On Monday 09 May 2016 22:41:30 Jon Elson wrote: > On 05/09/2016 09:08 PM, Gene Heskett wrote: > > So I guess my assumptions are fairly correct, eg turn it slow enough > > not to spew sparks, and don't force it. The latter I am doing but > > at very low rates of feed, and motions that limit the rims contact > > with a wide area of the casting. The only thing I found was a > > recommendation that when running dry, it be given a cooling rest to > > keep it from over heating and ablating the diamond away. The cut it > > is currently doing is about 5/8ths done, and the block was up to > > about 110F while the rim of the saw was around 120F when as its > > late, I paused it and turned off the spindle after it had spun free > > at the end of the current pass. Tommorrow it will be back to room > > temp, low 70's F, and I don't think I should add any cooling pauses, > > given the minimal rise in temps I am seeing with my IR thermometer > > now, unless you folks think I should. So sound off if you disagree. > > Geez, why are you using a diamond blade on cast iron? Do > you need an insanely narrow kerf for some reason? That's > about the only reason I can imagine to do this. Otherwise, > an HSS slitting saw sounds like a much better way to go. > (Maybe, if you can get one, an M42 or M57 saw blade would be > better, as CI is pretty abrasive.) > The cut in this case, is a bit north of 4" deep, hence the 10" blade. And I am using what I can src locally. The average turning force is less and far more even a load than a single tooth PCD blade at 3x the cost of a $45 continuous edge tile blade, and I'd be waiting a week on the PCD blade.
> I cut aluminum all the time with HSS slitting saws. CI is > not all that much harder to cut, but it will wear the saw > faster. I use flood coolant, slowed down to a dribble and > am still on my first saw blades after quite a lot of > slitting operations. > > I've never heard of running diamond saws dry! Seems like > you need coolant or something just to keep the cut from > filling with swarf and jamming. > > Jon > I believe I have heard it do that now and then, but not since I added a long y stroke across the cut after each x increment. That, coupled with a backtrace .05mm z offset from the fwd y move, seems to have tamed that. I haven't seen the motor amps above 3.2 in quite a while. Cutting air at that 400 revs speed is about 2.0 amps. Low gear of course. 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> ------------------------------------------------------------------------------ Mobile security can be enabling, not merely restricting. Employees who bring their own devices (BYOD) to work are irked by the imposition of MDM restrictions. Mobile Device Manager Plus allows you to control only the apps on BYO-devices by containerizing them, leaving personal data untouched! https://ad.doubleclick.net/ddm/clk/304595813;131938128;j _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
