Design for Machining on the CNC Machining Center(cont.)

D: Deep Narrow Slots.  Deep Narrow Slots can be costly to mill due to chip packing and use of small cutters. Avoid if possible   

E: Flatness Across Large Distances  Flatness is easier to maintain across large distances by the use of bosses.  

F: Break-Out Holes.   It's usually better to use a small slot in this case. The drill would tend to wander or walk when drilling on an edge.See Mr. Do Mill 

G: Square Corners  Square Corners are expensive to make. If possible, use a radius in one corner or drill a relief hole.  

H: Blended Radii on edges  It's much cheaper and faster to use chamfers in this case.  

I: Small Radius in Corner  A small long radius in a corner invites tool chatter and breakage (see View 12). If possible, run radius on shorter corner or spec a larger corner radius.  

J: Over Toleranced Dimension  3 places after the decimal is usually interpreted as plus or minus .005" Close enough for most needs. The use of extra places can add cost and confusion.  

K: Full Tap Depth  Drill depth should be at least 3 thread pitches (turns) deeper than tap depth, if possible. A bottom tapped hole should be avoided if not absolutely necessary. Through holes are even better. 

L: Simplify Parts  Consider making multiple simple parts instead of one complicated part. 

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