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I am making parts for a company out of tungsten. They have a 1/4-28 unjf-3b thread. I am giving 2 gages the 3b gage to check the pitch of the thread and a 2b gage to check the depth. My tap goes the correct amount of turns but the 2b depth gage does not. Need at least 23 turns for proper depth I get 24 with the tap but only 16 with the gage any suggestions. I've tried retapping, reaming the hole after the tapping to get rid of any tapper but still only get to like 19 turns of the gage.
I wrote a threadmill program using a 5/8 diameter multi toothed threadmill with 16 threads per inch. I turned off all types of entry and just clicked start at center. So the tool starts in the center at the bottom of the hole, moves perpendicular into the wall and works it way up at my pitch of .0625 Well when I post it out, the first quarter of the arc movement it doesn't move in a z axis. Then on the exit, the last quarter of the arc it doesn't move in a z axis. This is giving me overlapping threads. I've never seen this happen before or maybe I just never noticed it. Here is a copy of my post: (THREADMILLS FOR 1-5/8"-16 THREAD) T6M6(5/8" X 16 PITCH THREADMILL) M11 G0G90A0.(INDEX) M10 G5.1Q1 G0G90G54X.0003Y0.S5500M3 G43H6Z6.T4M8 Z5.052 G1Z4.327F50. G41D6Y-.485F35. G3X.4853Y0.I0.J.485 X.4853Y0.Z4.3895I-.485J0. X.0003Y.485I-.485J0. G1G40Y0. Z4.327F50. G41D6Y-.4925F35. G3X.4928Y0.I0.J.4925 X.4928Y0.Z4.3895I-.4925J0. X.0003Y.4925I-.4925J0. G1G40Y0. Z4.327F50. G41D6Y-.5F35. G3X.5003Y0.I0.J.5 X.5003Y0.Z4.3895I-.5J0. X.0003Y.5I-.5J0. G1G40Y0. Z4.327F50. G41D6Y-.5F35. G3X.5003Y0.I0.J.5 X.5003Y0.Z4.3895I-.5J0. X.0003Y.5I-.5J0. G1G40Y0. G0Z5.052 Z6. G5.1Q0 M5 G91G28Z0.M9 G91G28Y0. G0G90G54X-20. M201 M30 Hopefully someone can figure this out. I know if I turn on helical entry and exit it fixes this. I'm wondering why this would even be an option in a threadmill program. Is this a glitch?
Does X7 verify shows threads cut on a lathe correctly? I see concentric rings. Bigger question. Can I cut a helical groove path on a 2 axis lathe with a groove tool? Feed rate would be crazy. The tool has to have a lot of lead clearance. I'm trying a thread path with a groove tool. Its close but verify doesnt show it correctly. I know the math for drawing true threads is is HUGE. I can make a form tool for the shape I need. Im just trying different ideas. You have to think outside the box to get this one to work. Think of a collied hose for a airgun.I need that shape for 9" or so. Without a form tool, I dont know if I can cut the profile with a groove tool. The start , stop points have to be on the money. Any Ideas I'm not seeing? Machineguy The material is clear plastic rod, 1.250 dia.