Different Cherry MX stem size

[Ctn]

Need measurements from people with accurate calipers.

[Ctn]

It's too large a difference. 1.0mm vs 1.07mm and 1.1mm.

Further more. 1.07mm and 1.1mm were taken with the same Digital Caliper, so there's 0.03mm difference between the keys on 1 keyboard (Red) and the keys on another keyboard (Brown).
Like you said "Damn those German Cherry Corp engineers are good.". All the Red switches were consistently 1.07mm and all the Brown switches were consistently 1.1mm

Do you have a Cherry Corp datasheet stating the width of the vertical stem?

My red switch does not look like the red switch in your picture.

My red switch looks like this minus the diode.


One thing I've noticed is the Vertical Stem part is not a sharp 90deg angle like in the datasheet but a tapered edge.

My Red switch is similar to


as opposed to



Lets wait for more people to respond with measurements.

[daerid]

If I had a micrometer, I'd definitely measure.

All I know is that the same keycap when fitted to multiple stems on my blue, black, and brown boards fits snugly. However, the very same keycap when fitted to either the Filco Linear R, or Poker w/ Reds fits very loosely.

That's all the science I need to know that, at least in my particular batch of reds, the stems are slightly smaller than the rest.

[Ctn]

If I had a micrometer, I'd definitely measure.

All I know is that the same keycap when fitted to multiple stems on my blue, black, and brown boards fits snugly. However, the very same keycap when fitted to either the Filco Linear R, or Poker w/ Reds fits very loosely.

That's all the science I need to know that, at least in my particular batch of reds, the stems are slightly smaller than the rest.

Same.

[Ctn]

Maybe.  Not Signature Plastics.

I recently added this to the Cherry MX Stem after arguing in the "My Red Cherries have smaller stems" thread.   I like Socratic debate as a way of furthering Keyboard Science.  Some people at Geekhack hate that style.

Show Image

http://geekhack.org/showthread.php?20745-Up-side-down-cherry-switch&p=400526&viewfull=1#post400526

The diagram shows 0.159" for the vertical and horizontal stem height which is 4.0386 (4U and 6U mount)
Ripster measured 4.0mm. I measured 4.03mm (Brown) vs 4.02mm (Red) which fits with the diagram's measurements.

That diagram shows 0.047" for the vertical stem width which is ~1.1938 mm (4U, 6U, 0L mount). Ripster measured 1.0mm.
That diagram shows 0.044" for the vertical stem width which is ~1.1176 mm (0M mount). Ripster measured 1.0mm.

My measurements were Brown at 1.1mm and Red at 1.07mm. These are closer to the 0M mount than the 4U, 6U, 0L mount.

Sigh still not solved.

[Ctn]

Well of course the keys will have slightly bigger dimensions to take into account texture of the plastic and some play.

0.1938mm bigger by your measurements to "take into account texture of the plastic and some play" ? . Seems a bit loose.

What we need is a similar diagram for the Cherry MX stems.

[Ctn]

Have you tried the SAME key on both color stems.    First eliminate Keys as the variable.  

Keyboard Science 101.

First thing I did. HAVE you?

Filco Brown keycaps fit normal on Cherry Brown stems.
Filco Red keycaps fit normal on Cherry Red stems.

Filco Brown keycaps fit loosely on Cherry Red stems.
Filco Red keycaps fit snugly on Cherry Brown stems.

This is when I took measurements with a digital caliper, and it confirmed my suspicions that the Red Stem is slightly smaller than the Brown stem wrt the vertical stem width.

Similar findings as daerid, see http://geekhack.org/showthread.php?20569-Different-Cherry-MX-stem-size&p=396249&viewfull=1#post396249

[Ctn]

I would check that key thing but I'm kinda busy with that whole ping thing.  These KBCs sure fit fine on my Red Cherry though.

Have you tried the SAME key on both color stems. First eliminate the variables.

Keyboard Science 101.

[Ctn]

I thought you being #1 Keyboard Expert, you'd know.

Is the ping thing really that bad?

Both my Filco's ping a little but it doesn't bother me.

I can only hear it if I have my ears right next to the keyboard and bash the key quickly.

Who types like that anyway.

[keyboardlover]

This is what is known as "swinging poll results in your favor." Ripster learns from the best, like his hero Obama.

[The Solutor]

Have you tried the SAME key on both color stems.    First eliminate Keys as the variable.  

Keyboard Science 101.

A scientist should learn the difference between a constant and a variable.

If the same keycap fits differently on different stems the keycap is the constant not the variable.

[FourOhFour]

A scientist should learn the difference between a constant and a variable.

If the same keycap fits differently on different stems the keycap is the constant not the variable.

Which is how you remove it as a variable, by testing the same cap. Until someone tests it with the same cap (assuming that hasn't already happened), you have two variables and you're gonna get nowhere except a good 'ol Internet Argument.

[The Solutor]

Which is how you remove it as a variable, by testing the same cap. Until someone tests it with the same cap (assuming that hasn't already happened), you have two variables and you're gonna get nowhere except a good 'ol Internet Argument.

I wrote "If the same keycap..." so there's no need to add anything else.

It's pretty obvious (even for Ripster I hope) that fitting tewo different keycaps on two different switches, lead to nowhere...

[The Solutor]

Using The Solutor as a Tool I have determined Italian Keyboard Science is vastly different than American Keyboard Science.

You forgot to add "luckily" :party: