On 11/17/2015 2:03 PM, rod wrote: > 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 > arm. > 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. >
If the contacts are bad, then, after removal, perhaps you could unfold the tabs that hold the fiber/phenolic piece with the contacts in it and then swap that contact piece and maybe the switch post piece, and bend the tabs back, keeping the original mechanical parts? JRJ > 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. > > Rod > > > > > 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: >> >> http://www.digikey.com/product-detail/en/GF-1126-1110/SW105-ND/948 >> >> (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). >> >> JRU >> >> > >
