c) Design system holes form angles (Angle holed design)
With this design, it is very dangerous if the shavings during drilling angle holes were trapped at the junction surface would limit the flow of nature coolant flow through the core.
d) Cooling system gradually form hole (stepped hole design)
- this system is easy to design than systems Angled hole, but the downside of this system is that after the hole was drilling to seal one end to regulate the flow; However, sometimes, may be damaged resulting in leakage.
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