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Topic: Zum Pull Rod thread size? |
Tony Glassman
From:
The Great Northwest
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Posted 29 Mar 2008 1:27 pm |
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Does any one know the thread size on the Zum pull rod at the changer end. Mine is a '97 with the slotted/split bell-cranks. The rods have a perpendicular roll pin which fits into the slots of the bell crank finger.
I have a few pull rods that are too long for the knee levers on which I want to add changes. I'd like to shorten and re-thread them at the tuner end.
I initially thought the threads might be 6-32 or 6-40, which they're not. They seem closer to a 5-28 or 5-40, but I'm not sure. I don't mind ordering a dye if I know the correct size.
Anyone? |
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chris ivey
From:
california (deceased)
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Posted 29 Mar 2008 4:59 pm
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i would think you could call bruce...
i thought they changed the rods and bellcranks before that...mine is an '82 with that style.. |
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Tony Glassman
From:
The Great Northwest
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Posted 29 Mar 2008 5:20 pm
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| My is a '97 according to the s.n.# table on the Zumsteel website. |
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Danny Letz
From:
Old Glory,Texas, USA 79540
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Posted 30 Mar 2008 8:41 am
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| You really should call Bruce about this. I've talked with him about it and there may be a little twist to the story rather than just knowing a standard die size. I've tryed drilling the little hole on the other end to move the roll pin and that's not that easy for us average guys either. Something I have considered is if there may be a metric size that would work? The nylon nut makes its own threads when you screw it on. Call Bruce, he's a good un. |
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Tony Glassman
From:
The Great Northwest
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Posted 30 Mar 2008 9:12 am
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| Danny.......Thx. I will be calling Bruce on Monday. I'll post the outcome of that conversation. |
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Jerry Meek
From:
Colorado, USA
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Posted 30 Mar 2008 11:25 am Zum rod sizes
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Tony
I talked to Bruce at the Texas show and he told that the rods have raised threads and have to be the right length but if you could re-drill the end with the roll pin you wouldn't need to re-thread them. might be a job for a machine shop unless you have a good drill press and caliper to get exact sizing.You could call Bruce he would be happy to tell you the best way to go. Jerry |
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Danny Letz
From:
Old Glory,Texas, USA 79540
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Posted 30 Mar 2008 4:00 pm
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| I've tryed the drilling and I can hit one every now and then but not consistantaly. I think it takes some sort of fixture that someone familiar with machine work could do. Some of the problems I ran into is that a 1/16 bit is too flexible and a Harbor Freight drill press is not accurate enough. I had a small peice of angle iron clamped in a drill press vice to center the rod. Like I said I could hit one every now and then, but Bruce nailed every one dead center. |
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Erv Niehaus
From:
Litchfield, MN, USA
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Posted 31 Mar 2008 6:52 am
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Take something and flatten the end of the rod somewhat where you want to drill the hole. It will keep the drill bit from dancing around.
Last edited by Erv Niehaus on 31 Mar 2008 10:12 am; edited 1 time in total |
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Doug Earnest
From:
Branson, MO USA
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Posted 31 Mar 2008 10:07 am
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| 5-40 |
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Tony Glassman
From:
The Great Northwest
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Posted 31 Mar 2008 1:50 pm
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Just spoke w/ Bruce......Doug's right......the original thread is a 5-44 (expandable), but a 5-40 will work, as long as it is not a fixed dye.
Bruce uses .125" rod which he says is to too small for 6-40 and slightly too large for 5-40. Hence the need for an expandable dye. Either an expanded 5-40 or tightened 6-40 dye will work.
(I wasn't even aware of expandable vs. fixed dyes.......so, it's back to the hardware store for me!) |
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Erv Niehaus
From:
Litchfield, MN, USA
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Posted 31 Mar 2008 2:01 pm
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Tony,
You might not find that kind of die at a hardware store. It is the kind of die with an adjustment screw that you can turn to make it smaller or larger.
You might have to contact a machine tool company. |
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Tony Glassman
From:
The Great Northwest
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Danny Letz
From:
Old Glory,Texas, USA 79540
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Posted 31 Mar 2008 6:45 pm
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| That is exactly the little twist I was talking about. I just wanted you to get it directly from him in case I misunderstood and I wasn't sure if it was to be public knowledge. Good luck with your project. I had a friend get me a 6-40 and it had the little screw to spread or contract the die. I guess now we'll hunt up a 5-40 with the screw for future projects. |
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ken collins
From:
Oklahoma City, OK.
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Posted 2 Apr 2008 11:06 am thread size
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| 5-44 |
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