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Tight fitting Backplane dimensions (IEEE 1101 Subrack) / Panelizing
Hello,I'm constructing a modular backplane for a 19'' subrack. Each slot, 4 units wide, has it's own backplane segment which houses the DIN 41612 connector.
The standard IEEE 1101.1 tells me the width of a 4 unit frontpanal should be: 4 x 5.08 - 0.3 [+0 / -0.2] = 20.02 mm
I'm planning to order in PCB manufacturer in China. They specify their outline milling / v-scoring precision at ±0.2mm.
Please have a look at the attached picture of the board.
The curved shape of the board is my solution to the 7.62 mm distance from the sidewall of the subrack to the first mounting hole. The boards are supposed to be mounted very easily. This way you can just align the first one to the side wall. (I hope 
)
My questions are:
How much clearance should I have between each segment so ensure them fitting nicely besides each other?
I want to panelize the boards before manufacturing. Would you put the V-score at the top and bottom? The boards have to fit exactly in the subracks mounting rails. (128.7 mm +0/-0.3)
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