Re: {Collins} FW: refreshing the white indices on knobs



Easy to tell if it is Bakelite. Take a soldering iron and apply the tip to the knob (back side of course), plastic will melt, Bakelite will not.


Bill - K5MIL




________________________________
From: donroden@xxxxxxxxxx <donroden@xxxxxxxxxx>
Sent: Friday, October 20, 2017 2:00 PM
To: collins@xxxxxxxxxxxxx
Subject: Re: {Collins} FW: refreshing the white indices on knobs

On my mid to late 60s S Lines, the knobs look like Bakelite... never
noticed any paint wearing off.

Don W4DNR




Quoting Dukes HiFi via Collins <collins@xxxxxxxxxxxxx>:

> I have seen the same thing on S  Line knobs, but NEVER on their
> predecessors. I always wondered why Collins painted these when the
> Bakelite was a perfectly wonderful look that lasted forever!
>
> At least with Bakelite, you can use pretty aggressive paint remover
> and not destroy the underlying Bakelite, a phenol/formaldehyde
> plastic filled with inert filler.
>
> Bakelite also takes on a beautiful shine with not too much work.
>
> Gary
>
>
>> On Oct 20, 2017, at 7:30 AM, Bill Carns via Collins
>> <collins@xxxxxxxxxxxxx> wrote:
>>
>> Well,  I think I fall on my sword and apologize to Kurt.  I am not a "Later"
>> S-Line guy.  I love that winged stuff and have just a few round and one
>> Rockwell piece.  I am old, so my Collins has to be old - right!
>>
>> And, I have not worked on a lot of the newer later Collins S-Line.
>>
>> I have used Lacquer stick on some later Rockwell aircraft stuff, but never
>> had a problem.
>>
>> Sooooooooo...   Oooops.  . . . .  and I withdraw my comment.
>>
>> Thanks for the education Charlie.
>>
>> Bill
>>
>> -----Original Message-----
>> From: Collins
>> [mailto:collins-bounces+wcarns=austin.rr.com@xxxxxxxxxxxxx
>> <mailto:collins-bounces+wcarns=austin.rr.com@xxxxxxxxxxxxx>] On
>> Behalf Of Charlie T via Collins
>> Sent: Friday, October 20, 2017 7:03 AM
>> To: collins@xxxxxxxxxxxxx <mailto:collins@xxxxxxxxxxxxx>
>> Subject: {Collins} FW: refreshing the white indices on knobs
>>
>>
>>
>>
>>
>> "Collins knobs were never painted and there is no problem that I know of.  I
>> have been using Lacquer stick in my hobby for some 35 years and never seen a
>> problem.  I also used it on aircraft knobs before that.  If someone has
>> "beautified" their Collins by painting (Groan!) their knobs, then it would
>> depend on what paint they use..  But, when I see painted knobs, I just
>> remove the paint and buff out the knob."
>>
>> Bill
>>
>> Hey Bill, I thought ALL later S-Line knobs WERE in fact painted.
>> That's why they get so grungy looking when finger oils attack it and it
>> starts to peel off.
>> It eventually gets bad enough that you can scrape most of the paint off with
>> your fingernail.
>> I have removed the paint for a number of them and then polished the bare
>> black Bakelite for a like new (but not satin) finish.
>>
>> I've always heard the reason was that the military did NOT want the shiny
>> knobs and insisted on a "satin" finish, which is only possible if the knob
>> itself IS painted.
>>
>> 73, Charlie k3ICH
>>
>>
>>
>>
>>
>>
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