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Old 11-07-2011, 04:03 PM   #1 (permalink)
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Making an ASA...

Can you even make an ASA on a conventional? I was looking at the spec for an ASA and yeah, it looks kinda tricky. Any tips?
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Old 11-07-2011, 04:15 PM   #2 (permalink)
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a conventional what?
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Old 11-07-2011, 05:47 PM   #3 (permalink)
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a conventional what?
hah, lathe I hope.

I would have to buy or grind a tool to thread in reverse, just to be able to see what I'm doing at least. With that, I don't think it would be too bad. I would still set up an indicator from the chuck side so that it can run on out without much worry.
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Old 11-07-2011, 06:58 PM   #4 (permalink)
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If the question is lathe, as Spider! said, then yes. I've done it several times.
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Old 11-07-2011, 10:11 PM   #5 (permalink)
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Old 11-07-2011, 10:51 PM   #6 (permalink)
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Because you either need a bottoming tap or to grind the starting leads off a plug tap. And while it works, it is technically oversized from the ASTM specifications for an ASA. Which is a better choice than undersized like many manufacturers have done in the past.
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Old 11-07-2011, 11:14 PM   #7 (permalink)
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Nah, not possible.


Well, if you try real hard...
Use a dial indicator to tell when you have to end the thread.
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Old 11-08-2011, 07:27 AM   #8 (permalink)
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I think I have already seen that part somewhere ^^

Btw I think it's barely realisable on a lathe; switch of to the 14TPI gear, put on your beloved 60 internal threading tool and FULL POWER!

That would be my way to do


Oh and HaveBlue did some nice job on measuring the thread dimensions; you will find them on this page
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Old 11-15-2011, 12:29 PM   #9 (permalink)
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Oh and HaveBlue did some nice job on measuring the thread dimensions; you will find them on this page
I'd be hesitant to use those thread dimensions, as I really need to update that page. There's a proper ASTM standard that should be followed - while I have a copy of the standard, it's copyrighted, so I can't post the pdf. However, if you have a local engineering college, you should be able to find the needed standard in the ASTM volumes that the engineering library should hopefully have.

One of these days I hope to redraw the ASTM drawings myself so that I can legally put them up on the ratsnest. Of course, I've been saying 'one of these days' for several years now...
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Old 11-15-2011, 04:41 PM   #10 (permalink)
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I redrew it a while ago so it could be distributed - I can re-render a more generic one for the Rat's Nest (or just toss these up if you would like), or I can render them as nicer PDFs as well if you want. The tolerances are either the same or tighter than what is in the ASTM standard
(depending on what specific dimension you are looking at that is).



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