Look at http://www.fair-rite.com/newfair/faqfer.htm
With shrinkages of 10-17% in all 3 dimensions the yield must not be
great especially for the large parts. However parts that I thought were
expensive became quite reasonable when the quantities went up. I only
have a single data point but a part that I used which was about $.75ea
when purchased from distribution was about $.15ea at quantities of
5000. Maybe the purchasing agent was very good or that this is the
typical quantity price break.
Larry, W0QE
On 11/3/2010 12:16 PM, Jim Brown wrote:
> On 11/3/2010 10:54 AM, doc@kd4e.com wrote:
>> I am curious. What is it about the content and manufacturing
>> of toroids that makes them so expensive?
>>
> I don't know anything about the manufacturing process so can only guess.
> Here are some obvious things that come to mind.
>
> They are quite brittle, so breakage is an issue with handling, and
> especially with packing and shipping. This increases cost.
>
> Every single must be produced individually -- that is, you can't make a
> big one and cut into little pieces.The clamp-on parts must mate VERY
> closely, so their mating surfaces must be VERY smooth.
>
> Each mix is a different chemical structure, and I suspect that small
> changes in the formula and in the production process must be avoided to
> maintain consistent electrical properties. It may also be expensive to
> do this.
>
> Based on the above, there may be yield and quality control issues.
>
> 73, Jim K9YC
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