On Wednesday 27 July 2016 08:33:02 Todd Zuercher wrote: > We laser a lot of paper, and more than a few sheets at a time is a > problem. The main problem is focal length when trying to cut > something thick, at least with our machines and lenses.
The std CO2 for burning/welding needs lenses? I had been under the impression its beam width was tight and colinear. Subject of course to attenuation and defocussing by the smoke products. > Plus all the > smoke residue that gets all over every thing. Yeah, that too, as even flooded with GN2, there's going to be some vapors generated. I've of course never done it, but would not mind it if I had the gear to do it, just to see what the problems might be. Another thought might be a drag knife similar to the ones Roland uses to make stencils for big signs in the graphics houses. But that would be a 2 or 3 sheet at a time maximum cut, and likely several worn dull knives by the time you had finished one novel sized book. Paper is many times harder on such a knife compared to the plastic sheeting Mike feeds his 72" wide Roland with. Hollowing out a 250 page book on pulp paper would take a pause to remove the cuttings as loosened unless a vacuum arm could swing in and remove the cutting. Thats too time consuming and labor intensive to be a viable method. If a suitably sized Heidleburg press was available, and the book has not yet been bound, there are frames that can hold impact cutting blades for it, or were 65 years ago, that could cut the pattern for a business envelop out at around 2 sheets a second. But thats a print shop job. ISTR seeing a Harris press do that too back in the sands of time. And its a lot less dangerous to be around as the paper handling arms on the Heidelburg can kill. > ----- Original Message ----- > From: "Gene Heskett" <[email protected]> > To: [email protected] > Sent: Wednesday, July 27, 2016 2:12:39 AM > Subject: Re: [Emc-users] O.T.: Machining paper stack > > On Wednesday 27 July 2016 00:59:27 Gregg Eshelman wrote: > > Water jet. I'm serious. Google water jet cutting paper > > I think I'd be more inclined to try the same laser that does the wood > carving, with the work area sealed off & flooded with dry nitrogen. > No oxygen, no fire. And I'd expect a sharper cut. It wouldn't be as > fast as the water jet if the OP has a boat load of them to do though. > Otoh, whats cut out might be salvageable for another project in the > print shop. I would not allow air back into the cut for at least 30 > seconds after the laser has fired the last time as the edges may > remain hot enough to self-ignite when oxygen is allowed back into the > work box. > > I assume the target is hollow books for valuables storage in plain > sight? > > Cheers, Gene Heskett 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> ------------------------------------------------------------------------------ What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports.http://sdm.link/zohodev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
