gene are you drilling entrance holes? i noticed in your earlier comments that they are breaking on the plunge iirc. i would spin it as fast as it will turn climb only, either irrigate with a squirt bottle with water and glycerin to reduce surface tension and some air to remove chips. i would also drill entrance holes and try a .015 doc. would probably program 6 to 8 ipm and use feed override while single blocking in a sacrificial piece to get a feel. as to what YOU SHOULD do its kinda hard to say specifically as every machine has a different perfomance level tha mazaks i used to build f 16 parts on could probably whip one up in 45 seconds or so , the point is you know what your machines limits are better than i , i think though that the advice of what you shouldnt do, dont cut more than .032 depth of cut ( full dia full doc, is using all available rigidity in the tool thats why i recommended .015) also it is stressing the tool in both axis fully . you do not want to conventional mill this as you need not be eating hot chips . you may even want to do all roughing in with a drill in fact removal in z is the fastest approach to any rough milling operation as z is the stiffest axis . so what im saying is a series of g81 to remove the rough out material. then rough out the slot and take a finish pass at .001 radial doc . do not use a slow feed try for .001 chip load or less but increase feed if you see melting or plugging !!! ymmv and i cannot guarantee the life of your end mill but its how i would approach it . also use 4 flute end mills which at that dia i think thats all you can get.
heres a link to a chip load calculator http://robbjack.com/technical/formulas I have probably 20 different slide rules in my inventory ( i collect them ) but i use only one http://www.ebay.com/itm/Machinists-Speed-Feed-Calculator-CNC-Mill-Tooling-/230704129486?pt=LH_DefaultDomain_0&hash=item35b709a5ce now it wont help you with the acrylics and i doubt you need to know the feeds for titanium it is a great resource and worthy of this guys asking price . you can sometimes find them for around ten bucks this was the first one that popped up . sorry i did not return some thoughts earlier but i have been in bed fevering for 2 days and have not had the capacity to use any wet ram as you would call it . hope this helps gene and i hope you don't break that last end mill . take care and happy milling P.S. it is really great to see you plugging along and getting things done you inspire me and i sometimes show your posts to the wife. was in coolville ohio near memorial day and found myself on the Appalachian highway and in western west Virginia thinking i should have messaged you before we headed that way but we didn't realize that we would end up in west va . anyhow i have rambled on and im certain that my incorrect punctuation and grammar will keep you reading this boilerplate for at least 15 minutes to make heads or tails of it but i hope you enjoy lol ------------------------------------------------------------------------------ Open source business process management suite built on Java and Eclipse Turn processes into business applications with Bonita BPM Community Edition Quickly connect people, data, and systems into organized workflows Winner of BOSSIE, CODIE, OW2 and Gartner awards http://p.sf.net/sfu/Bonitasoft _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
