On Wednesday 11 November 2009, David Braley wrote: >Gene Heskett wrote: >> Greetings; >> >> One of the things I have not yet learned is how to get the most swarf >> from a given milling tool. I have a tendency to go slow, so the swarf is >> sometimes so thin it settles like snow flakes when it is blown away from >> the work. >> >> Obviously this is wasting the cutting edge of the tool, dulling it >> prematurely. >> >> So when my fresh shipment of 1/8" mills gets here, I would like to be >> able to have it throw thicker chips and far fewer of them but remove lots >> more metal before they dull. >> >> I'm going to rig me an oil squirter from an in tank auto fuel pump to try >> and keep the mill wet. With a tuna can under the workpiece I can catch >> most of the runoff, and maybe even filter & recycle it. Details to be >> invented yet in the finest of shade tree mechanic methods of course. ;) >> >> Assuming I keep the area wet with cutting oil at a high enough flow that >> I don't wind up with a muddy slurry, but do have enough chips to act as a >> wick and keep the mill wet from the cutting oil they absorb (or the oil >> level in the tuna can is high enough), and the 1/8" 2 flute carbide upcut >> spiral mill is turning 2500 rpms, how fast can I feed it while doing a >> 0.020" deep cut per pass without breaking it? Slower and deeper, or >> shallower and faster for best tool life? > >Feeds and speeds as you already know is a delicate dance with what >material you're machining, spindle speed, number of flutes on your >milling cutter, table speeds and lubrication. And like you discovered >above, it's better to cut than rub your material off. > >It sounds like you are running a smaller machine. If that's the case, >another factor comes into the equation and that's how stable or rigid >your spindle is. A spindle that is built with bearings less than ABEC >7's is not going to give you the rigidity you will need for long tool >life. Your small spindle my wind way up, but that'll be useless when you >start to load it with heavier cutting. Procession is not your friend. >Even if it's so small, you can hardly detect it. > >I like your oil squirter idea for lubricating your cutter, but I want >you to consider instead using a spray mister. The reason is simply >because once you start to make bigger chips with those tiny cutters, >you're going to have a problem with getting them out of the way. The >smaller cutters are more commonly broken because the chips clog up the >works. A spray mister will by its nature, blow everything out of the >slot you're cutting, keeping the system cool, lubed and clean. It's less >of an issue with larger cutters. The mister does make more of a mess, >but with simple and carefully placed shielding, you can contain most of >it. You will also be surprised at how little mist coolant you'll end up >using when you get it adjusted right. > >My worthless two cents. ;-) > >David > That thought has crossed my mind too, by using something along the lines of an air brush that siphons & setting it for a very low flow. Air pressure I have, there is a 2hp 120 psi compressor only 4 feet away, and I'd already rigged a nozzle to sweep the cuttings away, so it would be a matter of figuring out how to aim the airbrush and lock it on. Them aren't bendable for aim like the nozzle I have rigged now. And Badger sure as hell doesn't give them away, so I'm open for suggestions for a cheaper by 20x substitute. Old fly sprayers come to mind if the oil feed could be throttled. I'm thinking, can't you see the smoke? :)
Thanks David, & you too Jon as I forget to do that in my previous post. >--------------------------------------------------------------------------- >--- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 > 30-Day trial. Simplify your report design, integration and deployment - > and focus on what you do best, core application coding. Discover what's > new with Crystal Reports now. http://p.sf.net/sfu/bobj-july >_______________________________________________ >Emc-users mailing list >Emc-users@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/emc-users > -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) The NRA is offering FREE Associate memberships to anyone who wants them. <https://www.nrahq.org/nrabonus/accept-membership.asp> If you can't understand it, it is intuitively obvious. ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
