[Milsurplus] [spam] Re: BC-669 connector
Michael Hanz
aaf-radio-1 at aafradio.org
Fri Nov 6 18:29:38 EST 2026
Actually, your drill press is probably fine, Jim. It can be old and
crappy. No bells or whistles required.
With the power off, just bring the center drill down in gentle contact
with the hole to be enlarged and put a clamp on the connector to keep it
from spinning. Then start the motor (lowest speed if you have the
ability) and gently feed the center drill down into the connector,
raising it out of the connector frequently to blow the swarf out of the
hole you are enlarging. Oh - try not to position the connector where the
drill will be drilling down into the steel of the table - put it over an
existing hole... I can't say I have always followed that rule, but
that's what learning experiences are all about. 😂
Easy peasy.
On 11/6/2026 5:50 PM, Jim Whartenby via Milsurplus wrote:
> Mike, long time, no "see"!
> All you say is true if one has a milling machine with all of the bells
> and whistles that you would need. My drill press is certainly not up
> to this task.
>
> Considering setup time and such, perhaps the time needed to widen
> three holes with a Swiss file versus machining would be a wash.
>
> Ever find the time to make that mount for your ARC-65?
> Regards,
> Jim
>
> *Logic is a systematic method of coming to the wrong conclusion with
> confidence.* *Murphy*
>
>
> On Friday, November 6, 2026 at 12:28:16 PM CST, Michael Hanz
> <aaf-radio-1 at aafradio.org> wrote:
>
>
> Sorry, that ought to be a #1 center drill. My brain went south
> for a minute there.
>
> On 11/6/2026 1:09 PM, Michael Hanz via Milsurplus wrote:
>>
>> With a tapered file, /lots/ of effort.
>>
>> With a #3 center drill, you can drill out the smaller hole and
>> leave it with the correct .125" sleeve size for the connector
>> pin. Use lots of lubricant. More importantly, it will maintain
>> the center location of the original hole, a process that is
>> almost impossible using a tapered file. (I've tried...)
>>
>> 73,
>> Mike KC4TOS
>>
>> On 11/6/2026 3:10 AM, Jim Whartenby via Milsurplus wrote:
>>> Robert
>>> How much effort do you think would be required to open up those
>>> three #16 contacts in a 28-8P connector to accept #12 contacts
>>> using a tapered Swiss file? A half day's work versus patiently
>>> waiting for a couple of years seems worthwhile, doesn't it?
>>> Regards,
>>> Jim
>>>
>>> *Logic is a systematic method of coming to the wrong conclusion
>>> with confidence.* *Murphy*
>>>
>>>
>>> On Thursday, November 5, 2026 at 07:43:14 PM CST, Robert Goff
>>> <robert.h.goff at gmail.com> <mailto:robert.h.goff at gmail.com> wrote:
>>>
>>>
>>> Seems like this subject comes up every few years.
>>> Here is Robert Down's response to me back in 2012:
>>> ________________________________
>>>
>>> Sorry, but the connectors are NOT AN 3108-28-8S or P. They
>>> are actually AN
>>> 3108-28-767S or P. Which were custom modified from the
>>> 28-8. That's why
>>> they are so difficult to find. Amphenol does not appear to
>>> have actually
>>> made any -28-767 inserts. To add to the confusion, most if
>>> not all of the
>>> modified inserts that I have seen still have -8 molded into
>>> the face. The -767
>>> was only marked on the barrel (and not on all of them,
>>> either). The
>>> difference is that the 28-8 has 10 #16 and 2 #12 contacts.
>>> The 28-767
>>> has 5 #12.
>>> three of the holes for the #16 (A,B,C) were bored out for #12.
>>>
>>>
>>> I think Bill Perry has been sold out of the proper connector
>>> for at
>>> least 15 years. I finally did find an original cable just by
>>> patiently
>>> watching ebay. It took a couple years and shipping from
>>> Italy, but I
>>> got it.
>>> Good Searching,
>>> 73,
>>> de Robert W7MKA
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