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Advice in cold bending rod #7620693
07/06/22 02:20 PM
07/06/22 02:20 PM
Joined: Jul 2013
Posts: 8,346
Amite county Mississippi
Wolfdog91 Offline OP
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Wolfdog91  Offline OP
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Amite county Mississippi
Anyone got some advice when it comes to cold bending rod ? I've been having problems making trap frames. Basically I'll make my cages wire body then I'll measure the inside and try and make my frames. So say my cage needs a frame thats 7"x10". Well just marking the rod @7" then 17 ect then trying to being that just never seems to work right. Seems the best way to do it just keep bending till I get something right then kinda go off of that but there still seems to be alot of extra"art" to this. Not it mention it took me like half an hour to get everything just right .
Is there some kinda calculation a guy could do to get a perfect ( or just a really nice) bend ? Or anyone got a video that really getting into making precise cold bends ? Would really like to be able to sit down lay out what I want then be able to bend it right the first go.

[Linked Image]
[Linked Image]

Thanks !


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Re: Advice in cold bending rod [Re: Wolfdog91] #7620697
07/06/22 02:28 PM
07/06/22 02:28 PM
Joined: Dec 2010
Posts: 8,264
Nebraska, Dawson County
chas3457 Offline
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Practice practice practice. smile


Put it in the vice and bend it. If it doesn't line up with your mark, adjust your mark on the next one, till you get it right.


Build your self a bending machine. No doubt in my mind that you can do that cool



Charlie


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Re: Advice in cold bending rod [Re: Wolfdog91] #7620700
07/06/22 02:33 PM
07/06/22 02:33 PM
Joined: Sep 2013
Posts: 13,282
Green County Wisconsin
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GREENCOUNTYPETE Offline
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Green County Wisconsin
if you measure mark and bend then measure where you actually came to

so say you measure 7 mark and bend over the vice what does it actually come to 7 1/4 what ever it comes to I would think you need to take off the 7

so say it is 7 1/4 you would take the 1/4 off and mark at 6 3/4 so that bent it is 7

your making a radius so figuring in for the radius is necessary when I was bending a lot of conduit I knew what my measurement was , I don't recall all these years later

a couple test bends should tell you


America only has one issue, we have a Responsibility crisis and everything else stems from it.
Re: Advice in cold bending rod [Re: Wolfdog91] #7620712
07/06/22 02:49 PM
07/06/22 02:49 PM
Joined: Dec 2014
Posts: 2,607
E central Il
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Golf ball Offline
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If you have a heavy welding table and your cages are the same size every time the simple answer is build a jig on your table . It might take a time or two to get it right but once you’ve got it your golden for the duration.

I would think if your cages are 7”x10” it would be a matter of building the jig a quarter inch smaller ( depending on rod size ) say 6” 3/4 x 9” 3/4 and 6”3/4 x 9”3/4 , weld 4 pieces of angle on the welding table and start bending. That’s assuming your using 3/16” rod .

Re: Advice in cold bending rod [Re: Wolfdog91] #7620714
07/06/22 02:54 PM
07/06/22 02:54 PM
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Posts: 18,509
St. Louis Co, Mo
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BigBob Online mad
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You're going at it from the wrong side. Make the frame FIRST, then make the body wire fit it. Don't forget you can get sharper corners with hardware cloth body material, than with the frame material.


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Re: Advice in cold bending rod [Re: Golf ball] #7620716
07/06/22 02:56 PM
07/06/22 02:56 PM
Joined: Jul 2013
Posts: 8,346
Amite county Mississippi
Wolfdog91 Offline OP
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Wolfdog91  Offline OP
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Amite county Mississippi
Originally Posted by Golf ball
If you have a heavy welding table and your cages are the same size every time the simple answer is build a jig on your table . It might take a time or two to get it right but once you’ve got it your golden for the duration.

