Our router has a thick MDF spoil-board that material gets wood-screwed down to. We had an old machine that had T-slots but they were never in the right position or we never had enough hold-down clamps.
Our members/users are taught to either use enough screws so that warped material is held flat before, during, and after cutting or to use material that isn't warped. For holding tabs, we simply use a flush-cut router bit on a manual router table to clean them up very quickly with just as good of surface finish as the CNC left. To prevent the tabs breaking and tearing the parts while removing the parts and skeleton from the table, we simply use a sharp wood chisel to cut the tabs while still on the table. Then the parts can be removed separately and without damage. On Mon, Jun 27, 2016 at 12:33 PM, <dan...@austin.rr.com> wrote: > I've worked with a number of CNC router users on a bunch of jobs. I had > to change my beliefs along the way, based on experience. > > Tabs are often a huge liability. They are a lot of work to cut, leave a > finish problem where they were cut off, and sometimes tear out the work > when you move the sheet off the router. Wood is often warped and the tabs > may not render at all anyhow. With some bits and materials, you just don't > need tabs, the cut piece stays in place. > > Many skilled users don't do them. Popped pieces can sometimes happen, but > they can happen WITH tabs too if the sheet lifts and breaks them. So > there's no "tabs are the only proper way" rule to it. There will always be > a need to pause the machine, fix something which involves a move, and > resume. > > I'll work on this "moveoff" component then. > > Danny > > ---- andy pugh <bodge...@gmail.com> wrote: > > On 27 June 2016 at 15:28, Chris Kelley <tensait...@gmail.com> wrote: > > I would say that the "proper answer" is to teach the users to properly > use > > holding-tabs, hold-downs, etc > > That reminds me, I used holding tabs a lot in CamBam, but haven't even > found them in Fusion360 or Inventor HSM. I wonder if they are there to > be found? > > However, to say that it is possible to never need to stop a job > part-way through to fix something is, I think, going a bit far. As I > recall the moveoff component was written after a request from a > commercial roll-machining company who wanted to be able to change > chipped or worn tips mid-job. > > -- > atp > "A motorcycle is a bicycle with a pandemonium attachment and is > designed for the especial use of mechanical geniuses, daredevils and > lunatics." > — George Fitch, Atlanta Constitution Newspaper, 1916 > > > ------------------------------------------------------------------------------ > Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San > Francisco, CA to explore cutting-edge tech and listen to tech luminaries > present their vision of the future. This family event has something for > everyone, including kids. Get more information and register today. > http://sdm.link/attshape > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > ------------------------------------------------------------------------------ > Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San > Francisco, CA to explore cutting-edge tech and listen to tech luminaries > present their vision of the future. This family event has something for > everyone, including kids. Get more information and register today. > http://sdm.link/attshape > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San Francisco, CA to explore cutting-edge tech and listen to tech luminaries present their vision of the future. This family event has something for everyone, including kids. Get more information and register today. http://sdm.link/attshape _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
