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I'm back!- with machining abilities

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I'm back!- with machining abilities

Unread postAuthor: saefroch » Mon Nov 26, 2012 10:04 am

Hello all! It's been a long long time since I posted here or did much spudding-related. I'm now in college, and have access to a pretty well-equipped machine shop. Mostly I see myself using the end mill (+/- 0.001" in x and y, +/- 0.005 in z) or lathe (+/-0.0005").

Of course, this means I'll be picking up work on what I still have indicated as my current project in my sig. I'm now considering making a new valve body or cross fitting from scratch, but I'm a little unsure (a question for you machinist types out there) exactly how to turn female pipe thread. I could of course just make my own tool, but I'd be more comfortable if it can be done using fairly standard lathe tools.
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Unread postAuthor: velocity3x » Mon Nov 26, 2012 10:15 am

Lathe....Internal thread bar.
Mill.....Thread mill.
Last resort....Pipe tap.
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Unread postAuthor: saefroch » Mon Nov 26, 2012 10:25 am

Internal thread bar. Thanks!

I don't think I'll be using a pipe tap, I sorta doubt the shop has pipe taps.
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Unread postAuthor: Technician1002 » Mon Nov 26, 2012 1:11 pm

A lathe can be difficult to use to thread pipe threads due to the taper so parts tighten as they come together to seal. Machine threads is commonly done on a lathe. My advise, use the correct tool, a pipe tap.
http://www.engineeringtoolbox.com/npt-national-pipe-taper-threads-d_750.html
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Unread postAuthor: saefroch » Mon Nov 26, 2012 3:50 pm

What does the "Tap Drill" column in that chart indicate?
I love that site btw
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 26, 2012 4:45 pm

saefroch wrote:What does the "Tap Drill" column in that chart indicate?
I love that site btw


The size of the hole you have to make before tapping the thread.
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Unread postAuthor: saefroch » Mon Nov 26, 2012 4:49 pm

Ohhhh thanks.

Message too short.
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Unread postAuthor: velocity3x » Mon Nov 26, 2012 10:05 pm

Technician1002 wrote:Machine threads is commonly done on a lathe.


If he has access to a CNC lathe, pipe thread is extremely easy.
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Unread postAuthor: saefroch » Tue Nov 27, 2012 1:30 am

It's not a CNC lathe, oh how I wish it were.

I'm going to stop by the shop tomorrow (today, actually it's past midnight) and try to consult with the resident machinist.
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