[HBR] Ordering aluminum

[George N2APB]

Thanks for the tips guys.  The side braces is one that I had overlooked, but
it¹s easy to do with big benefit.

I¹ve poured through the photo archives on the K5BCQ site yet didn¹t see any
examples of using aluminum channel for the chassis sides with a plate for
the chassis top.  I like the approach of using channel, as intuitively it
will provide a super-strong/inflexible chassis.

But what I¹m puzzled about is whether/how to use channel for all sides of
the chassis.  Use on the sides is obvious, but using channel also for the
front (and rear) presents problems with the controls needing to go through
this additional thickness (perhaps 3/16² channel + 1/8² front panel).  Am I
missing something?  Perhaps use large hole cutouts in the channel to allow
the controls to connect only to the front panel?

And if indeed used on all sides, one would need to miter the corners to
allow the lips of the channel to meet at 45-deg angles.  Do-able, but again
I haven¹t seen any detail like this.

Thanks for any tips on this.  I¹m using a mint cabinet (Collins 75A-4) and I
have lots of space to work with, so I¹m looking to build a
battleship-strength mechanical assembly for this HBR-16 ­ hence the use of
AL channel.

73, George N2APB


From: Peter Bertini <radioconnection at gmail.com>
Reply-To: HBR Receiver List <hbr at mailman.qth.net>
Date: Thu, 29 Jul 2010 13:40:16 -0400
To: HBR Receiver List <hbr at mailman.qth.net>
Subject: Re: [HBR] Ordering aluminum

Coming up with a pair of side panel braces between the front panel and side
ends of the chassis (as used on many early receivers, such as the SX-42 and
SX-28) would also help to minimize chassis flex and movement. Pete



On Thu, Jul 29, 2010 at 1:24 PM, C Eus <catman351 at gmail.com> wrote:

> Make sure you have solid bracing betweent the chassis and the front panel.
> Oh, one more thing: when you finally put the rx together with the cabinet,
> be sure you anchor the chassis to the cabinet.  I found a few examples in
> which the chassis was literally flexing inside the cabinet.  The front
> panel
> did not provide enough stiffness to stop this from happening.  Even if the
> front panel were "flex resistant," anchor the chassis to the cabinet
> anyway.
>
> FWIW,
> Cal, N6KYR/4
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