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| Rule of Thumb. |
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| Mjay:
Now does that speed rule of thumb used for hss , carbide or both? I enjoyed the pics :beer: |
| Stilldrillin:
--- Quote from: Mjay on January 16, 2009, 12:04:26 AM ---Now does that speed rule of thumb used for hss , carbide or both? I enjoyed the pics :beer: --- End quote --- Thanks Stew, & Mjay! The rule of thumb is for HSS drills, cutting quality engineering steels. Faster, or slower to suit conditions...... Carbide drills, up to 25mm., I ran approx twice those rpm. Carbide cutters...... I ran 50mm. at 900 - 1,000rpm. Pro rata for other sizes........ I`ve just remembered. :scratch: That second rock bit, with the inserts....... We were supplying a driller who was contracted to drill 4,000 holes...... In Hong Kong. Wondered if he was trying to sink the island....... |
| HS93:
How about a RPM for drills & milling cutters, machining brass alloy, I know i woul appreatiate one . Peter |
| bogstandard:
Peter, I don't want to step on Dave's toes, but I think you are asking 'how long is a piece of string' with that one, and almost no-one could keep that much info brainstored, as there are too many variables. So here is a quickie link that gives a short explanation of a few of the variables and answers most of your question. http://maelabs.ucsd.edu/mae_ms/feeds_speeds.html But if you want to do a bit more research on it, type in 'machine feeds and speeds' into your favourite search engine. In fact over the years, I have seen a lot of charts that can be downloaded or screengrabbed, then just get them printed up and laminated and keep them handy in your shop. A lot of it is really down to experience plus a bit of trial and error. Hope this helps. John |
| Stilldrillin:
Spot on, John! :clap: Thank you :thumbup: |
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