new big skcm blue alps


25 May 2020, 05:04

Sweet!!!!! 👍👍👍

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25 May 2020, 06:00

This project looks like a lot of fun to work on. Keep it going!

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01 Jun 2020, 22:45


So my spring came and it seems to work with the top housing on the desk. Slight problem is that the lower housing part nub is a bit too big. So I will need to make a new one with a smaller nub. Regardless It's coming along!

Comparison of the template for the leaf spring/switch plate metal part. I will get the square punch to make the inside cutout nicer.
template new old.jpg
template new old.jpg (4.83 MiB) Viewed 433 times
Fit of the old leafspring piece on the switch plate. Bit too big.
old too big.jpg
old too big.jpg (2.51 MiB) Viewed 433 times
Better fit of the new one.
new better.jpg
new better.jpg (3.61 MiB) Viewed 433 times

All the switch pieces with the 1st and 2nd gen style click leafs.
pieces.jpg (2.46 MiB) Viewed 433 times
Top of the switch with the spring inside
spring inside.jpg
spring inside.jpg (2.43 MiB) Viewed 433 times

and the sad doh moment of seeing that I forgot to make a bottom part with a smaller nub to sized for the new spring
nub too big.jpg
nub too big.jpg (2.44 MiB) Viewed 433 times

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02 Jun 2020, 01:16

Would you consider it's easier to work with a bigger switch than a real-sized one? Loooks good for prototyping.

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02 Jun 2020, 02:21

PlacaFromHell wrote:
02 Jun 2020, 01:16
Would you consider it's easier to work with a bigger switch than a real-sized one? Loooks good for prototyping.
Hi it's definitely easier to make a bigger switch than a smaller one. Much easier to hand cut metal etc. Its good for prototyping but there is one consideration.

There is a minor thing to keep in mind. The variances are scaled up with the switch. I can adjust the sizes of various parts by quite a bit of ranges.

I have huge leeway with things like the return spring. But I've found for the alps click leaf that even the slightest of changes bend wise make the click disappear.

So if you are making a big click leaf. It's great. But if you are scaling down your big click leaf design suddenly your slight error makes it not click. It can be harder to adjust those smaller pieces.

The main thing is that scaling the switch down might not necessarily be as easy as reducing every measurement by 4x.

Some materials like thin metals might not scale correctly requiring changes. For instance in my alps switch the switch plate metals are 1.3mm thick. Which is 4x scaled up.

Imagine if the skcm blue alps never existed and I was prototyping a new click switch in this thread. I might not think 1.3mm metal was required. That 1.3mm metal is me scaling up the switch plate .3mm to .4mm metal of the small one to the big size. If I was independently making a new switch I might use .6mm thick metal. Why not? For my big switch that is sufficient. Scaling that .6mm down though would make it be too thin for a small scale switch.

For very complicated switches this could be a slight issue.

It's not the biggest problem though, just a consideration to keep in mind.

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02 Jun 2020, 02:33

Here is what I mean. Again, this is not a major issue at all but if your switch is complicated it could add some minor headaches later if you design the big one first.

This skcm blue has its contact switch plate thickness here. And this novel keys big switch has a comparable thickness contact.

If you independently designed the big switch then scaled it down the metal contact would be too thin.

Also some metals might stop bending/deforming in the correct way at different scales. They might just crease and fold if directly scaled down. Or not bend or snap if scaled up.

Just something I noticed.
IMG_20200601_202929.jpg (3.43 MiB) Viewed 379 times
IMG_20200601_202947.jpg (3.16 MiB) Viewed 379 times

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02 Jun 2020, 03:44

Nice. Thanks dude, anyways my switch lacks of a mechanical simulated click, I just want to be able to guess a force curve. I may use some wood.

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05 Jun 2020, 05:33


Hopefully have the printed new bottom part with the correct nub for spring soon.

For now I've started to model the switch in fusion360. Here are the STL files for the stem and top housing so far.

I was using a random stem model I found before, but now I have made my own. Which is great.

The upper housing is missing the chamfering, but otherwise they are much more accurate than the previous ones. Must figure out how to share parametric models.

kralcifer has been a great help with parametric modelling and fusion360. It has been great learning how to make parametric models. The ones I have are pretty inefficient, but the abilities the system unlocks are great.
lets go.jpg
lets go.jpg (75.6 KiB) Viewed 294 times
bottom yes.jpg
bottom yes.jpg (79.03 KiB) Viewed 294 times

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08 Jun 2020, 17:49


So I was able to have the new lower housing part printed. The spring that I got now fits.
Can't remember if I mentioned this was the spring I got ... ring-steel

Its a bit heavy, but will work for now.
spring fits.jpg
spring fits.jpg (2.65 MiB) Viewed 229 times
The tape on the 3d printing bed came up with the print. A curious colour and a sign of things to come.
Blue tape stuck to bottom.jpg
Blue tape stuck to bottom.jpg (4.14 MiB) Viewed 229 times
So lets assemble it
pieces for fit test.jpg
pieces for fit test.jpg (4.95 MiB) Viewed 229 times
It fits and works!
it works.jpg
it works.jpg (2.6 MiB) Viewed 229 times
Of course almost immediately a corner tab broke
top down already broke a tab.jpg
top down already broke a tab.jpg (2.59 MiB) Viewed 229 times
I reused the shipping foam from the professional bigswitch to hold it
makeshift foam holder.jpg
makeshift foam holder.jpg (2.5 MiB) Viewed 229 times

So prototype number 1 is complete!

What is next
Redo the lower housing in the fusion360
Redoing the switch plate in fusion360
Deciding how to do the electrical connection part. I may get the 2 switch plate pieces water jet cut from steel, unsure.
Testing if the various thicknesses of steel can handle the deformation/metal leaf piece
Get the square cutter I ordered to make the leafspring nicer.
Reliably generate the bump in the leafspring that presses the switch plate
Reduce upstroke click

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11 Jun 2020, 04:31

I love it. The video looked very satisfying to click! My next fidget cube.

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