Cutting Printed Circuit Board Stock

Shears PCB stock can be cut with large handheld shears such as Wiss offset aviation snips. Beverly shears are better. Shearing is nice because it avoids the contamination of the area with fiberglass particles which are extremely irritating to the skin and a serious danger in the eyes.

Saws Hacksaws, circular saws, and just about any other sort of cutting tool can be used to cut PCB stock, but the glass based boards (FR#) will dull a cutting edge quickly and the particles are extremely irritating to the skin and a serious danger in the eyes.

Tile saws are designed to be run wet, and the water can help to contain the particulates. Very fine blades (sold for cutting gem stones) are available.

Milling professional PCB houses typically CNC Mill stock with a lubricant which collects the particulates and keeps them out of the environment. More: Printed Circuit Board Milling Machines

V Scoring deeply scoring the board on both sides can allow the board to be "snapped" with a quick motion while half the board is supported on a strong, flat surface. Many users report a very ragged, rough edge.

score depth

-- Ed Valentine on 2001-08-07 Electronics Manufacturing Solutions

Assuming you are going to do a manual breakaway of the boards, I recommend a final web thickness of 0.012" with 30 degree cutters on FR4. If you are using mechanical/machine separation you can go slightly thicker. The thin web thickness allows for easy, manual breakaway with minimal potential damage to the components and the solder joints.

http://www.ems-consulting.com

Gary Ferrari on 2001-08-07

Please take note that your respondents have discussed the material "remaining" after the scoring process. Your drawing should not indicate a depth requirement, but the amount of material remaining.

Pocket Guide to Excellent V-Scoring http://www.accusystemscorp.com/FAQ's%20-%20Index.htm ``useful'' -- recc. Bill Brooks 2001-08-07 PCB Design Engineer http://home.fda.net/bbrooks/pca/pca.htm

Scroll all the way to the bottom of the "Reflow Skillet tutorial" http://www.sparkfun.com/commerce/present.php?p=Reflow%20Skillet for some nice close-up photos of a "scored" PCB panel.

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