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[GB] F104+SSK+122+62+77+50+Ergo orders now open! Kishsaver+Industrial Model F

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--- Quote from: Ellipse on Sat, 15 June 2024, 13:22:16 ---Layouts update:

We were talking about possible new layouts for the Model F:  Model F Preonic and Planck style keyboards have gotten 25 poll submissions over on reddit over the past few days from someone who was interested in them.  I may do a more official interest check with collecting emails in the near future.

--- End quote ---

Glad I saw this! Id be very interested in a Preonic-layout (5x12) compact Model F.

For Model F Preonic and Planck style keyboards (5x12, 4x12, or 6x12 ortholinear) what kind of case styles do people like?  Please share photos and links. 

For small production run cases without a mold we would probably be limited to the style of cases found on the F15 split ergonomic keyboard for example - 3 pieces assembled together, unless folks can point to other nice small run project cases.  CNCing the cases from a solid aluminum block would be too expensive.

We may be able to eliminate part of the bezel thanks to wcass's success with 4 layer Model F capacitive PCBs to remove the need for large traces.  To keep the original 0.8mm thickness each PCB layer may have to be too thin though for effective capacitance sensing; I am not sure if this was tested.

XT model F keypresses to me feel less crisp, more spongy and heavier than Ellipse boards. They have practically the same parts so I imagine the difference has something to do with wear or spring properties. Is the source of the differences well understood?

I think it is a matter of the tolerance between the keycap placement within the barrel and the spring free length.  For example, if the spring free length increased and nothing else changed, the key press force might increase a little.  The XT barrel and some AT barrels may leave a key slightly lower down in the barrel for the resting position, meaning the spring is slightly more compressed (near the bottom of the barrel, the keycap snaps into place at a certain point which determines the resting place of the key when a flipper and spring are installed in the barrel).

The tradeoff is that the Model F keyboards with that tolerance combination are slightly louder and crispier in their snappiness, but they require slightly more key press force.  In general the original Model F keyboards range from the XT side (heavier presses and snappiest) to the F122 / AT / other F's (about in the middle or slightly lighter in my experience).  Less crisp XT examples may have more spring oxidation/rust.

I have seen this doing press force experiments with the brand new beam spring project - a slightly higher free length of the spring results in increased press force grams required.  I also did make some Model F springs with slightly longer free lengths that seem to confirm this theory.

Very interesting information, thanks!


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