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Andrew Johnston	06/11/2010 21:08:25
7061 forum posts 719 photos	D.Eng: That's a damn good question, and one to which I don't have an answer. Only they know that. Given that a lot of their work involves waveguides, and hence talking to electronics and radio types, I assume that they thought the same of me. Presumably they weren't expecting to be questioned about cutters, speeds, feeds and in what order they machined things, oh and why didn't they try this type of cutter? Regards, Andrew
Steve Garnett	06/11/2010 22:02:40
837 forum posts 27 photos	Hmm. If Andrew gave them the link I posted at the start of this thread, at least they'd have some sort of idea what sort of roughness grade they were going for...
Andrew Johnston	07/11/2010 12:10:27
7061 forum posts 719 photos	Michael: All very sensible suggestions. Before we placed the order, we visited the machine shop in question. It's only a few miles away, which was one of the reasons for selecting them. We took one of the prototype heatsinks that I'd machined, so that they could look at it and ask questions. We also explained it's purpose and the finish required. It's may be slightly ironic that the finish on other parts of the heatsink is better than that where the IGBT module goes. Still at least they're doing better than the sheet metal company we're dealing with; 'order, what order, we didn't know you'd placed an order'! Regards, Andrew

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