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BOARD OUTLINESThe standard tolerance is +/- 0.1mm
We rout to your board size using the center of the board outline. Tighter tolerances are available upon request. ROUTING
The default rout tool diameter is 0.03" ( 0.7mm) INTERNAL CUTOUTS
For plated slots, the minimum width is 0.016". Your design can have both plated and non-plated internal cutouts. We suggest that you add one layer for each type of cutout (plated or non-plated). Just place elements in these layers that are the exact shape of the cutout that you want. For example, if you want a 0.050" x 1.00" slot cutout of the board, then just add a trace of this size to the appropriate layer. If you have a more complex shape, then just submit it as one or more polygons that describe the edge of the cutout. We suggest you draw the polygon with an "F-Type" shape (a line of zero width). If you choose, you can draw the polygons with any width trace. We assume that the centerline of the trace describes the edge of your internal cutout. Plated cutouts will have the inside of the cutout plated with the finish that you choose (Tin/Lead HASL or ENIG (Immersion Gold)). Non-plated cutouts will not have any plating on the internal edges. Name your plated cutouts layer "PlatedInternalRouts". Name your non-plated internal routs "NonPlatedInternalRouts". If you wish, you can also supply a drawing that details the internal cutouts and we will create the needed geometry for you. SOLDER MASK SWELLThis is the expansion of mask relief over pad area. Our minimum is 0.004” over pad dimension or 0.002” each side. PCB Unlimited will modify files to meet the minimum dimension. When manufacturing your prototype circuit boards, there may be a small misregistration between the solder mask layers and the underlying copper layers. As a result, we recommend that you swell your solder mask layer so that it is 0.004” (0.002” on a side) larger than the underlying copper elements. This way, if there is a misregistration, then your copper pads will not have any solder mask on them. You should also ensure that your design has a "Minimum Web" of at least 0.003" between adjacent pads. Smart DFM can pinpoint any problem areas for you. SILKSCREENWe recommend that your silk screen features have a width of at least 0.005", although the absolute minimum for clear legibility is 0.003". If you submit Gerber data or a .bin ViewMate file to us, then we will modify your silk screen layers if any features are less than 0.005". If possible, we will set all features so that the minimum trace width is 0.005". Where this is impractical, we will reduce the silk screen feature size to a minimum of0.003". COPPER TRACE WIDTH/SPACING
This is the minimum air gap between any two adjacent copper features. Trace width is the minimum width of a copper feature, usually traces. CONDUCTOR WIDTH+/- 20% MINIMUM ANNULAR RINGThe minimum annular ring on vias is 0.004" (4 mils) each side of the hole. The pad must be large enough to tent over the hole otherwise you may lose the metal in the hole during outer layer etching resulting in plating voids. FINISH THICKNESS
Overall thickness tolerance is +/- 10% (The overall thickness is greater than 0.040") Note: we assumed the copper weight on each layer is 1oz. HOLES SIZESAny hole size between 0.004" and 0.250"
I.C.T is a manufacturer of SMT machines. It mainly provides customers with SMT production lines including SMT Stencil Printers, Pick and place machines, Reflow Oven, AOI Machine, Wave Soldering Machine and PCB Handling Machine etc. I.C.T has more than 25 researches on SMT and DIP technology, for the world Customers provide SMT total solutions. There are successful cases of SMT technical team in Asia, Europe, America, Africa, and Australia. I.C.T provide SMT solutions at various stages according to the different needs of customers. I.C.T is not only a provider of SMT equipment and technology, but also is the customer's escort in the field of SMT and DIP. Welcome more people to discuss with us about SMT technologies and solutions, please contact us for more information: Tel: +86 13670124230 (WhatsApp/Skype/WeChat) Email: etasmt@foxmail.com
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文章From:http://www.suneastsmt.com/te_news_industry/2021-09-15/30166.chtml |