[ARC5] Cost of sets - 1950 and 2010

[Brooke Clarke]

Hi:

The PRC-112 survival radio, see:
http://www.prc68.com/I/PRC112.shtml#Ver
uses 2.2-0.45x9 mm screws with Bristol heads that are impossible to find 
with any head.
If you know of a source (other than a making them) let me know.

Have Fun,

Brooke Clarke
http://www.PRC68.com


Leslie Smith wrote:
> Gentlemen,
> It's not DIFFICULT to tell the difference between 2.5mm and 2.6mm pitch threads, it's impossible.  There is NO 2.6 mm thread.  There IS a 2.2mm thread, but how many here can say they have seen one?
>
> But given that the difference between 2.5 and 2.2mm threads (which DO exists), given that the difference is 0.3mm (12 thou or mils, to use the US term) it would be wise to use a vernier gauge to make the measurement.
>
> BTW we have an older lathe in the workshop.  DOM or Date of supply to the GARDEN ISLAND SHOPYARD was 1953.  The dial gauges on the table are  calibrated in inches, 125 mils increase in cut to a major rotation of the tool.  Minor calibration mark is 1 thou.   Because I draw in metric, but use this v old lathe I must convert between the two units.  When I wish to discuss work with a Spanish machine operator I revert to mils (or thou) at times.  When I do this Jose looks at me, with a sad look in his eyes and says:  "Les, why you talk this Imperial rubbish.  The imperial system, she's a-fucked."  Then Jose brings out his vernier and shows me how .01 mm is equal to 1/2 thou (0.394 thou to be precise), and I can work in whole numbers if I abandon my ignorance.  Jose is not only right, he has a good deal more experience than I do.
>
> Jose's description of the Imperial system invariably causes a great deal of mirth around the workshop, and I walk away embarassed.
>
>
> Les
>
>
>    
>> ----- Original Message -----
>> From: WA5CAB at cs.com
>> To: arc5 at mailman.qth.net
>> Subject: Re: [ARC5] Cost of sets - 1950 and 2010
>> Date: Fri, 24 Sep 2010 12:37:59 EDT
>>
>>
>> Those I can sort by just looking at them.  But it's hard to tell the
>> difference, for example, between 2.5mm and 2.6mm.
>>
>> In a message dated 9/24/2010 10:37:29 AM Central Daylight Time,
>> jmfranke at cox.net writes:
>>      
>>> Yes, but we have the same problem:
>>> 6-32 6-40
>>> 1/4-20 1/4-28
>>> 8-32 8-40
>>> etc.
>>>
>>> John  WA4WDL
>>>
>>> --------------------------------------------------
>>> From:<WA5CAB at cs.com>
>>> Sent: Friday, September 24, 2010 11:00 AM
>>> To:<arc5 at mailman.qth.net>
>>> Subject: Re: [ARC5] Cost of sets - 1950 and 2010
>>>
>>>        
>>>> Yes.  There are several different systems of diameter versus pitch.  For
>>>> example, at least two different ones used for mounting hard
>>>>          
>>> drives and CD>or
>>>        
>>>> DVD drives.
>>>>
>>>> In a message dated 9/24/2010 6:54:30 AM Central Daylight Time,
>>>> vk2bcu at operamail.com writes:
>>>>          
>>>>>> "As far as I can tell, there are STILL no universally standardized
>>>>>>              
>>>>> metric threads and diameters."
>>>>>
>>>>> You aren't serious?
>>>>>            
>> Robert&  Susan Downs - Houston
>> wa5cab dot com (Web Store)
>> MVPA 9480
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>>      
>    
>>      
>
>    

-- 
Have Fun,

Brooke Clarke
http://www.PRC68.com