Double Sided

[Mark Roberts]

I've been trying the double PCB feature, and I appear to be .1055" off on the mirror (for bottom side).

I have my copper clad in an aluminum jig with 4 mirrored screw holes, the jig itself is bolted down to waste board.

I import a boarder/hole template for the copper clad, then import both my top and bottom layer gerbers. I offset these layers, such that they are positioned on my ‘copper template’/boarder/reference where I want them to be milled.

Following the manual, I select my bottom layer, mirror around x axis, select box then select the copper clad template.

I do isolated run on top layer, then I flip board, such that if the circuit being milled (top layer) was located near the bottom of the copper clad sheet, after flipping, it would be near the top of the copper clad and upside down (top layer)…but after trying very simple circuits, each time after I flip, it's as if my y dimension is off about an 1/8 of an inch.

Any ideas on whats going on?

[Juan Pablo Caram]

This is not a proper issue description. Next time please follow the instructions. All environment information is missing and it cannot be reproduced because it is specific to your setup.

For the time being... I would guess that the mirror axis of your screw holes is not the exact center of the "box" in your copper clad template. When you select "box", it will mirror through the middle of such box. If this mirror line is not at the exact same distance from both screw holes you will end up with an offset between the two sides.

[Juan Pablo Caram]

Please provide evidence (screenshots, extracts of gcode/gerber/excellon) that there is problem with the program.

[Mark Roberts]

Copper sheet template

[Mark Roberts]

Test PCB, with offset on sheet at (165.1,42.5)

[Mark Roberts]

The copper sheet is held down in an aluminum jig that has a pocket cut out to fit the 9x12" board and a phenolic sheet underneath it. Tapped 4-40 holes are in the aluminum jig. at (6.35,6.35),(6.35,222.250), (298.477, 25.40), and (298.477, 203.20) these holes will be in every copper sheet I mill out. When I was performing the double sides action, I was not using alignment holes, just the boarder of the copper clad.

[Juan Pablo Caram]

Please include screenshots to show what you are doing.

[Juan Pablo Caram]

I could not find any problems with the data provided.