We are assembling a touch screen assembly into a smart phone chassis.
Requirements:
- Touch screen is centered in chassis (equal gap all around).
- Touch screen and chassis assembly thickness needs to be repeatable.
How would you solve the problem?
Here is my stab at this.
I am tolerancing both the display itself and the housing.
The display uses the front face as datum A and the rear mounting surface references datum A with a tight profile to keep the thickness consistent.
The housing uses the displays mating surface as datum A and the front face references datum A with a tight profile so that our display never sticks out beyond the housing by more than .005"
For centering, both the housing and the display use widths to create center plane datums. This will ensure the profile tolerance that references datums A B C are all relative to the center point of the display, keeping everything centered. This will keep the gap between the display and the housing at < .010".
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To clarify, this question is not about tolerancing but more about design. What kind of features are on the display and chassis such that:
- Touch screen is centered in chassis (equal gap all around).
- Touch screen and chassis assembly thickness needs to be repeatable.
I don’t know this answer either, but would like to try for this as well.
I think tolerance matters, but I’m guessing it means to help prevent tolerance stacking.
I would probably ask if we can add anything to the design to help with alignment. I’m thinking this is more of an alignment feature. I would have a feature on the chassis to help with alignment, maybe some gaskets/trim to give it uniform thickness around it. screws that go into sloted holes help with alignment and pins also help as well. Solid adhesive glues help with alignment and prevent the runoff of the glue to help secure it in place. Giving it more room inside the housing would allow these features to align the piece better.