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

[Patrick Greenlee]

A tile saw with diamond blade and water flow on the cut such as tile 
installers use is available in different styles inexpensively from 
Harbor Freight.

Patrick        NJ5G


On 7/5/2016 8:58 AM, Grant Saviers wrote:
> 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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