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Recent content by crossthread82

  1. C

    Clamping Large Billets on Horizontal Machine

    Big difference between using pitbulls in a subplate where the plate is sitting on the subplate and clamping it in a vise with 40+ unsupported between the jaws. If going the vise route I'd put some jack bolts as support pads underneath the middle somewhere to cut down on the harmonics. Or Amrock...
  2. C

    Clamping Large Billets on Horizontal Machine

    MAG3? If you're going to be getting rowdy with a 2" indexable cutter I'd want that thing bolted down to the table. You can put spacer bushings underneath the holes to hold the plate above the table by 1/2" or so.
  3. C

    Pull-Back v/s Dead Length Collet Chucks

    We personally haven't had any issues running our royal QG65 dead length on the main spindle side. But this is useful to know in case one day it gives us issues!
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    Modular Endmill Extension (screw on head) Brand Compatibility

    As @gregormarwick mentioned above the list I linked is for screw in type indexable insert milling heads. Afaik most manufactures use a proprietary system for their exchangeable solid carbide headed endmills, though YMMV; I haven't bought enough of them to figure out if they are interchangeable...
  5. C

    Machine both ends of a bar at the same time

    The real question here is how many do you have to do and how fast? That'll dictate which route/how much money and time you should devote to this.
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    Modular Endmill Extension (screw on head) Brand Compatibility

    Not sure about exchangeable headed endmills but Maritool has a list showing screw in indexable tool cross compatibility: https://www.maritool.com/images/Indexable-Cutter-List.pdf
  7. C

    Threading Operation Doubt

    I think your print is wrong. My book says 1-11.5 npsf major diameter is 32.72mm which would be why your no-go is going in when you cut the thread 0.4mm larger. Your gage pd's seem right though so I'd trust them. Edit: Also the major diameters on plug gages don't really mean anything; they're...
  8. C

    4 X Diameter in 304?

    You can get away with no coolant if you slow the sfm down and lube it with some oil before you start the hole. I'd spot with 140deg spot drill then peck with a 135 split point parabolic drill 8% cobalt. Peck every ~0.075". Not going to last forever though, probably only a few parts. What's...
  9. C

    power tapping 1-8 in Stainless

    I want to know how the insert drills they show don't explode when they hit one of the slats on the backside of the plate when it drills a hole lol
  10. C

    power tapping 1-8 in Stainless

    I agree, however your machine needs some stones to run a 1-8 form tap let alone in stainless. My guess is 1-8 form in 304 would take 150+ ftlbs to turn. Lowest torque would be spiral point tap. Though OP hasn't said what method is putting the holes in which will dictate a lot.
  11. C

    power tapping 1-8 in Stainless

    I'm assuming your burning the tap drill holes in? If so that's going to murder that tap. If drilling the tap drill size holes in then a spiral point tap from emuge should punch those in in one go.
  12. C

    HDPE tooling for best surface finish

    Datron monoblock mcd facemill?
  13. C

    2.375in hole in 17-4

    Helix bore with a feedmill. Could still drill the center to give the chips somewhere to fall out of.
  14. C

    Aluminium 6061/6082 on profiling surface finish

    You'll never get a shiny finish surfacing aluminum with the center/tip of the ball. You have effectively zero sfm at the center so its pushing and smearing more than it's cutting. Use a bull mill with a fat corner rad to surface with, that way the tangent point of the corner rad is further...
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    New CNC 5 axis

    Personally I'd steer clear of a Doosan with a HH control, it's not their main control option for a reason. You have the robo's so using fanuc is already easy for you. Although it is somewhat limiting in the 5 axis department.
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