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as vacuum paths and aid in chip removal Part-holding pins should be an interface fit in subplates and snug to loose-fit in the part, depending on cutting technique used (Fig 3511) It is recommended that the programmer generate the tooling and hold-down pinholes in addition to the routing program That will provide absolute registration between the tooling holes and the routing program 3547 Cutting and Holding Techniques Since the precision required for cutting board outlines, as well as the placement of tooling holes for registering boards, will vary, a number of different cutting and holding methods may be used Three basic methods are illustrated here Experimentation will determine which method or combination of methods is most applicable to a particular job With all methods, the minimum dimension for board separation with a 0125 in cutter is 0150 in.

(6.28)

No-internal-pin method If no internal tooling pins are used, the procedure of Fig 3512 may be employed, but it is normally used only when no other method is possible Characteristics of this method are as follows: accuracy, 0005 in; speed, slow (best used with many small parts on a panel); load, one panel high for each station FIGURE 3512 No-internal-pin method Step 1: Cut Single-pin method The single-pin method is illustrated in three sides (a) Step 2: Apply masking tape (b) Step 3: Fig 3513 Characteristics of this method are as follows: Cut parts away accuracy, 0005 in; speed, fast (quick load and unload); load, multiple stacks Double-pin method In the two-pin method, there is a double pass of cutter offset; see Fig 3514.

Make two complete passes around each board, the first pass at a recommended feed rate and the second at 200 in/min Remove scrap after the first pass Characteristics of this method are as follows: accuracy, 0002 in; speed, fast (highest-accuracy system loads and unloads slower than single-pin method due to tight pins); load, multiple stacks..

Scoring is a circuit board fabrication method used to make long, straight cuts quickly, and therefore is often used to create rectangular profile board shapes. More commonly, however, it is used in concert with CNC routing for complex shapes, enabling each tool to be used to its unique advantage. When used with routing, scoring has a much wider application and can provide simple breakaway for complex profiles (Fig. 35.15).

Routed features Module or panel Routed features Score lines Score lines (a) (b)

FIGURE 35.15 Scoring processes: (a) module or panel with typical scoring lines and routed corners; (b) scoring lines and routed complex features.

Scoring Application Scoring is accomplished by machining a shallow, precise V-groove into the top and bottom surfaces of the laminate, generally with the use of CNC equipment. The two most significant elements of the score line are as follows:

The positional accuracy from the reference feature (usually the registration hole) The depth of the score, which determines the web thickness

Disaster recovery And who knows what else!

The final edges of a scored circuit board are yielded by breaking the panel, or border, at the score line (Fig. 35.16). The angle of the cutting tool is reflected in the V-groove geometry, and limiting this angle to 30 to 90 will minimize the score line intrusion into traces near the edges of the circuit board. The score line exposes the laminate glass fibers and resin. Measurements from these surfaces will vary greatly, even though the score line is precisely machined

(Fig. 35.13). These irregular surfaces will be noticed as dimensional growth and should be considered in design or planning when designated as a scored edge. Positional accuracy Board cross-section Registration hole or dimension hole Misalignment Web Score depth To break 30 90 The dimensional accuracy of the final board is determined by the degree of precision with which the following are performed:

Misalignment within 0.003 in. of the score line from the desired location Web thickness within 0.006 in. of the designated dimension

Typically, a nominal web thickness is 0.020 in. for 0.060 in. thick FR-4 boards and 0.014 in. for 0.030 in. thick FR-4 laminate. For CEM-1 or CEM-3 materials, 0.040 in. and 0.024 in. nominal web thickness values apply, respectively. These web thickness values enable sufficient module strength to avoid accidental or premature score separation while providing simple breaking efforts without excessive edge roughness or growth.

Operation Two major types of panel scoring systems are available:

Dedicated CNC scoring machines utilizing high-speed carbide or diamond-embedded cutter blades, operating as a pair, one on each side of the board. This generates the V-groove on each side simultaneously Drills or driller/routers equipped with scoring software and spade type carbide bits, generating score lines on one side of the panel at a time (Fig. 35.14)