<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On Jun 16, 2014, at 9:05 PM, Walter Bender wrote:</div><blockquote type="cite"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Mon, Jun 16, 2014 at 9:03 PM, John Watlington <span dir="ltr"><<a href="mailto:wad@laptop.org" target="_blank">wad@laptop.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0.8ex; border-left-width: 1px; border-left-color: rgb(204, 204, 204); border-left-style: solid; padding-left: 1ex; position: static; z-index: auto; "><div style="word-wrap:break-word"><div><br></div><div><div>Walter,</div></div><div> You remember correctly. The hard/clicky/crunchy keyboards are not rated</div>
<div>for as long a lifetime as the membrane/chewy keyboards. While the membrane</div><div>keyboard design was tested to 5 million key presses, IIRC the clicky keyboard is</div><div>only rated to 1 million key presses. (On the other hand, it takes one minute</div>
<div>to replace a clicky keyboard versus twenty for a membrane keyboard.)</div></div></blockquote><div><br></div><div>..if you have a replacement keyboard... any insight into how easy it would be to make replacement keys in the field?</div></div></div></div></blockquote><div><br></div><div>I would say impossible, but that would be underestimating the creativeness of</div><div>our deployments.</div><div><br></div><div>At the electrical level, the crunchy and chewy keyboards have the same contacts,</div><div>so I don't expect that to be the failure mechanism. Failure should be due to the</div><div>mechanical parts (as it is with the membrane keyboards). If you pull off the keycap</div><div>and the guide mechanism, the key still activates when you press on the membrane</div><div>or the rubber cap (which provides both the spring action and presses on the contacts)</div><div>glued to it.</div><div><br></div><div>Cheers,</div><div>wad</div><br><blockquote type="cite"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0.8ex; border-left-width: 1px; border-left-color: rgb(204, 204, 204); border-left-style: solid; padding-left: 1ex; position: static; z-index: auto; "><div style="word-wrap:break-word"><div><div><div>WARNING: The clicky keyboard was not approved for use by small children</div>
<div>by UL. The reason is that if the keys are pulled off they present a choking</div><div>hazard.</div><div><br></div></div></div><div>Cheers,</div><div>wad</div><div><br></div></div></blockquote></div></div></div></blockquote></div><br></body></html>