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| Another version of how not to build a model engine |
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| Darren:
How about making a tap on the lathe? :dremel: You can have whatever pitch you need then. |
| sbwhart:
You can get 60 TPI (0.423mm pitch) from her http://www.tracytools.com/tapsanddiesfinethread.htm Hope this helps Stew |
| sorveltaja:
--- Quote from: Darren on November 13, 2009, 01:32:37 PM ---How about making a tap on the lathe? :dremel: You can have whatever pitch you need then. --- End quote --- It's indeed possible, but I'm completely newbie, what comes to required hardening process. On the other hand, if the tap is used to thread ptfe, it wouldn't need any hardening.... The needle body doesn't have to be made of metal? Anyway, thanks for the tip, I'm going to test how I can manage :thumbup:. |
| Darren:
If you want to tap a softer material you could thread a Silver Steel/Drill rod to the sizes required. Then grind a groove down one side, or maybe two sides. Touch it up with a stone to sharpen the cutting edge. I'm guessing, cos I have never done it, then you will now have something between a regular cutting tap and a thread forming tap. If you want to harden it, just heat to a bright red and quench in water. Then re-heat noting the colour change required and allow to self cool in air. You say a newbie as if that should limit you? Not so ...ask they guys here where they started ... just go for it :thumbup: |
| sorveltaja:
Thanks, I will :dremel:. I tested making a 0.2mm pitch thread on the lathe, and found out, that the cutting tools tip has to be very sharp, without any radius. I wonder, how watchmakers sharpen their thread cutting tools. With the aid of microscope perhaps? Back to sharpening I go ::). |
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