Ho-Cheng, H., and Dharan, C. K. H. (August 1, 1990). "Delamination During Drilling in Composite Laminates." ASME. J. Eng. Ind. August 1990; 112(3): 236–239. https://doi.org/10.1115/1.2899580

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TTC PRODUCTION 10-082-002 1/4" Dia., 202 ANSI, 1/16" Face Width, High Speed Steel, 8 Teeth Woodruff Keyseat Cutter

This piece set is great for drilling holes in metal clay.

Mercury and copper are sometimes included as noble metals. Silver and gold, which with copper are often called the coinage metals, and platinum, iridium, ...

Drilling of composite partsby hand

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Use a drill that will produce a 75% hole size where after-tap minor diameter gaging to 2B or 3B tolerances is required. deterMining drill Size. Thread forming ...

Arbor for CNC carbide-tipped saw blades. For use on routers and machining centers with CNC control.

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Drilling of composite partspdf

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Delamination is the major concern during drilling of composite laminates. Delamination, in addition to reducing the structural integrity of the laminate, also results in poor assembly tolerance and has the potential for long-term performance deterioration. Drilling-induced delamination occurs both at the entrance and at the exit planes. This paper presents an analysis of delamination during drilling. The analysis uses a fracture mechanics approach in which the opening-mode delamination fracture toughness, a material parameter, is used with a plate model of the laminate. The analysis predicts an optimal thrust force (defined as the minimum force above which delamination is initiated) as a function of drilled hole depth. Good agreement is achieved with data obtained from drilling carbon fiber-epoxy laminates. An advantage of the model is that it can predict varying degrees of delamination for other materials, such as glass fiber-epoxy, and for hybrid composites. In addition, the optimal thrust force for no delamination can be used to control a drilling machine with thrust force feedback for maximizing productivity.

Woodruff Keyseat cutters are designed for cutting keyways and keyseats as well as performing general purpose milling operations. Staggered tooth cutters can take deeper cuts and have better chip ejection that straight tooth cutters. Cobalt works great in all types of materials and will give much better tool life than M2 or M4 high speed steel tooling.Shank tolerance is .500 +.000 -.0005Cutting diameter tolerance is +.010/+.015 (industry standard for all Keyseat cutters)Width tolerance is +.0000 -.0005 (Industry standard)