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Four Stroker

Elite Veteran

Atlanta

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The grass reached up and grabbed my heli when I was doing a sliding auto today and bent two head rods. I threaded some old M2 rod and discovered that it is too small for Align links ! I used some old Kalt rods which are supposed to be M2.3 and had to drill out the Align links.

Did anyone ever find a source for an M 2.3 die and appropriate rod ?

07-04-2016 07:28 PM
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Dr.Ben

rrMaster

Richmond, VA, USA

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For just two rods would changing balls and links to a 2.5mm link and turnbuckle arrangement be less costly and troublesome?

The problem Richard is that quality rods use rolled threads and are always oversize for the stated thread. For example, rolled thread 2mm typically won't thread into a 2mm nut. Cut threaded rods, especially in the 2mm range, are prone to breaking at the point where the threads end and solid rod begins.

Ben Minor

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07-04-2016 08:13 PM
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Four Stroker

Elite Veteran

Atlanta

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Ben;

I have so much stuff that I forget about it. I have 6 feet of 2.36 mm stainless rod which threads nicely with an M2.5 die. The Align and other links can be drilled out to accept this rod. An actual M2.5 bolt measures 2.42 mm so for threading into plastic links all is well. Haven't tried M2.5 nuts. Probably kind of floppy.

Thanks anyway.

07-04-2016 08:29 PM
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John Benario

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Las Vegas

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Any rod that is soft enough to thread will not be strong enough to trust, especially with current flying styles.

Years ago I bought a complete assortment of JR pushrods for just your situation in that I always had spares for a minor incident.

The JR wire is high quality metal, and the thread is between 2.2 and 2.3 mm and fit just about every brand ball link. I do recall the Kalt threads being slightly larger than the standard at about 2.3 mm.

I agree with Ben, stay away from cut threads. Terry Moore can provide more insight into cut vs rolled threads.

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07-05-2016 12:06 AM
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Four Stroker

Elite Veteran

Atlanta

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John;

How did you wind up in Las Vegas ? This must be old guy's day at RR.

I found some "water hardenable" rod at McMaster. I suppose you could cut the threads and then harden the rod ?

Actually my flying style is very mild. The soft Kalt rods bent and saved everything else. Took out one servo first gear when the blades folded. Did not hurt the blades - maybe 1000 rpm at landing. But I am out of Kalt rods !

07-05-2016 01:20 AM
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helifanatix

Veteran

Fountain Valley, CA

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You can use mikado M2.5 linkages
- various sizes 30mm ~ 70mm
- put in on a drill
- spin the linkages against a file
- do it slowly to make sure you don't take off too much
- that should take M2.5 down to M2.3

- Scott

07-05-2016 01:37 AM
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Four Stroker

Elite Veteran

Atlanta

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Ben and John are correct in that a rolled thread rod that is then hardened is much stronger than a threaded rod. For example the Concept 30 rods were much stronger than the XCell rods! The XCell rods were rolled but not hardened. On the other hand, how strong is the typical plastic link? What fails first? The link loop, the plastic threads or the rod?

If you have a 700~800 FBL 12S~14S with 500 in-oz servos and like to pitch pump, you should definitely NOT MAKE YOUR OWN LINKS. This is the responsible position for an expert on RR to take.

On the other hand, if you have a Raptor 30 FB antique and M2.5 threaded rods, it is doubtful that the rod will break - before the link.

Both the rod and die sold long ago to make your own M2 rods were crap.

07-05-2016 02:09 PM
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Ace Dude

rrProfessor

USA

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Many years ago I purchased the hardening rod recommended by Rocket City from McMaster. I forget whether it was air or water hardening rod. I made a few links for my Shuttle. In the end it was hardly worth the effort and I never did it again.

  

07-05-2016 02:52 PM
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helifanatix

Veteran

Fountain Valley, CA

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You can harden the rod yourself
- apply heat till it glows orange
- drop it in oil

* you can weaken the metal if heated too long.

I had M2.5 control rod snap in flight. It happen on the 2nd thread going from smooth portion thread. Bird had no more than an hr of total operation. Now in a big user of titanium turn buckles for anything bigger than 600mm blades.

- Scott

07-05-2016 03:37 PM
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Four Stroker

Elite Veteran

Atlanta

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These rods were made by M2.5 threading precision ground polished 3/32 stainless rod from McMaster. I would use them on any heli without fear of breaking.

On the other hand, they were so much trouble to make that I would not do it again. So I took John's advice and ordered a wad of JR rods. Unfortunately many sizes are OUT OF STOCK.

07-06-2016 05:16 PM
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