类型: IC
作者: yuktsi
发布时间: 2015-11-03 08:04:28
更新时间:
2015-11-11 20:54:51
原链接:
https://geekhack.org/index.php?topic=76672.0
I will share about the my findings from samples made of
different aluminum, i.e. Alcoa Mic 6, 6061 and 7075, some
comparisons and why I decided to use 7075 for the next
batch, some major improvements over the last run (such as
the wrapping issues, the gap, the finishing of the brass,
etc.), changes in design, price of the kit and delivery
period.
The groupbuy should start next week if nothing
goes wrong, in order to have the board delivered before
Christmas. Stay tuned!
Material selection
from top: 6061, Mic 6, 7075
6061 is one of the
most common aluminum alloys used for Korean keyboard, being
economical, reasonably high strength and easy to machine.
While 7075 does offer a much better mechanical properties
compared to 6061, but many do agree that the additional
strength is not needed for the usage of mechanical keyboard
case. Alcoa Mic 6 on the hand, is best known for its good
stress relieving properties, commonly used to machine parts
that require high accuracy.
tl;dr
- stregth
7075 > 6061 > Mic 6 -
price
Mic 6 >> 7075 > 6061
To determine the aesthetic appeal of different materials, all 3 materials went through the same process of machining, sandblasting and hard anodizing (35 micron). The major differences in the final products are the color and surface smoothness. -
Color
from left: 7075, Mic 6, 6061 -
Surface smoothness
7075
6061
Mic 6
Taking aesthetic appeal, price and strength into consideration, 7075 will be used in the next groupbuy.
Improvements
-
Gap
It is much more appealing than round 1. Although no one has made a complain about the gap, but it does bother me a lot. -
Brass finishing
mirror finish
normal buffing
electro nickel plating
The brass for CE will be electro nickel plated. I have not decided on what kind surface to go for thought (sandblast or mirror polish) -
wrapping issue
As you can see form the photos, the top part lies flatly even though it is not screwed to the bottom case. -
Anodize color variation
As much as I want a perfect anodize for CE, unfortunately it is not possible. What I can do is only to minimize the color variation.
mic 6 sample. To give you an idea, the above variation in color is not acceptable.
Changes in design
thinner border
the usb hole
this is something i learnt from the OTD board. The
mounting point of the plate. The plated is mounted at an
very small angle, to reduce the contract surface with the
case for maximum “thock”
Specifications:
- Full aluminum 7075 case
- 8 degrees slope
- Electro nickel coated brass weight
- Plate material: aluminum
- Support 84 and 86/87 layout
- ISO and ANSI
- A87U PCB
- Fully Programmable
- Full LED backlighting
- Controller parts are pre-soldered
- Only 25 sets
-
Color options:*
Blue grey, pink, black(hard anodize) and olive green(hard anodize)
blue grey
pink. photo by filphil
olive green - Price:*