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Clevis, Thead, Crimp, Glue or Solder

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Christopher Morris 229/03/2020 08:38:23
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169 forum posts

Hi, had to make up some 2mmX800mm control rods & have had a devil of a time threading one end for a clevis. Do you guys find threading crimp, glue or solder the best & strongest way. I was only looking at a thread for a bit of fine adjustment at one end & easy replacement if needed..

Edited By Christopher Morris 2 on 29/03/2020 08:38:47

Peter Miller29/03/2020 09:36:11
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10959 forum posts
1272 photos
10 articles

If you are trying to cut a thread in piano wire...forget it!!

Buy 2mm solder extenders from SLEC (Or elsewhere) and solder them on.

 

Edited By Peter Miller on 29/03/2020 09:36:35

Ron Gray29/03/2020 09:37:10
1920 forum posts
799 photos

I use these SLEC

 

(Peter beat me to it!)

Edited By Ron Gray on 29/03/2020 09:37:37

Christopher Morris 229/03/2020 10:21:34
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169 forum posts

Thank guys, do you find a soldering iron ok or a small gas torch a bit better? Was just wondering if the heat will travel on a steel rod with an iron.

 

 

Edited By Christopher Morris 2 on 29/03/2020 10:22:43

Edited By Christopher Morris 2 on 29/03/2020 10:23:15

DaveyP29/03/2020 10:27:15
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225 forum posts
47 photos

I've always just used a soldering iron, on small 2mm stuff thumbs up

Solly29/03/2020 10:42:43
252 forum posts
1 photos

Heat the rod to a moderate red and allow to air cool. This will soften the metal enough to cut a thread. I've done this many times over the years and it works fine.

Christopher Morris 229/03/2020 10:42:57
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169 forum posts

Thanks, all ordered & wait to try them out yesyes

Stephen Jones29/03/2020 11:31:10
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2805 forum posts
1614 photos

I find bicycle spokes useful and easy to get they come in different lengths .

I find the stainless steel one good, Put a clevis on one end and a zed bend on the other.

as you can see here.

smlthrottle.jpg

And,

ftjoined.jpg

 

Steve

Edited By Stephen Jones on 29/03/2020 11:47:41

Peter Miller29/03/2020 12:10:03
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10959 forum posts
1272 photos
10 articles

I have never seen an 800 mm bicycle spoke.

A solderon iron is fine for soldering.I use a 40 watt Weller iron.

Heating the wire to red heat will work but it can cause a brittel section that will snap like a rotton carrot.

Redex29/03/2020 12:16:08
156 forum posts

I have used 30 min epoxy several times with rod/extenders and seems to work OK, just make sure surfaces are clean before applying epoxy

gangster29/03/2020 12:16:34
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1010 forum posts
17 photos

Bear in mind that the 2mm threaded rods that you buy from the model shop vary in diameter. Sure they all/ most fit a 2mm crevice or nut but the rod diameter varies. Not all threads are cut I’m the way you or I might do. I needed some threaded both ends for interplane struts and aeleron coupling. Had a good rummage round the odds box to find some that I could thread

kc29/03/2020 12:20:58
6423 forum posts
173 photos

The front wheels on Penny Farthings probably used 800mm spokes!

Threads on rods are often rolled not cut with a die, so the rod may well be less diameter than the thread that is formed on it.( somehow the rod is squeezed out to form thread rather than cut into the rod)

Edited By kc on 29/03/2020 12:21:21

gangster29/03/2020 12:26:37
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1010 forum posts
17 photos

Also be careful of anything American eg Sullivan or great planes. They use imperial threads

Christopher Morris 229/03/2020 12:48:50
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169 forum posts

Be nice if there was an inexpensive thread rolling machine like they make most bolts & studding from. Something along the style of a pencil sharpener.
But, i will go down the solder route.

Bruce Collinson29/03/2020 13:16:27
515 forum posts

What’s wrong with purpose made pushrod, with thread on one end, Z bend on the other? Fairly inexpensive from all the usual UK suppliers, M2, 2.5 and 3 freely available, as are locknuts for additional security. If one end of the rod is fixed, e.g. Z bend, it can’t rotate anyway.

