Guides / Design and Fit
What Each Keyboard Mount Costs You on the Machine
September 21, 2026
Every mounting style discussion in the keyboard community is about sound and feel. This one is not. This is what each mount does to the quote, the schedule and the scrap pile, which is worth knowing before you commit to a design.
Tray mount
Standoffs are machined into the bottom case and the plate screws down to them.
Setups: the fewest. The standoffs and their tapped holes sit on one face, so much of the work happens in a single orientation.
Tolerance risk: low. Standoff height variation of a tenth of a millimetre changes nothing a typist can detect. The plate is screwed flat against whatever the standoffs actually are.
Scrap risk: low. The critical features are inside the case where a witness mark does not matter.
What to watch: the standoff pattern has to match your PCB, not a generic layout. Tapped holes in aluminium that get unscrewed repeatedly will strip eventually, so ask about thread depth or inserts if the board is meant to be taken apart often.
Tray mount is the cheap, reliable option, and there is no shame in it for a first run.
Top mount
The plate screws to bosses in the top case, so the top half carries the assembly.
Setups: more than tray mount. The bosses are on the inside of the top case, which is also the part with the most cosmetic surface, so the part gets flipped and refixtured.
Tolerance risk: moderate. Boss positions have to agree with the plate holes, and both have to agree with the PCB.
Scrap risk: higher than tray mount, for a specific reason. The bosses are machined on the part that everybody looks at. A setup that shifts slightly leaves a step or a mark on the outside, and that part is scrap.
What to watch: say clearly which screw heads are visible from the top. A recess that is cosmetic gets a different finishing pass from one that is hidden, and the shop cannot tell from the model.
Gasket mount
The plate is held between gasket strips seated on shelves in the top and bottom case.
Setups: similar to top mount.
Tolerance risk: this is the one. Shelf depth controls how much the gasket compresses, and compression is most of what people hear when they describe a gasket board’s sound. A shelf half a millimetre deep than drawn gives you a different keyboard.
Scrap risk: moderate on the machining, higher on the finish. Both halves have to anodise to the same colour because they sit against each other with a visible seam.
What to watch: put a real tolerance on the shelf depth rather than letting it run at a block tolerance. Design the shelf around the gasket in its compressed state, not its free thickness. There is more on this in designing a gasket mount case a shop can cut.
Leaf spring
Flexible arms machined into the case hold the plate, giving compliance without a separate gasket.
Setups: comparable to top mount, but the operations are slower.
Tolerance risk: high, and different in kind. The arm thickness controls the spring rate, so a thickness error is a feel error, and the acceptable band is narrower than most designers realise.
Scrap risk: high. Thin arms chatter if the feeds and speeds are not right, and chatter leaves a visible witness pattern. Chatter also means the arm is not the dimension you drew.
What to watch: the spring rate depends on the alloy. An arm tuned for 6061 will behave differently in 6063. Prototype it, flex it, and expect to adjust.
Integrated plate
The plate is machined as part of the case rather than as a separate piece.
Setups: the most, usually, because the switch cutouts and the case geometry are on the same part in different orientations.
Tolerance risk: moderate, but consolidated. There is no plate to case fit to get wrong, which removes one whole class of problem.
Scrap risk: the highest of any mount, and this is the decisive point. The switch cutouts and the outside of the case are now the same part. A mistake at the last operation scraps everything done before it, including all the cosmetic work. There is no rework.
What to watch: cost the scrap honestly. An integrated plate case is not just more machine time, it is more value at risk in every single part.
A rough ranking
From cheapest and safest to most expensive and riskiest to produce: tray, top, gasket, leaf spring, integrated plate.
That ordering does not tell you what to design. Plenty of excellent boards are gasket mount and a few great ones have integrated plates. It tells you what to budget, what to prototype and where to spend your attention on the drawing.
If this is your first run, the honest advice is to design the mount you want and then ask a shop to quote it alongside a tray mount version. The difference in the two numbers is the price of the design decision, and it is better to know it than to guess.
See also: keyboard mounting styles and what each costs to machine, with a cost factor and a modelled price band for every mount.
Frequently asked questions
Which mount is cheapest to manufacture?
Tray mount, clearly. It needs the fewest features in the most forgiving places and it tolerates dimensional variation better than any other mount, so the scrap rate is lower too.
Is gasket mount much harder to make than top mount?
Not harder, but less forgiving. The gasket shelves have to be dimensionally consistent because shelf depth controls compression and compression controls the sound. A top mount can be a little out and still feel identical.
Should a first time designer attempt a leaf spring case?
Not as a first run. Flexure arms need a feed and speed plan or they chatter and leave visible marks, and the geometry has to be tuned for the specific alloy. Make something conventional first, or budget for two prototype rounds.
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