Re: foam pads. was: Successful keyboard jack repair

Hey all,

Sounds good. Today I checked the new pads and they work fine. the feel is different from having no pads whatsoever (foam is gone, remember) I tested several foils for the capacitor part, and all worked well:

-chips bag foil (lays)
-alu tape with clear tape on top of that
-the original pads

Original pads are quite difficult to work with, as there is still some foam on the back and centering the hole punch over them takes more time than just punching away on a laminated sheet of materials. The hard plasic surface of the mousepad is a little thick, so fixing them on the keycaps takes some practising and pushing with a small flat screwdriver to get them behind the hooks. But the result is quite good.

next week I will try to visit a foamshop nearby and ask them is they can make a sheet of 3.8mm. :-)

On 07-03-15 15:53, snhirsch wrote:
>
>
> On Saturday, March 7, 2015 at 3:08:51 AM UTC-5, Simon Claessen wrote:
>
>
> I suspect that the thickness of the foam is not right and the foil is
> not touching the pcb. I've measured a still functional pad and it is
> 3.8mm heigh, 11mm wide. at the moment I am developing a production
> methode to fix our more that 10 keytronic keyboards (lisa, vt100, gigi,
> etc.) and yesterday I combined a Ikea mousepad, doublesided foam tape
> and the bag from potato-chips. I still have to check if the foil is
> right for the job, but the height is critical.
>
>
> Here's some information on the subject I posted to cctalk a month back.
> The foam I describe comes closer to the original feel than anything else
> I've used. In all other respects, I followed Al Kossow's advice, using
> aluminized "Party Foil' from Michaels Crafts, commercial plastic
> sheeting and a cheap disc-cutter punch from eBay. Still a royal PITA,
> but great results.
>
> I've fixed a couple of keyboards using hobby shop track bed foam, but
> have not been very happy with the "feel". That
> foam is considerably less resilient than the material Keytronics used.
> After trying a number of alternate materials, I
> have found something that is almost identical to the original. Take a
> look at eBay #171549720453 for an example.
>
> It's 5mm thick with an adhesive backing, sold for shoe inserts. I stuck
> 0.075" plastic sheet to the backing, then
> turned it over and used spray adhesive for the aluminized mylar. Worked
> like a charm. Just finished resurrecting a N*
> Advantage and the typing feel is (in my opinion) far better than the
> last unit I did with track-bed foam (Corvus
> Concept).
>
> --
> --
> -----
> You received this message because you are a member of the LisaList group.
> The group FAQ is at http://lowendmac.com/lists/lisa.html
> To post to this group, send email to lisalist_at_email.domain.hidden
> To leave this group, send email to lisalist+unsubscribe_at_email.domain.hidden
> For more options, visit this group at
> http://groups.google.com/group/lisalist
> ---
> You received this message because you are subscribed to the Google
> Groups "LisaList" group.
> To unsubscribe from this group and stop receiving emails from it, send
> an email to lisalist+unsubscribe_at_email.domain.hidden
> <mailto:lisalist+unsubscribe_at_email.domain.hidden>.
> For more options, visit https://groups.google.com/d/optout.

-- 
Met vriendelijke Groet,

Simon Claessen
drukknop.nl

-- 
-- 
-----
You received this message because you are a member of the LisaList group.
The group FAQ is at http://lowendmac.com/lists/lisa.html
To post to this group, send email to lisalist_at_email.domain.hidden
To leave this group, send email to lisalist+unsubscribe_at_email.domain.hidden
For more options, visit this group at http://groups.google.com/group/lisalist
--- 
You received this message because you are subscribed to the Google Groups "LisaList" group.
To unsubscribe from this group and stop receiving emails from it, send an email to lisalist+unsubscribe_at_googlegroups.com.
For more options, visit https://groups.google.com/d/optout.