I would think if your cages are 7”x10” it would be a matter of building the jig a quarter inch smaller ( depending on rod size ) say 6” 3/4 x 9” 3/4 and 6”3/4 x 9”3/4 , weld 4 pieces of angle on the welding table and start bending. That’s assuming your using 3/16” rod .


Well that's the thing I'm probably going to be making cages that are all over the place as far as measurements lol. Really looking at making jigs however.think I'll go buy th school and see if my old welding teacher has some scrap plate I can get . Now what you said about building it smaller is what got me. You said build it 1/4" smaller if I was using 3/16. Why exactly? Wouldn't I bud then 3/16th smaller ? And since I'm building thea out of 1/4 would I build them 1/2 smaller ??


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Re: Advice in cold bending rod [Re: Wolfdog91] #7620806
07/06/22 05:48 PM
07/06/22 05:48 PM
Joined: Dec 2020
Posts: 658
Wisconsin
Scott__aR Offline
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Wisconsin
Wolfdog91, yes there are formulas for developing length adjustments for the bend radius. Unfortunately my engineering resources are all packed up in storage.

For each bend the allowance will always be shorter based on: the elongation material properties of the rod you are bending, size of the bend radius, rod diameter, and the amount that the neutral axis moves from the theoretical bend axis due to compression around the inner material fibers and tension ( stretch) in the outer material fibers (think of the rod as being made up of laminated layers of material.)


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Re: Advice in cold bending rod [Re: Wolfdog91] #7620809
07/06/22 05:50 PM
07/06/22 05:50 PM
Joined: May 2013
Posts: 4,835
Northern Michigan
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J.Morse Offline
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Northern Michigan
Wolfie, why do you have to do it cold? Couldn't you use a small torch (map gas would be quite fast) to heat the small spot you want to bend, then quickly get it in a good vise and hammer it over before all the "red" is out of it.


Re: Advice in cold bending rod [Re: Wolfdog91] #7620948
07/06/22 08:49 PM
07/06/22 08:49 PM
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Posts: 1,727
North Central Idaho
Jumperzee Offline
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Wolfie do they have to be bent? Along the lines of above questions, why not just cut everything and build a little fixture plate to tack it all together?

Re: Advice in cold bending rod [Re: Wolfdog91] #7620961
07/06/22 09:11 PM
07/06/22 09:11 PM
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The great cage state Colorado
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Monster Toms Offline
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The great cage state Colorado
First question, What are you bending the rod with??






Re: Advice in cold bending rod [Re: Jumperzee] #7620968
07/06/22 09:32 PM
07/06/22 09:32 PM
Joined: Mar 2017
Posts: 63
Eastern Washington
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TEpnw Offline
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Originally Posted by Jumperzee
Wolfie do they have to be bent? Along the lines of above questions, why not just cut everything and build a little fixture plate to tack it all together?

I’ve done this on my swimthrough cages and it works quite well!

Re: Advice in cold bending rod [Re: Monster Toms] #7620978
07/06/22 09:41 PM
07/06/22 09:41 PM
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Iowa
~ADC~ Offline
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Iowa
Originally Posted by Monster Toms
First question, What are you bending the rod with??


I have a pair of bolt cutter that have a bender built in that work awesome. I don't know if anyone makes them anymore. I have a huge rebar cutter too that has a bender on it but it's no good for real sharp bends or smaller stock like used in cage traps.

Bolt cutters are like these.... https://www.ebay.com/itm/363870976527?hash=item54b8667a0f:g:T7QAAOSwg2ViplEv

Last edited by ~ADC~; 07/06/22 09:53 PM. Reason: added link
Re: Advice in cold bending rod [Re: Jumperzee] #7621005
07/06/22 10:28 PM
07/06/22 10:28 PM
Joined: Jul 2013
Posts: 8,346
Amite county Mississippi
Wolfdog91 Offline OP
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Wolfdog91  Offline OP
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Amite county Mississippi
Originally Posted by Jumperzee
Wolfie do they have to be bent? Along the lines of above questions, why not just cut everything and build a little fixture plate to tack it all together?

