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Old 03-13-2013, 05:44 AM   #1 (permalink)
boo
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raw pump arm and link stock unthreaded, where can I get it?

Wondering where I can by some raw autococker pump arm stock. I bought a 10-32 die to cut the threads as well as a 6-32 tap and a 10-32 tap. Now I just need to get some stock. What size diameter do I order and where can I order it? Whats the best material? I assume stainless steel for the arm and brass for the joining link?
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Old 03-14-2013, 07:05 AM   #2 (permalink)
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Nobody knows? Perhaps one of our machinists here has some extra stock they'd want to sell me?
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Old 03-15-2013, 12:14 AM   #3 (permalink)
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Umm, I believe it's something like 3/16" diameter for the pump arm. What do you mean by "link"? Do you mean where the ram attaches to the pump arm?

Anyways, stainless would probably be the best bang for the buck, but people have used brass, aluminum, titanium, delrin, etc. You could probably use wood if you wanted to.

EDIT: You could probably find whatever material you want it to be on Amazon. They actually have quite the raw material selection.
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Old 03-15-2013, 01:12 AM   #4 (permalink)
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Awesome! That's where i got my tap and dies from as well.
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Old 03-15-2013, 11:48 AM   #5 (permalink)
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Sweet, I ordered a 36" titanium rod on amazon
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Old 03-15-2013, 11:43 PM   #6 (permalink)
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I just what sort of nasty tap do you have that you intend to thread TI with?
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Old 03-15-2013, 11:46 PM   #7 (permalink)
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Titanium work hardens so I would also advise against trying to thread it with hand taps.
I would have suggested you start out with aluminum so you could get the technique correct then try SS.

Good luck!
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Old 03-16-2013, 12:07 AM   #8 (permalink)
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A cheap hand die I ordered from amazon, a bench vice, a torque pipe (strong metal pipe), and maybe a presicion blowtorch (only outside so I don't burn the house down) and a force it wrench. Oh, and a dremel. I've tapped stuff before so I have the hang of it, never tapped titanium but hear it's a bitch. Yes i'm half assing it but it should be fun, or at least a good what not to do tutorial!

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Old 03-16-2013, 12:43 AM   #9 (permalink)
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If you are going to try it, I do recommend you use plenty of lubricating oil and go slow. The sound the tap makes will change if something goes wrong or if it is about to get stuck.

Using a die for the external thread will be just as challenging too.
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Old 03-16-2013, 03:08 AM   #10 (permalink)
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Quote:
Originally Posted by redlaser666 View Post
If you are going to try it, I do recommend you use plenty of lubricating oil and go slow. The sound the tap makes will change if something goes wrong or if it is about to get stuck.

Using a die for the external thread will be just as challenging too.
No way i'm going to make my link out of Ti, just the rod. I'll probably go the easy route on the link and use something nice and soft like brass. That way my guaranteed to be ****ty threads on the rod won't get stuck if something goes all crossthreaded.
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