[R-390] Fwd: Antenna trimmer drawings

Fri Sep 13 15:06:49 EDT 2024

Just to be clear...

Along with the rounded centering tip or "nub" on a roll or spring pin punch 
there is also a depressed groove around the circumference of the end wall 
designed to pinch the split together and very slightly reduce the diameter 
of the pin itself.

While the punch I used had both of these features, it was made in "asia" and 
of rather dubious quality...

My description might not be clear, but that's what living with Asperger's 
will do...!!

73...Jordan VE6ZT

----- Original Message ----- 
From: "Barry" <n4buq at knology.net>
To: "Nick England" <navy.radio at gmail.com>
Cc: "R-390 Mailing List" <r-390 at mailman.qth.net>
Sent: Thursday, September 12, 2024 8:03 AM
Subject: Re: [R-390] Fwd: Antenna trimmer drawings

> Thanks for that, Nick.  I don't think we ever had any formal roll-pin 
> punches in the machine shop where I worked.  We made do with ordinary pin 
> punches and likely never knew such fancy punches existed.  :)
>
> I think you're correct on it being a roll-pin.  I should never even try to 
> trust my memory from that long ago!
>
> Thanks,
> Barry - N4BUQ
>
>> .062/.065 is probably a tolerance as the parts list is for a mil-spec
>> MS171434 cylindrical 3/8 x 1/16 slotted pin
>> https://www.huyett.com/ms171434
>> You should be able to drive it out with Kroil and a 1/16 roll pin punch.
>>
>> It is a good day -- I learned something new - roll pin punches vs. pin
>> punches
>> found in a machinist forum on line -
>> "Roll pin punches are just like pin punches, but have a small projection 
>> on
>> the center of the end to keep them from sliding off the end of the pin 
>> and
>> are a couple of thousandths smaller than the nominal pin size so they 
>> will
>> not bind in the hole."
>> https://www.mcmaster.com/roll-pin-punches/
>> https://www.mcmaster.com/mvD/Library/M3/20230328/DDA71A01/3421A33_Pin-Removal%20Punch%20for%20Hollow%20and%20Spring%20Pins.PDF
>>
>> My motto - "It is a damn poor job that doesn't require at least one new
>> tool."
>>
>> -------------------
>> Slotted Spring Pin 1/16" x 3/8" Standard Duty 410/420 Stainless Steel
>> Passivated MS171434
>>
>> • 410/420 are both martensitic stainless steel with moderate chromium
>> contents of 11.5 to 13.5% and 12 to 14%, and carbon levels of .08 to .15%
>> and .30 to .40%
>> • A passivated part is one that has been chemically treated to help 
>> reduce
>> its ability to react to exposure and corrode
>> • Stainless steel contains more than 11% chromium, resists corrosion,
>> maintains its strength at high temperatures, and is easily maintained
>> • Stainless steel is strong, durable, and corrosion resistant
>> • Slotted spring pins are hollow, cylindrical tube-style press fit
>> fasteners with chamfered ends that are lighter, cheaper, and easier to
>> install than solid pins
>> • Commonly used as locking devises, positioning points, anti-chafing
>> surfaces, shafts, or sleeves for wiring
>> ----------------------------------
>>
>> Nick England K4NYW
>> www.navy-radio.com
>>
>>
>> On Thu, Sep 12, 2024 at 8:04 AM Jordan Arndt <Outposter30 at shaw.ca> wrote:
>>
>>> Thanks Nick for that information...I'll be reviewing it as time allows.
>>>
>>> One question of the bat however...The roll pin diameter dimension is 
>>> shown
>>> as .062/.065. Is this a tolerance allowance or does it indicate that the
>>> pin itself is tapered...?
>>>
>>> Tapering of the pin may explain at least some of the difficulties I've 
>>> had
>>> removing the pin..
>>>
>>> Thanks again an VY 73...Jordan VE6ZT
>>>
>>> ----- Original Message -----
>>> *From:* Nick England <navy.radio at gmail.com>
>>> *To:* Jordan Arndt <Outposter30 at shaw.ca> ; Collins R-390 HF Receiver 
>>> List
>>> <r-390 at mailman.qth.net>
>>> *Sent:* Thursday, September 12, 2024 5:49 AM
>>> *Subject:* Antenna trimmer drawings
>>>
>>> Oh, I created an actual searchable index to the drawings here
>>> https://www.navy-radio.com/rcvrs/r390a/drawings.htm
>>>
>>> A quick search for “trimmer” shows this assembly drawing
>>>
>>> https://www.navy-radio.com/rcvrs/r390a/drawings/17310-05/05-95-SM-C-248962-TRIMMER%20ASSY%20-%20R.F..pdf
>>>
>>> It references this capacitor drawing
>>>
>>> https://www.navy-radio.com/rcvrs/r390a/drawings/17310-04/04-80-SM-B-283234-CAPACITOR,%20VARIABLE.pdf
>>>
>>> There are also 3 other detail drawings showing shaft, bracket, and 
>>> shield
>>>
>>> Nick England K4NYW
>>> www.navy-radio.com
>>>
>>> On Thu, Sep 12, 2024 at 6:29 AM Jordan Arndt <Outposter30 at shaw.ca> 
>>> wrote:
>>>
>>>> I am currently dealing with serious family issues leaving little time 
>>>> for
>>>> anything else, but I was wondering of anyone has found, or knows if 
>>>> those
>>>> drawing files contain any info regarding the Ant Trim assembly..?
>>>>
>>>> Given that the assembly appears to have been provided as a complete 
>>>> unit
>>>> to
>>>> production, there might not be drawings regarding the assembly, but I
>>>> currently do not have time to investigate the now available drawings.
>>>>
>>>> Since I have been unable to fully disassemble the Ant Trim assembly
>>>> because
>>>> I've been unable to remove the roll pin, I need to know what is inside
>>>> the
>>>> assembly for spacers and if there might be a phenolic centering bushing
>>>> on
>>>> the inside of the assembly...
>>>>
>>>> Any info would be greatly appreciated...
>>>>
>>>> 73...Jordan VE6ZT
>>>>
>>>> ----- Original Message -----
>>>> From: "Glenn Little WB4UIV" <glennmaillist at bellsouth.net>
>>>> To: "jkharvie" <jkharvie at verizon.net>; <r-390 at mailman.qth.net>
>>>> Sent: Wednesday, September 11, 2024 8:19 PM
>>>> Subject: Re: [R-390] Meter Gaskets?
>>>>
>>>>
>>>> > Tom M located the drawing package and they are hosted by Nick 
>>>> > England.
>>>> > The package appears very complete.
>>>> > You could come close to building a R390A from the package.
>>>> >
>>>> > I just forwarded the information.
>>>> >
>>>> >
>>>> > The pdf version of all 1000 drawings are now posted here -
>>>> > https://www.navy-radio.com/rcvrs/r390a/drawings/
>>>> > The categories are ones Tom used as labels
>>>> >
>>>> > Glenn
>>>
>>>
>>>
>>>>
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