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

[Grant Saviers]

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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