Mag loop bender

[cheng076]

Bending tube for Mag loop.
Simplest way is to get a piece of plywood about 3' to 4' square. Cut an arch of 18" in a 2" x 6" or 2" x 8" and nail it to the plywood. Next cut an another arch from plywood of about 19" or 19 1/2" and nail it to the other arch forming a channel. Use the channel as a bending guide to slowly bring the tube into shape.

PJH, N7PXY
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[Elecraft mailing list]

OK,  enough,
If you don't want any kinks in it.  You should slowly fill the tube with DRY sand and tap it until it it is packed full THEN proceed with the bending.    IF you have packed the sand tightly the bend will resist kinking.  I have used this for bending tubing over a pulley with good results.  The pulley for the bend radius you need should to be progressive from large to final. For me it took three sizes to get to the final radius without kinks.  Works with aluminum and copper.  Does not work on conduit.

Mel, K6KBE


      From: P.J.Hicks <[hidden email]>
 To: ELECRAFT <[hidden email]>
 Sent: Tuesday, October 4, 2016 3:33 PM
 Subject: [Elecraft] Mag loop bender
   
Bending tube for Mag loop.
Simplest way is to get a piece of plywood about 3' to 4' square. Cut an arch of 18" in a 2" x 6" or 2" x 8" and nail it to the plywood. Next cut an another arch from plywood of about 19" or 19 1/2" and nail it to the other arch forming a channel. Use the channel as a bending guide to slowly bring the tube into shape.

PJH, N7PXY
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[NK7Z]

On Tue, 2016-10-04 at 22:33 +0000, P.J.Hicks wrote:
> Bending tube for Mag loop. 
> Simplest way is to get a piece of plywood about 3' to 4' square. Cut
> an arch of 18" in a 2" x 6" or 2" x 8" and nail it to the plywood.
> Next cut an another arch from plywood of about 19" or 19 1/2" and nail
> it to the other arch forming a channel. Use the channel as a bending
> guide to slowly bring the tube into shape. 
>
> PJH, N7PXY 

Hello, 

Here is how I make loops...  I had a friend bend a nice loop out of
large diameter electrical conduit into a three foot circle, offsetting
the ends by one inch where they would come together. 

I then feed the copper tube into one end of the conduit, and force it
through the conduit by hand.  As I said, the ends of the conduit are
offset from each other by about an inch, so when the copper comes out of
the other end, I just pull the loop out...  

Poof, one finished loop, no sharp bends, and I can make loops all day,
each one exactly the same as the first.

--
73's, and thanks,
Dave (NK7Z)
For software/hardware reviews see:
http://www.nk7z.net

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[cheng076]

My bad....forgot to mention the sand.

PJH

----- Original Message -----

OK, enough,

If you don't want any kinks in it. You should slowly fill the tube with DRY sand and tap it until it it is packed full THEN proceed with the bending. IF you have packed the sand tightly the bend will resist kinking. I have used this for bending tubing over a pulley with good results. The pulley for the bend radius you need should to be progressive from large to final. For me it took three sizes to get to the final radius without kinks. Works with aluminum and copper. Does not work on conduit.


Mel, K6KBE




From: P.J.Hicks <[hidden email]>
To: ELECRAFT <[hidden email]>
Sent: Tuesday, October 4, 2016 3:33 PM
Subject: [Elecraft] Mag loop bender

Bending tube for Mag loop.
Simplest way is to get a piece of plywood about 3' to 4' square. Cut an arch of 18" in a 2" x 6" or 2" x 8" and nail it to the plywood. Next cut an another arch from plywood of about 19" or 19 1/2" and nail it to the other arch forming a channel. Use the channel as a bending guide to slowly bring the tube into shape.

PJH, N7PXY
______________________________________________________________
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