类型: IC
作者: Windeh
发布时间: 2019-01-27 09:39:24
更新时间:
2019-04-06 05:14:51
原链接:
https://geekhack.org/index.php?topic=99158.0
- 27th Jan 2019
- Interest Check Form - Please fill in*
This is the Interest Check thread for the Omega 60, a
Floating Bagel Sandwich Mounted 60% Custom Keyboard kit.
The
mount for this board will be identical to my last 2 designs,
Reflex & Paradox. For more info on the mounting system,
please check out the link below:
https://geekhack.org/index.php?topic=97859.msg2672186/#msg2672186
This IC will focus on updates and changes from my
last design, while addressing some skepticism on the smol
brane spacebar cutout for the plate.
Having experiences
from designing the Reflex & Paradox, and with several
prototypes made, I focused on maintaining the essence of the
original designs, while streamlining and refocusing the
overall package.
Design Highlights:
-
Weight - The internal weight have been maximized within the allowable space, with a fully built weight of 2.2kg (4.85lbs), in a relatively compact and low profile footprint.
-
Mount & Plate - Mounting and plate designs are unchanged, as the design works wonderfully.
-
Chassis rigidity - With additional material in key areas, without exposed weight or cutouts, and tighter tolerance between the case top and bottom, together with the increased weight and small size, the board feels incredibly substantial and rigid in hand and whilst typing.
-
Ease of assembly - Putting together and taking apart the Omega 60 is effortless, with only 10 screws to assemble, and only 6 are structural. All 10 screws are of the same standard size and length, so no mistaken screw lengths, and just 1 bit size.
-
Reduced bezel gap
-
Objective - To hide the screw holes while keeping the rear angle*
Feel free to skip this section if you don’t care for the design of this board.
More
Looking at how past keyboard designers dealt with screw
holes, some chose to hide them, and are limited by the
location of the screw hole in terms of how much rear angle
they can play with, while others choose the opposite path,
and proudly design around the exposed screws for a more
industrial looking board.
I wanted to keep the angled
look of my first 2 designs, while hiding the screw holes.
The Reflex had exposed screw holes, and the style suited the
“louder” design. The Paradox used weights to hide the screw
holes, however the design was expensive to manufacture and
to fit correctly, and it requires you to remove the weight
before being able to remove the case top screws, increasing
assembly time & complexity.
I thought to use a
nameplate to cover the screw holes, however was uncertain on
how to keep the plate in place, while allowing easy removal
for quick access. Screws was of course the obvious choice,
however this defeats the purpose of hiding the screw holes
in the first place.
Magnets comes to mind, however the
nameplate material is not magnetic, and to stick a magnet
onto the plate using epoxy, then stick another piece of
magnetic material onto the case would not be very elegant.
How to then remove the plate is another concern.
I
ultimately came up with the “clamp” design. The plate is
simply dropped into the recess, and the 3 clamping screws
are tightened to secure the name plate. The tolerances of
the nameplate must be very accurate to not cause excessive
deformation of the clamping mechanism, so each name plate
will be hand fitted to their respective cases.
To remove the nameplate, simply slightly loosen the 3
clamping screws, and the plate will be free to drop out.
While
the tolerances between the nameplate and the plate recess
will be kept to less then 0.2mm, the clamping mechanism can
accommodate up to 0.5mm of deformation without damage, and
will return back their original position upon loosening.
The “Smol Brane” spacebar plate cut
There are some discussions within various Discord
channel on the questionable design decision to place a
mounting point directly below the spacebar, then to try and
fix the stiffness by disconnecting the spacebar switch from
that mounting point with a plate cut, potentially increasing
complexity of the design, and ultimately the cost to
manufacture.
I will break down how this design came to
be, with some Displacement (Flex) Simulation, uniform 10N on
surface / Rigid mounting points:
Goal for plate design -
- Reduce rigidity of the spacebar switch plate position
- Maintain overall uniform switch sound and feel (flex) across the Alphas and the Spacebar area of the plate.
- Have the least amount of complexity to achieve the above goals.
-
Simulation 1* - Full mounting position, no
disconnect cut
More
While the alphas are “somewhat” uniform in their
displacement, the spacebar switch position are super rigid,
as is expected.
Simulation 2 - Full
Mounting Position, WITH disconnect cut
More
The disconnect cut successfully reduced the rigidity
of the spacebar switch position, while also reliefs the
center portion of the plate for more uniform displacement
across almost the entire Alphas area of the plate.
Simulation 3
- Remove the bottom center mounting position entirely
More
Without the center bottom mounting position, the
plate experiences vastly inconsistent displacement, with
much more flex closer to the spacebar cutout, and stiffens
out across the whole plate towards the mounting points.
I
hope with the above, somewhat simplistic simulations, that
we can agree that a simple cut which adds about 0.5 dollar
to the costs of the plate, is the most cost effective
solution to the rigid spacebar problem, without negatively
affecting the consistency of the typing experience.
//* Whilst I’m not trying to simulate every detail from the
switches, keycaps, stabilizers and every component on the
PCB etc, however given that those are pretty evenly spread
out across the plate and are consistent, with the only
variable being the plate design, the simulation serves its
purpose to demonstrate and gives a visualization of the
areas of relative flexibility between different plate
designs. //*
Spec:
- Case material: 6061 / 5052 Aluminium (TBC)
- Weight material: Sandblasted & Clearcoated Brass
- Plate material: Anodized Aluminium in Deep Red or Royal Blue / Sandblasted Brass (Optional)
- Screws: YFS Grade 12.9 Alloy Steel Hex Black Oxide Screw AND THE SS 316 A4 Stainless Steel Screws - Only the best fasteners
- Color Options: Standard anodization Black / Dark Grey / Deep Red / Royal Blue
- Nameplate Material: Brushed 304 Stainless Steel
- Fully built weight with Brass Plate: ~2.2kg (4.85lbs)
- Layout: R1 will be unblocked top only - Tsangan layout with optional split backspace & stepped caps lock
- Angle: ~7 Degrees
- PCB: Not included. Satan GH60 PCB can be purchased for $38 with GB, or $30 from KBDfans
- Base kit price: $350 for Paradox/Reflex participants, otherwise $380 (4% PayPal Fee & Delivery cost not included)
- R1 Slots: 18 Sets
-
GB Date: Sometime after CNY
Feel free to comment below, let me know if I’ve missed anything, and do discuss your concerns with my design here, as it can be hard to catch up with your comments in the Discord channel.
- Extra photos and renders:*
More