Agree with Gangster re variable thread sizes. My preference is for relatively long clevises, Kavan e.g., aiming to have the entire clevises thread filled by the rod thread and if they get too short I make up another one. Then it’s threadlocked and has fuel tube over the clevises arms pushed close to the control horn to prevent springing off.

The only failure I’ve had was clevises from an ARTF Yak where the pins were weak, luckily failing prior to maddening, so I threw them all out.

BTC

cymaz29/03/2020 13:27:54
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9196 forum posts
1186 photos

For 2mm rods the solder extenders are great. If you can't or are not good at doing Z bends try using a simple U shape for the other end

Edited By cymaz on 29/03/2020 13:28:13

Christopher Morris 229/03/2020 14:03:54
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169 forum posts
Posted by Bruce Collinson on 29/03/2020 13:16:27:

 

What’s wrong with purpose made pushrod, with thread on one end, Z bend on the other? Fairly inexpensive from all the usual UK suppliers, M2, 2.5 and 3 freely available, as are locknuts for additional security. If one end of the rod is fixed, e.g. Z bend, it can’t rotate anyway.

Agree with Gangster re variable thread sizes. My preference is for relatively long clevises, Kavan e.g., aiming to have the entire clevises thread filled by the rod thread and if they get too short I make up another one. Then it’s threadlocked and has fuel tube over the clevises arms pushed close to the control horn to prevent springing off.

The only failure I’ve had was clevises from an ARTF Yak where the pins were weak, luckily failing prior to maddening, so I threw them all out. But 2mm plain rods are no problem. Maybe i'm not looking in the right places.

BTC

 

The main problem was finding a UK shop that sold 800mm & longer 2mm rods with a thread. But plain 2mm rods are no problem. Might be unlucky in where i am looking.

Edited By Christopher Morris 2 on 29/03/2020 14:05:19

Edited By Christopher Morris 2 on 29/03/2020 14:07:23

brokenenglish29/03/2020 15:00:14
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550 forum posts
29 photos

I've more or less stopped using clevises. Unless absolutely impossible, I use a Z bend at the control horn end and a smaller sliding clamp (stopper) in the servo arm, which has the added advantage of reducing weight at the rear of the fus.

Tim Ballinger29/03/2020 15:33:32
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778 forum posts
283 photos

Just been fitting rods to the end of snake inners and ball clevis’s using the aforementioned 2 mm threaded rods. These are soft and threads cut easily if required. I find the rods just the right diameter for screwing into the inner but of course a 2mm die is too large. Being old and grey I still have some BA dies and an 8BA cuts just enough thread to make a good screw fit into the inner. The rolled 2mm threaded end screws into the 2mm ball clevis as is.

I suppose I could buy a smaller metric die but in this case ‘old’ money works just as well.

Tim

Mark H7529/03/2020 15:57:27
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7 forum posts
Posted by Christopher Morris 2 on 29/03/2020 14:03:54:
Posted by Bruce Collinson on 29/03/2020 13:16:27:

What’s wrong with purpose made pushrod, with thread on one end, Z bend on the other? Fairly inexpensive from all the usual UK suppliers, M2, 2.5 and 3 freely available, as are locknuts for additional security. If one end of the rod is fixed, e.g. Z bend, it can’t rotate anyway.

Agree with Gangster re variable thread sizes. My preference is for relatively long clevises, Kavan e.g., aiming to have the entire clevises thread filled by the rod thread and if they get too short I make up another one. Then it’s threadlocked and has fuel tube over the clevises arms pushed close to the control horn to prevent springing off.

The only failure I’ve had was clevises from an ARTF Yak where the pins were weak, luckily failing prior to maddening, so I threw them all out. But 2mm plain rods are no problem. Maybe i'm not looking in the right places.

BTC

The main problem was finding a UK shop that sold 800mm & longer 2mm rods with a thread. But plain 2mm rods are no problem. Might be unlucky in where i am looking.

Edited By Christopher Morris 2 on 29/03/2020 14:05:19

Edited By Christopher Morris 2 on 29/03/2020 14:07:23

I've used these guys before to get 1 metre lengths **LINK** so I can make custom lengths and cut a thread at both ends.

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