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Offline Michael4  
#1 Posted : 31 January 2019 10:44:10(UTC)
Michael4

United Kingdom   
Joined: 02/02/2017(UTC)
Posts: 642
Location: England, South Coast
Has anyone devised an effective way of straightening plastic catenary masts once they have been bent or warped by incorrect tension?

And...for that matter...is there a trick to straightening wires that are a bit bent?
Offline Drongo  
#2 Posted : 31 January 2019 11:14:31(UTC)
Drongo

Australia   
Joined: 03/06/2008(UTC)
Posts: 1,226
Location: Sydney, NSW
I had 40 years in the plastics industry and I might have the solution for you. When we wanted to mould plastic sheets, we heated them in an oven and then formed them to shape. So, my suggestion is to apply some heat to the masts and then straighten them and allow to cool. They should remain straight.

Now the trick is to apply the correct amount of heat - too little heat and the mast won't straighten. Too much heat and the mast will melt and badly distort . So, you'll have to experiment and I'm sure this will help.

Let us know how you go.

Regards
Greg
Take it easy . . . . or any other way you can get it !!!!
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Offline Tom Jessop  
#3 Posted : 31 January 2019 21:47:35(UTC)
Tom Jessop

Australia   
Joined: 14/12/2002(UTC)
Posts: 800
Location: Newcastle NSW Australia




Bent Catenary : You need a pair of bent duckbill pliers , these do not have serrations on the inside of the jaws & are very smooth instead almost to a high polished state Try at your local electrical wholesale supplier or similar as these were a specialist tool used by telephone technicians , may be rather hard to find these days as there are no electro mechanical exchanges in use anymore . The pliers are the normal shape at the handle end & the jaw ends protrude about 25mm from the hinge & then shaped at a right angle with the flat blades part of the jaw .

I have a pair somewhere in the garage from when I was a old school technician , will see if I can find them . In use hold one end with a pair of pliers then stroke the rest of the catenary with the duckbills to remove kinks & bends . I think your biggest problem will be obtaining the tool but maybe try a ex BT technician who is retired , might be like finding chook teeth .


Cheers Tom in Oz .
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Offline Minok  
#4 Posted : 31 January 2019 22:08:06(UTC)
Minok

United States   
Joined: 15/10/2006(UTC)
Posts: 2,311
Location: Washington, Pacific Northwest
And for straightening wire, the one method is to apply pulling tension in a short but strong burst, to pull them straight (pull out the kink). It requires securing one end to a very solid immobile object and grabbing the other end with good pliers and giving the wire a very good and strong yank.
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Offline W3Machinist  
#5 Posted : 01 February 2019 00:31:31(UTC)
W3Machinist

United States   
Joined: 19/01/2019(UTC)
Posts: 37
Location: North Carolina, Locust
Originally Posted by: Tom Jessop Go to Quoted Post




Bent Catenary : You need a pair of bent duckbill pliers , these do not have serrations on the inside of the jaws & are very smooth instead almost to a high polished state Try at your local electrical wholesale supplier or similar as these were a specialist tool used by telephone technicians , may be rather hard to find these days as there are no electro mechanical exchanges in use anymore . The pliers are the normal shape at the handle end & the jaw ends protrude about 25mm from the hinge & then shaped at a right angle with the flat blades part of the jaw .

I have a pair somewhere in the garage from when I was a old school technician , will see if I can find them . In use hold one end with a pair of pliers then stroke the rest of the catenary with the duckbills to remove kinks & bends . I think your biggest problem will be obtaining the tool but maybe try a ex BT technician who is retired , might be like finding chook teeth .


Cheers Tom in Oz .


You could also try vise grip type pliars with sheet metal jaws. These are wide (about 3" wide and 1 1/2" deep. estamated) and flat and smooth inside.

A roller on a hard flat surface will work also. Lay the catenary with the bend up, and roll. Too much pressur and it will curve the other way, so it will take some practice.

Good luck,
Woody Cool Mellow BigGrin
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