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  1. bakerbj

    How to use NoGo thread plug gage?

    I'm only getting 1 - 1.25 turns on the NoGo side right now.(plug gage) Usually, we don't even get a half turn, but this shipment a taps I received seems to be cutting a little larger than the last few. There's no drag on the go side at all. I'm having the gage checked for wear.
  2. bakerbj

    How to use NoGo thread plug gage?

    I would like to know the proper use of NoGo thread plug gages. My customer contacts aren't around today so I can't get the standard from them, it's not on the print, and I don't have it. That's some important information I need obviously. The production manager believes the part can make up...
  3. bakerbj

    What are some possible causes of crooked threads?

    It is a lead-screw type machine so I'm currently designing a clamping devise to hold down the parts through the tapping operation.
  4. bakerbj

    What are some possible causes of crooked threads?

    I was having the same problem at the chamfer station but fixed it with the spring loaded hold down devise (for lack of better term) in the back.
  5. bakerbj

    What are some possible causes of crooked threads?

    Finishing tap? I would say yes. I was thinking that lifting upon the intial cut is something that could be going on and maybe adding some puematic mechanism to hold the part down while it's being tapped.
  6. bakerbj

    What are some possible causes of crooked threads?

    I have this machine that is threading tapping lock nuts at a defect rate of ~1800 PPM. The thread perpendicularity spec. is .005" and the majority (85%) of the parts fall within the lower half of that. I've attached a picture of the machine, it has a loading station, chamfering, tapping, and...
  7. bakerbj

    Cp/Cpk & Flatness Tolerances

    Is 50 parts enough for an accurate measurement? I'm working with a volume of 250,000 annually. Won't I need a very large sample?
  8. bakerbj

    Cp/Cpk & Flatness Tolerances

    Glad I found this. I'm trying to do the exact same thing today.
  9. bakerbj

    Anyone had an online CNC training coarse?

    (Like toolingu.com)I was wondering if they actually work and couldn't find any reviews about them. I have the mathmatics and used to know G&M codes, but after not really using it for 5+ years, I've pretty much forgot. I'd like to take a lab coarse or something around here but finding one...
  10. bakerbj

    Warped thin parts after heat treat.

    I'll have to look into the feasibility of clamping the parts we make. We're going to be producing hundreds of thousands of these so as mentioned, labor, handling, cost, etc... may be an issue. Would clamping these parts and reheating them save ones that have already been warped? I have like...
  11. bakerbj

    Warped thin parts after heat treat.

    I have some 2.25mm thick parts, ring shaped, 1020 steel, that are warping after heat treating. Case hardening spec. Nitrocarborize 0.01 to 0.03mm Dep compound depth zone surface hardness 60 Rc min. (file hard) Diffusion layer depth 0.15mm min. oil quenched The parts are flat (w/in 0.015mm)...
  12. bakerbj

    Another tapping problem. (burrs)

    That is one option I have been looking into. I have a straight flute tap that I haven't tried yet. If it doesn't work I will try the spiral flute. What are the advantages to spiral flute? Chip removal?
  13. bakerbj

    Another tapping problem. (burrs)

    The material spec calls for 1008-1010 hot rolled, descaled and oiled. Actually, I havent checked for a burr after chamfer. I'll look into it next time I run a trial. (prob Monday) We currently run 3 other similar parts on this machine with diameters from 32-36mm though. The center hole is...
  14. bakerbj

    Another tapping problem. (burrs)

    Basically the machine works like a drill press. (its a custom machine) The part sits in a fixture on a 4 station rotating table. Load, chamfer, tap, unload. The Chamfer on the one side is stamped in the press. The OD is has four 4.5mm radius slots for a spanner wrench, also keeps the part...
  15. bakerbj

    Another tapping problem. (burrs)

    Sorry 4.5 mm.
  16. bakerbj

    Another tapping problem. (burrs)

    I've got a 55 mm circular part, notched on the OD in 4 places, with a 40.6 mm hole threw the middle. The hole requires a M42 x 1.5 D9 thread. The tap I tested is 6 flute (straight), TiN coated. I may be running about 100 RPMs fast as the machine only has two speeds. I keep getting a rather...

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