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More CNC Basics for Aluminum
Question
Would it be a good idea to run this diamond plate in two or more passes or just one? What should I use to spray the tool in order to avoid overheating? Does my feed/rpm sound right? 12,000-13,000 rpm/150-200 feed rate? Forum Responses
From the original questioner: Sorry for being vague... What I'm actually doing is a through cut logo (text). From contributor W: For 1/4" thick aluminum, I would suggest two rough passes and one finish pass. Always run the tool in the climb cutting direction, and coolant always helps. You will have to play with feed speeds to get the edge quality you need. Personally, I would use an upcut bit. From contributor R: Your tooling vendor should be able to tell you what feeds and speeds to use. Also, you will need to spray coolant on the tool while machining. Your tooling vendor should be able to give you some recommendations there as well. It would also be a good idea to talk with the folks at Komo. From contributor G: I would not use a down shear tool, as it will gum up. Use a straight or up shear tool, as you need the chips to come out of the cut. Both tools are for dry cutting. From contributor T: I hate to come in with a differing theory, but here goes. You should be using a solid carbide endmill for this application. Your depth of cut should not exceed one diameter of your cutting bit per pass. Endmills are always down cutting, as it helps to eliminate burs on the top surfaces. Aluminum diamond plate is one of the harder grades of aluminum. It is used a great deal on running boards and other tough applications. Based on this information, you can run this application at 12,000 RPM's and 76 inches per minute feed rate. This is a starting feed rate you can adjust up to increase production or down to improve finish quality. As for coolant, if you want non-messy options, try stick wax or a cold air gun. If mess isn't an issue, most metalworking coolants will work, but some are made for non-ferrous metals as they will not stain the part. Would you like to add information to this article? Interested in writing or submitting an article? Have a question about this article? Have you reviewed the related Knowledge Base areas below? 
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