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geekhack Community => Keyboards => Topic started by: bhtooefr on Wed, 17 December 2008, 17:34:26

Title: Key force specifications for the Model M?
Post by: bhtooefr on Wed, 17 December 2008, 17:34:26

I'd actually prefer older specs from the IBM-era boards, but newer specs will work as well.

I do know that the M15's spec is 65g +/- 10g.

Title: Key force specifications for the Model M?
Post by: Chloe on Wed, 17 December 2008, 23:11:41

It would be nice to find a force graph or datasheet for the buckling spring.
This site (http://mykeyboard.co.uk/keyswitches/) found the activation force of a 92G7454 to be 80 cN.

Title: Key force specifications for the Model M?
Post by: Chloe on Wed, 17 December 2008, 23:54:23

The US patent (http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=4118611) has a force graph:

(http://geekhack.org/attachment.php?attachmentid=384&stc=1&d=1229580001)

Title: Key force specifications for the Model M?
Post by: bhtooefr on Thu, 18 December 2008, 00:41:43

Well, that's 70 grams, although that's not necessarily correct for an M.