On Sunday 06 July 2014 21:07:35 jeremy youngs did opine And Gene did reply: > 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 say​ing 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-Tooli > ng-/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 .
This stuff is lexan, 250x stronger than the acryilcs in the same thickness. They claim that when used for window glass. it will stop a 22LR bullet by throwing it back at the shooter. From previous experience, I know a drill bit has to be fresh sharp from an original drill doctor. Anything else walks off worse than if it was SS. > 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 . Sounds like you are better now, and thats good. > hope > this helps gene and i hope you don't break that last end mill . MSC has more, and these are 2 fluters. > 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 Must have been on I-77 then, I-79 which goes by here is more of a centralized road, connecting Pittsburgh to Charleston. > 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 Nah, twice thru and I got it all :) Thanks Jeremy. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ 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
