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Re: [TowerTalk] Can type 31 cores be cut in half ?

To: Jim Thomson <jim.thom@telus.net>, towertalk@contesting.com
Subject: Re: [TowerTalk] Can type 31 cores be cut in half ?
From: Grant Saviers <grants2@pacbell.net>
Date: Tue, 5 Jul 2016 06:58:31 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Yes it is possible with a diamond saw in a surface grinder. However, it is very messy and and the dust/slurry is very abrasive so the grinder owner may say "no way". We machined a lot of ferrite many years ago for recording heads and pretty quickly the grinders were trashed.

You need very flat and smooth mating surfaces (see a big clamp on) as this mating changes the magnetic properties of the core by inserting an air gap. Obvious it can be made to work since #31 clamp ons are very effective if kept tightly closed. A tungsten carbide blade will cut ferrite in your bandsaw but I think the cut will be so rough as to be useless. A diamond blade in a cut off saw may work if it last long enough without water cooling.

I think you need a bigger NEMA enclosure as any of these techniques will cost a lot more with probably poor results.

Grant KZ1W

On 7/5/2016 6:05 AM, Jim Thomson wrote:
I have a one off application where I  want to get  1-2  additional 2.4 inch OD 
cores
onto coax,  but dont want to take the existing CMC assy all apart.  The big 
clamp
on is aprx  1.5 inches long..and is too long for this application.   It’s a 
tight squeeze inside the
nema box, and  coax is already  silver soldered at both ends  to both 
connectors.  Dual silver
braids have been separated at each end of the  RG-393 coax, and bonded to 7-16 
Dins.

Can a  type  31  2.4 inch OD core be cut clean in half....like in a bandsaw ?   
I have a
vertical bandsaw with a metal cutting blade in... with 3 x speeds,  80-120-200  
feet per
minute.   The idea here was..IF a core can be cut in half, to place the 2 x 
halves back around the
coax turns... and then either glue em back together..or  perhaps use a ty-rap  
around the circumference.

If cores cant be cut,  I will have to disassemble the entire assy, and start 
from scratch, which Id
rather not have to do, pita.

Jim   VE7RF
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