On Saturday 24 September 2016 12:14:01 Jon Elson wrote: > On 09/24/2016 08:46 AM, Gene Heskett wrote: > > On Saturday 24 September 2016 04:35:23 Nicklas Karlsson wrote: > >> For aluminium I have vague memory there is a non optimal speed > >> there metal stick the most. Can't however if it was feed rate or > >> rotational speed of tool. > > > > Probably surface speed related. 6061 is fairly soft, but it wasn't > > sticking to the tool. Cutting looooong stringers, the tool shank > > looks like alu now. I started out at 800 revs & a 10 mm hole, but > > 800, half a mm cut at 100 mm's a minute feed was saying the motor is > > working a bit, so at 40 mm's I turned it down to 500. Ideal > > speed/feed? Idontknow. > > > > Cheers, Gene Heskett > > 800 RPM? Way too LOW! I run up to 1/2" cutters at 2720 RPM > (highest speed on my ancient Bridgeport). > Take shallow cuts and keep the feed as fast as you can. > > Jon > Lets see if my math, and a TI-30XIIS is working. 1/2" bit, circumference is pi*d= nominally 4300 SFM.
I'm spinning a 5" 4 jaw on a toy sized lathe, and the workpiece is 43mm's in diameter. 43/25.4 to get inches = 1.6929etc * pi *rpms, so its 3.63" per rev, and 800 revs is then 2900 SFM. So I should be turning at least 1200-1300 to dup that. Right? The question then is what the heck do I do with all that curly swarf? Making the pulley hub, and boring the pulley, (its all together and looks like it will work, well aligned now) made at least a bushel of gnarly swarf I carried to the bin in sometimes soccer ball gobs. And the lathe is still a mess. I'll have to sweep before its clean enough not to clog up the vacuum. Interesting swarf story to tell this morning. The wire joints for the x motor, located where the wire comes out of the cable/chain, so its basically on top of the motor, and the cable is connected to the motor wires with little grey wire nuts. A lot of the swarf went off the back of the toolbox, crossing the area where those nuts are sticking up. Your are guessing by now where this is going. At one point it must have shorted, and about 4" of that swarf lit up white hot and exploded like a fuse, nice attention getting pop. The 2M542 driver protected itself well, the motor never missed a step! I either need to put that in a small box, or at least fill the back of the nuts with Go-2. 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> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
