamondchips; it crumbles when cut andI use a dust mask when doing this file if needed and then hit the fin- makes toxic dust thats not a goodlathe work.ished size. Hitting the mark is the artidea to breathe. So if you want toThe bolt circle is drilled on a CNC milling machine in the usual way. Figure 2 shows the mill setup. Be careful because 6" milling vises can generate a lot of clamping force. I find the center with an indicator. If I make more than one part at a time, I check the center on each one. The THE NAME TO KNOW FOR. bolt hole size is 0.3125". I use a high-speed steel, screw-machine-length LIVE TOOLS / ANGLE HEADS / SPEED MULTIPLIERS drill with a peck drilling cycle and SWISS COMPONENTS /MARKING TOOLS / KNURLING TOOLSRustlick water-based flood coolant. The coolant takes care of the dust.BROACHING TOOLS / SHRINK FIT TOOLS Holes are drilled at 700 rpm and a feed rate of 3 ipm. This produces a nice hole with clean edges and no frayed fiber. The combination of abrasive material with a low modu-lus causes the holes to drill under-sized. I use a 0.315" drill and take care to keep the edges sharp. The finished holes are good at 0.31" to 0.314". I check the hole size with gauge pins. A duller drill drills a smaller hole, which clamps on the side of the drill. A little care prevents that. If I made a lot of these parts, I would go to carbide drills, but that would be a whole different story. Like I have said in the past, high pro-duction is not my game.CTEPlatinum Tooling is proud to be the importer of Heimatec Live Toolsand Angle Heads, Tecnicrafts Swiss Collets and Guide Bushings,about the author Henninger Spindle Speeders, Quick Knurling and Marking Tools, Rineck Shrink Fit Tool Holders and REV Broaching Tools. Brandt Taylor is owner of Platinum Tooling offers a wide selection of machine toolBerlin, Massachu-accessories for most machine brands, including standard andsetts-based Tay-custom tools to help with the most challenging applications. lor Engineering, a machine shop If you need live tooling, were here to help. and manufactur-er of lathe chuck jaws. He can 16 E. Piper Lane, Ste.128|Prospect Heights, IL|847-749-0633 be reached at gbrandttaylor@[email protected]|www.platinumtooling.com gmail.com. For more informa-tion about the chuck jaws, visit www.stopjaws.com.14SEPTEMBER 2023 MachinistCorner.indd 14 8/15/23 12:38 PM'