[ARC5] Command Set Shaft Collar Nut (WARNING)

Wed Apr 12 20:29:32 EDT 2017

   General notice:

   A close match to this 27 tpi thread is commonly available: 1/2 inch
   28 turns per inch.
   A nut with this thread will start BUT!

   DO NOT, repeat DO NOT attempt to match the (correct) 27tpi thread on
   your radio with a 28tpi thread.
   You WILL ruin the aluminum thread on your radio.   

   73 de Les Smith

   vk2bcu at operamail.com

On Thu, Apr 13, 2017, at 07:20, Phillip Carpenter wrote:

> After taking some careful measurements, I have purchased the 1/2-27
> tap & die set from China via eBay. I also have discovered that a brass
> 5/16" compression cap will fit almost perfectly over the shaft collar,
> except for the threads.
> 

> I do intend to rethread the compression cap and try it. I'll let
> everyone here know whether it works OK or not. Should be in a couple
> of weeks (due to the time it takes to receive the tap & die from Hong
> Kong via ePacket).
> 

> Thanks for all the interesting replies!

> 

> Respectfully,

> 

> Phillip W4RTX 

> 

> Sent from my iPhone

> 

> On Apr 12, 2017, at 1:48 PM, Bruce Long via ARC5
> <arc5 at mailman.qth.net> wrote:
>> There are a number of 1/2-27 taps currently on USA Ebay including

>> Taps from China for $15.00 shipping included

>> 

>> http://www.ebay.com/itm/Tap-1-2-27-HSS-Right-hand-Tap-1-2-27-TPI-/302050492349?hash=item46539cbfbd:g:u-4AAOSwHoFXt~tp
>> 

>> 

>> 

>> **From:** Michael Hanz <aaf-radio-1 at aafradio.org> **To:** Leslie
>> Smith <vk2bcu at operamail.com>; arc5 at mailman.qth.net **Sent:**
>> Wednesday, April 12, 2017 1:06 PM **Subject:** Re: [ARC5] Command Set
>> Shaft Collar Nut
>> 

>> What about 

>> http://www.ebay.com.au/itm/1-2-x-27-uns-hss-plug-new-tap-/172586672791
>> 

>> It ships from Devon, but it appears to be free shipping to Australia.
>> 

>> On 4/12/2017 11:59 AM, Leslie Smith wrote:

>> >    Hello Bill,

>> >

>> >    I tried to buy a tapping tool for 1/2 inch 27 threads per inch
>> >    from my
>> >    local bicycle shop, and also at the largest tool supplier

>> >    (Blackwoods).   Nothing.

>> >

>> >     73 de Les Smith

>> >    vk2bcu at operamail.com

>> >

>> > On Wed, Apr 12, 2017, at 22:40, Bill Cromwell wrote:

>> >> Hi Les,

>> >>

>> >> On this continent (and probably all continents) the generation
>> >> that
>> >> designed those radios were much more familiar with bicycles
>> >> than the
>> >> present generation(s). And in the days when those designers were
>> >> growing
>> >> up and into their adult lives had a lot more hands-on experience
>> >> with
>> >> everything in their lives. Most of the people using bicycles
>> >> today pay
>> >> far too much for them and then can barely manage the simplest of

>> >> 'maintenance' - maybe washing and waxing and a drop of oil
>> >> here and
>> >> there. Bicycle shops that I know about are always busy keeping
>> >> this
>> >> generation's bicycle status symbols working. I'll stop in there
>> >> and ask
>> >> about 1/2-27 parts.

>> >>

>> >> 73,

>> >>

>> >> Bill  KU8H

>> >>

>> >> On 04/11/2017 07:46 PM, Leslie Smith wrote:

>> >>>    Threads on "command" radio receivers.

>> >>>    I refer to the thread used between the tuning system and the
>> >>>    receiver.
>> >>>    I measured the thread using a thread gauge.

>> >>>    I found the thread was 27 turns to the inch (and NOT 28 tpi)

>> >>>    Using Newnes Workshop Handbook I read that (1) the thread was
>> >>>    1/2
>> >>> inch cycle thread

>> >>>    (2) this thread was considered to resist "unwinding" due to
>> >>>        vibration.
>> >>>

>> >>>    That's all I know.

>> >>>    Except I thought it was very clever to use a thread that
>> >>>    resisted
>> >>> working free in equipment subject to vibration.

>> >>>    How did those radio guys know about bicycle threads?   Hmmm?

>> >>>

>> >>>     73 de Les Smith

>> >>>    vk2bcu at operamail.com

>> >>>

>> >>>

>> >>>

>> >>> On Wed, Apr 12, 2017, at 08:17, Phillip Carpenter wrote:

>> >>>> Mike,

>> >>>>

>> >>>> I was reading that website posting but it was unclear if the
>> >>>> ARC-5
>> >>>> receivers had the same thread. It looked like he was talking
>> >>>> about
>> >>>> ARB receivers.

>> >>>>

>> >>>> Phillip W4RTX

>> >>>>

>> >>>> Sent from my iPhone

>> >>>>

>> >>>> On Apr 11, 2017, at 5:39 PM, Michael Hanz <aaf-radio-
>> >>>> 1 at aafradio.org
>> >>>> <mailto:aaf-radio-1 at aafradio.org>> wrote:

>> >>>>> See http://aafradio.org/garajmahal/flex_drive_cables.html for
>> >>>>> all
>> >>>>> that stuff.  The tuning shaft collar is a straight 1/2"-27TPI
>> >>>>> thread
>> >>>>> (_not_ a tapered pipe thread).

>> >>>>>

>> >>>>> 73,

>> >>>>> Mike

>> >>>>>

>> >>>>>

>> >>>>> On 4/11/2017 5:26 PM, Phillip Carpenter wrote:

>> >>>>>> Does anyone know what thread size and type of through-hole nut
>> >>>>>> fits the shaft collar on the Command Set receivers?
>> >>>>>>

>> >>>>>> I know it's smaller than a 3/8" NPT compression nut.

>> >>>>>>

>> >>>>>> Thank you in advance to all who reply!

>> >>>>>>

>> >>>>>> Respectfully,

>> >>>>>>

>> >>>>>> Phillip W4RTX

>> >>>>>>

>> >>>>>> Sent from my iPhone

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>> >> bark less - wag more

>> 

>> >>

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