Well I've always hav just cut and welded but I kinda wanna get good and bending. Seems every cage maker worth their salt does it so it's something I'd really like to get a good grasp on. Also since I'm running a stick it's a literal nice to just make one weld instead of four


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Re: Advice in cold bending rod [Re: Monster Toms] #7621008
07/06/22 10:29 PM
07/06/22 10:29 PM
Joined: Jul 2013
Posts: 8,346
Amite county Mississippi
Wolfdog91 Offline OP
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Wolfdog91  Offline OP
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Amite county Mississippi
Originally Posted by Monster Toms
First question, What are you bending the rod with??

A vice and a hammer. I tried using I pice of tubing slipped of my rod like a cheater bar but my beinds never looked quite right


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Re: Advice in cold bending rod [Re: J.Morse] #7621012
07/06/22 10:36 PM
07/06/22 10:36 PM
Joined: Jul 2013
Posts: 8,346
Amite county Mississippi
Wolfdog91 Offline OP
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Wolfdog91  Offline OP
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Amite county Mississippi
Originally Posted by J.Morse
Wolfie, why do you have to do it cold? Couldn't you use a small torch (map gas would be quite fast) to heat the small spot you want to bend, then quickly get it in a good vise and hammer it over before all the "red" is out of it.

Well I just doing it cold right now because I don't have an oxy torch yet. I haven't tried map yet for this, how fast is it compared to oxy ?

But even then I will kinda stuck on properly laying stuff out for a bend


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Re: Advice in cold bending rod [Re: Wolfdog91] #7621019
07/06/22 10:48 PM
07/06/22 10:48 PM
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Posts: 1,316
SE Minnesota
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dustytinner Offline
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[Linked Image]

Work great


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Re: Advice in cold bending rod [Re: Wolfdog91] #7621026
07/06/22 11:01 PM
07/06/22 11:01 PM
Joined: Dec 2006
Posts: 6,865
MN >>>
T-Rex Online content
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Congratulations. It sounds like you have discovered "bending gain".

While I cannot disclose what cost me hundreds of dollars in class courses and experience I will say there is a factor, and it is dependent on radius.

If you figure it out feel free to let some of the other folks on here in on your discovery.

Hint: Perhaps the factor .44 could come into play


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Re: Advice in cold bending rod [Re: Wolfdog91] #7621027
07/06/22 11:01 PM
07/06/22 11:01 PM
Joined: May 2010
Posts: 2,438
The great cage state Colorado
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Monster Toms Offline
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Re: Advice in cold bending rod [Re: Monster Toms] #7621033
07/06/22 11:05 PM
07/06/22 11:05 PM
Joined: Jul 2013
Posts: 8,346
Amite county Mississippi
Wolfdog91 Offline OP
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Wolfdog91  Offline OP
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Amite county Mississippi
Originally Posted by Monster Toms


Actually I've had three of these now , learned don the first two they really don't like 1/4" rod lol


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Re: Advice in cold bending rod [Re: T-Rex] #7621035
07/06/22 11:06 PM
07/06/22 11:06 PM
Joined: Jul 2013
Posts: 8,346
Amite county Mississippi
Wolfdog91 Offline OP
trapper
Wolfdog91  Offline OP
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Amite county Mississippi
Originally Posted by T-Rex
Congratulations. It sounds like you have discovered "bending gain".

While I cannot disclose what cost me hundreds of dollars in class courses and experience I will say there is a factor, and it is dependent on radius.

If you figure it out feel free to let some of the other folks on here in on your discovery.

Hint: Perhaps the factor .44 could come into play


A hint ! Awsome that's all I need grin now off to YouTube I go !


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MS National Guardsmen
I Like Moddin Traps 'N Trapping Possums
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