search

ebastler / marbastlib

A library collecting MX and Choc style footprints, as well as various other parts used to design custom keyboards
CERN Open Hardware Licence Version 2 - Permissive
369 stars 43 forks source link

Too small PCB holes for Choc v1 #21

Open bolleywall opened 12 months ago

bolleywall commented 12 months ago

In marbastlib Choc v1 footprints, the diameter of the holes for the smaller mounting pins is 1.7 mm., while Kailh recommends 1.9 mm.

ebastler commented 12 months ago

Hi! Thank you for pointing this out.

If I remember correctly we originally opted for this to allow plateless hotswap to work decently without wobbling, and then mistakingly used the footprint for both HS and solder.

It is tested and works (although the switches will afterwards probably sit loosely in 1.9mm hole PCBs if you remove them from ours). I am considering to keep it for hotswap, but switch to the recommended hole sizes for solder footprints as those do not need the mechanical stability of tight legs.

On the other hand I feel reluctant to change something tested and working. I will order a testing PCB with my next PCB order (with footprints with 1.7mm, 1.8mm and 1.9mm) and decide after comparing them side-by-side.

bolleywall commented 12 months ago

Thank you for explaining your reasoning! Now I too need to order a test PCB and compare various hole sizes for both the side posts and the middle one :-)

Apparently some feel 1.9 mm is too large (link for reference: https://old.reddit.com/r/ErgoMechKeyboards/comments/mdvy5w/what_size_through_holes_do_you_use_for_kailh_choc)