label: pcb design novice,Printed-circuit board
1-sided pad:
Do not fill the block to act as a pad surface mount components, should be one-sided pad, the pad is not usually one-sided drilling, so the aperture should be set to 0.
2 vias and pads:
Do not use pads instead of the through-hole, and vice versa.
3 Text requirements:
Labeling and other characters on the pads should be avoided, especially in surface mount component pads and pad on Bottem layer printed characters and should not marked. If the space is too small it can not be put on the character and the need to pad nor declare whether to retain the special character, when we do the board will cut any part of the pad character on Bottem layer (not the entire character resection) and resection TOP layer on the surface mount component pads on the part of the character, in order to ensure the reliability of welding. Printed characters on the big copper, HAL India after the first character, the character does not make cuts. Board shall be made to delete the character processing.
4 solder green oil requirements:
A. Any design according to specifications, weld pads to represent elements, these pads (including vias) are not on the solder automatically, but if the block when the table is filled with a paste with the line when the finger pad or plug, without special treatment, solder pads and oil will mask these finger, likely to cause misunderstanding error.
B. In addition to the circuit board pad, but if you need some regions not on the solder resist ink (ie special solder), it should be on the corresponding layer (the top layer of paint in the Top Solder Mark layer, the bottom of the painting at Bottom the Solder Mask layer) with a solid graphics to express not the solder mask area. For example, a rectangular area to be exposed in a big tin copper surface Top layer, you can draw directly on the Top Solder Mask layer solid rectangle, without editing a single-sided pad to express not on the solder resist ink.
C. For BGA boards, through-hole pad BGA pad next to the component surface shall be covered green oil.
5 Shop copper area requirements:
Whether it is a large area of copper to make solid copper mesh or shop requires board edge distance greater than 0.5mm. For copper grid mesh size no larger than required 15mil × 15mil, namely mesh parameter setting window in Plane Settings (Grid Size value) - (Track Width value) ≥ 15mil, Track Width values ≥ 10, no copper grid if the grid is less than 15mil × 15mil in production is likely to cause the circuit board other parts of the open, you should shop solid copper, located fixed: (Grid Size value) - (Track Width value) ≤-1mil.
6 Outline of expression:
Figure contouring should Mech1 layer rendering, as the board has shaped hole, square grooves, square hole, also painted on Mech1 layer is best to write words in the tank and the size of the CUT, in drawing the square hole, square grooves, etc. To be considered a turning point and the endpoint of the arc machining contour lines as CNC milling machine, cutter diameter is generally φ2.4mm, a minimum of not less than φ1.2mm. If you do not have 1/4 arc to represent a turning point and rounded end, should be marked with an arrow on Mech1 layer, and please mark the final appearance of tolerance.
7 long hole opening on the pad expression:
Should be set to the width of the aperture pad drilling long holes and long holes on Mech1 layer draw the outline of note are two arcs, considered a good mounting dimensions.
8 metal and non-metallic bore holes expression:
Through layer pad holes generally do not have any description, will make the hole metallization, if you do not make the hole metallization layer please marked with arrows on Mech1 and text. For shaped holes in the plate, square grooves, square hole, etc. If the edge of the copper foil surrounded, please indicate whether the hole metallization. Next hole as large as conventional pads or no pads and no electrical performance and because the holes deemed non-metallic holes.
9 How to set the time element is a square foot hole size:
When the pin is generally square side length is less than 3mm, can be fitted with a circular hole, the aperture should be set slightly larger than (considering moving with) the square of the diagonal values, do not set a side effect, otherwise can not be assembled. For larger square foot square hole should draw contour lines in Mech1.
10 When the multi-block panels painted in a different file and want to split delivery please Mech1 layer of each plate to draw a border between the plates remain 100mil spacing.
11 drilling pads minimum aperture settings and relationships:
General pre-wiring components should be considered when placing elements foot diameter, the diameter pads, vias and through-hole disc diameter aperture, so cloth finish line and then modify the inconvenience. If the pad diameter of the finished hole components is set to X mil, the pad diameter should be set to ≥ X +18 mil.
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