[R-390] Fwd: Antenna trimmer drawings

[Nick England]

 .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
>
>
>
>>