Backplane Mechanical Issues

[gravelpitman]

Incorrect mounting hole spacing

Crate dictates a hole spacing of 122,1 as shown above

Hole spacing in PCB shown above.

The difference of 0.4mm is too big in my opinion.

Placement of the coordinate system

This placement does not make sense. In my opinion, the location of the coordinate system should be in the mounting hole, for example, in the lower left mounting hole. This location provides any possibility to calculate the correct location of connectors, (16,6mm between modules and backplane orgin i Y axis)

Not using meaningful units of measurement (mm)

Please use max 0,01mm incremenst (thousandths of a millimeter)

Guideline for creating revisions

-Correct holes placement

Please make them as shown above.

-TOP connectors

Every dimension measured between the connector orgin and PCB orgin

-TOP Guides

Guide X axis orgin same as mounting holes Every dimension measured between the guide orgin and PCB orgin

-BOTTOM connectors

Every dimension measured between the connector orgin and PCB orgin

-BOTTOM Guides

Every dimension measured between the guide orgin and PCB orgin

The assumptions I made regarding crate assembley

1. Modules inserted symmetrically The picture shows symmetrical clearance in the X axis of the entire crate and symmetrical clearance i Y axis of crate

2. Maximum Misalignment of AMPHENOL 51940-650 according to the manufacturer's designation (datasheet: https://cdn.amphenol-cs.com/media/wysiwyg/files/documentation/bus-20-067.pdf , 13/24)

[filipswit]

@gravelpitman can you verify mechanics?

DIOT_Backplane_v1([No Variations]).zip

[gravelpitman]

@filipswit Now placement of connectors is correct. My only complain is the positioning of the top and bottom edges in relation to the PCB orgin. Please move only edges of PCB.