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We produce very tight tolerance parts and parts where every feature requires inspection, probably like many of the forum members. In the last few months, I started using the chamfer tool type to define my spot drills so I could obtain the correct diameter of the spot (since the chamfer type has a variable for the tip flat). In many cases we have drill depths that are +/- .005 and since MC does not have a variable for the tip point we often need to make substantial length compensation in the control. I find that one drill to another (same tool, same manufacture) this value is consistent which is no surprise to me and I am sure no surprise to you guys.

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shouldnt matter Dave, holding +-.005 is done at the machine. Drilling to an inch deep is -1.00 in code no matter what type of tool. measured in the machine correctly it will go -1.00

Note: Speeds and Feeds are only general starting points and may vary depending on specific applications. MILLING Working Material Application Cutting Speed fpm Cutting Speed m/min Chip Load ipt Chip Load mm/t ALUMINUM Aluminum (5–8% Si) (356, 308, 242, 208) Rough Milling 2000–5000 610–1525 0.010–0.020 0.254–0.508 Aluminum (5–8% Si) (356, 308, 242, 208) Finish Milling 2000–6000 610–1830 0.005–0.010 0.127–0.254 Aluminum Cast (8–12% Si) (354, 357, 380) Rough Milling 1500–4000 460–1220 0.007–0.015 0.178–0.381 Aluminum Cast (8–12% Si) (354, 357, 380) Finish Milling 1500–5000 460–1525 0.004–0.008 0.102–0.204 Aluminum Cast (12–18% Si) (390) Rough Milling 1000–2000 305–610 0.005–0.010 0.127–0.254 Aluminum Cast (12–18% Si) (390) Finish Milling 1000–3000 305–915 0.002–0.006 0.050–0.150 OTHER MATERIALS Babbitt Milling 700–1100 210–335 0.003–0.010 0.076–0.254 Brass Milling 2000–4000 610–1220 0.001–0.008 0.025–0.200 Bronze Milling 900–1350 275–410 0.003–0.008 0.076–0.200 Carbon Milling 500–2000 150–610 0.0003–0.012 0.008–0.305 Carbon Fiber Materials Milling 500–2000 150–610 0.003–0.015 0.076–0.381 Copper Milling 750–1500 230–460 0.001–0.008 0.025–0.200 Glass Fiber Material Milling 750–1500 230–460 0.001–0.010 0.025–0.254 Green Ceramic Materials Milling 500–1500 150–460 0.002–0.010 0.050–0.254 Unfilled Plastic Milling 1000–4000 305–1220 0.003–0.020 0.076–0.508 Wood Milling 3300–9800 1000–3000 0.004–0.030 0.102–0.762 TURNING Working Material Application Cutting Speed fpm Cutting Speed m/min Chip Load ipt Chip Load mm/t ALUMINUM Aluminum (5–8% Si) (356, 308, 242, 208) Rough Turning 2000–5000 610–1525 0.010–0.025 0.254–0.635 Aluminum (5–8% Si) (356, 308, 242, 208) Finish Turning 2000–6000 610–1830 0.005–0.010 0.127–0.254 Aluminum Cast (8–12% Si) (354, 357, 380) Rough Turning 1500–4000 460–1220 0.007–0.020 0.178–0.508 Aluminum Cast (8–12% Si) (354, 357, 380) Finish Turning 1500–5000 460–1525 0.004–0.008 0.102–0.204 Aluminum Cast (12–18% Si) (390) Rough Turning 1000–2000 305–610 0.005–0.010 0.127–0.254 Aluminum Cast (12–18% Si) (390) Finish Turning 1000–3000 305–915 0.002–0.006 0.050–0.150 OTHER MATERIALS Babbitt Turning 700–1100 210–335 0.003–0.010 0.076–0.254 Brass Turning 2000–4000 610–1220 0.003–0.015 0.076–0.381 Bronze Turning 900–1350 275–410 0.003–0.010 0.076–0.254 Carbon Turning 500–2000 150–610 0.005–0.015 0.127–0.381 Carbon Fiber Materials Turning 500–2000 150–610 0.003–0.020 0.076–0.508 Copper Turning 750–1500 230–460 0.003–0.010 0.076–0.254 Glass Fiber Material Turning 750–1500 230–460 0.001–0.015 0.025–0.381 Green Ceramic Materials Turning 500–1500 150–460 0.002–0.020 0.050–0.508 Unfilled Plastic Turning 1000–4000 305–1220 0.003–0.020 0.076–0.508 Wood Turning 3300–9800 1000–3000 0.004–0.030 0.102–0.762 DRILLING Working Material Application Cutting Speedfpm Cutting Speedm/min Chip Loadipt Chip Loadmm/t ALUMINUM Aluminum(5–8% Si) (356, 308, 242, 208) Drilling 2000–6000 610–1830 0.001–0.010 0.025–0.254 Aluminum Cast(8–12% Si) (354, 357, 380) Drilling 1500–5000 460–1525 0.001–0.010 0.025–0.254 Aluminum Cast(12–18% Si) (390) Drilling 1000–3000 305–915 0.001–0.010 0.025–0.254 OTHER MATERIALS Babbitt Drilling 700–1100 210–335 0.001–0.010 0.025–0.254 Brass Drilling 2000–4000 610–1220 0.001–0.010 0.025–0.254 Bronze Drilling 900–1350 275–410 0.001–0.010 0.025–0.254 Carbon Drilling 500–2000 150–610 0.001–0.010 0.025–0.254 Carbon Fiber Materials Drilling 500–2000 150–610 0.001–0.010 0.025–0.254 Copper Drilling 750–1500 230–460 0.001–0.010 0.025–0.254 Glass Fiber Material Drilling 750–1500 230–460 0.001–0.010 0.025–0.254 Green Ceramic Materials Drilling 500–1500 150–460 0.001–0.010 0.025–0.254 Unfilled Plastic Drilling 1000–4000 305–1220 0.001–0.010 0.025–0.254 Wood Drilling 3300–9800 1000–3000 0.003–0.025 0.076–0.635

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I find myself adjusting the spot drill depth at the machine a lot. It would be nice to be able to have the code come out perfect. I dont see how this is possible though with the variation in the tools being used. especially drills and spot drills and regrinds ect...Like you said you would have to use comparator for each tool.

Doesn't the depth calculator have an input for flat on tip? I understand that having the variable in the tool definition is ideal, but I would think that you would be able to nail your tolerance with this, especially if you're measuring the flat with a comparator. My 2 cents...

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It’s great to have drill tip compensation, however, the drill definition lacks a very important variable, the fact that most drills don’t come to a sharp point due to the drill geometry.

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G, yes as I stated I use this for spot drills. I guess I could use it for drillls too but I dont know if other issues will arise. BTW, it makes searching for tools in the library a challenge.

There is no difference between using a macro variable and a simple tool length wear offset. The real point is, if you can properly define the tool then this will not be needed.

I am in full agreement here. It would make life much easier. It might be easier if the field was just tip height. So we could all run out and measure tip to full diameter length. All we would need for inputs would be tip angle and tip length.

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Then modify the post to output the depth + your variable, you check the drills on the comparator anyway. Part of the setup would be to input your variables for the drills.

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If the variable was there, it would get you way closer than without it. The regrind is a good point but it would still be accurate if the grind was the same as the original (and it should be) for us, we dont use regrinds for many reasons so this would not be an issue.

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Mayday, I totally disagree. The depth of the point is not held, its the depth of the diameter. We measure the tool on a comparator now to get the tip info and then make the lg comp and the hole is dead nuts first part

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