Todays Topic from Panelman

rod rodsmallwood52 at
Tue Nov 17 14:03:47 CST 2015

Thanks yes they do look similar. I'll download the data sheet.
What I forgot to explain was the problem is not the switch itself but 
the additional part on top into which the two pivot pins locate.
My policy is to produce form factor replacements. In this case the lever 
If they can then be incorporated into other assemblies then good.

Here the lever rotates about a pivot point formed by the two sides of 
the additional structure on top.
A missing segment in the lower semi-circular part of the lever engages 
with the slide switch and moves it.
So there being no known source of the switch with the extra part on top 
and not wanting to change the lever.
What do we do? It would not have been feasible to make the top part and 
attach it, as its spring steel.
Its horrible stuff to work with. Pretty much you are limited to die 
stamping it in a heavy press.

They would have punched the shape and the holes out with a hardened die
and then before or after spot welding it to an empty switch body hit it 
again with a folding die to bring the sides up.
That would be too expensive to get set up. So I am looking at alternatives.


On 17/11/15 18:38, Jay Jaeger wrote:
> On 11/17/2015 2:34 AM, rod wrote:
>> Now to the slide switches themselves.
>> They are mounted by the screw hole lugs having been slid into  a groove
>> in two aluminum bars which in turn are attached to the PCB by pillars
>> and screws.
>> There are six connection pins on the bottom of each switch that go into
>> holes in the PCB. (not all used) Switch replacement would be easy and a
>> complete switch and lever sub module not too difficult. I hear a voice
>> from the distant past saying 'Micro switches'
>> Thats all for to-day
>> Rod
> The ones I have seen (on my PDP-8/L and PDP-12) are simple stock
> old-school slide switches (definitely not Micro-Switch switches), that
> typically look like this one:
> (I did *not* check dimensions to see if this particular one is right or
> not - there were standard size and miniature versions.  But the photo
> looks about right).

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