To throw in my two cents; I build a lot of prototypes, and get my parts laser cut, but a CNC turret punch would be a great have.
I've toyed with the idea a lot and came up with this strategy; - machine designed to up to 3mm sheet metal only, maybe half a full sheet (1.2 x 1.2m) - build a high speed nibbler rather than a turret punch - the machine has two fixed tools, a 2x2 square punch, and a 2mm round punch - high speed nibbling will allow almost any profile to be generated with these two tools - the machine would be a fixed gantry style, 2.4m wide, and the gantry beam is simply loaded up with extra mass to prevent oscillations The mechanism would be hydraulically driven, with the pumps on the floor, and tubing up to the two cylinders The 'pump' is an eccentric piston, and free runs all the time, pushing and pulling oil into the tank. The volume is low When a punch operation is required, a pin will shoot into the oil line, redirecting the flow to one of the cylinders The pin will stay in position if continuous nibbling is required, or can be timed at intervals according to the sheet position (yes, you don't want to side load the tool too much) While the explanation is laborious, I think it's a simple setup to make.. Roland On Tue, 2 Feb 2021 at 12:55, andy pugh <bodge...@gmail.com> wrote: > On Mon, 1 Feb 2021 at 21:49, John Dammeyer <jo...@autoartisans.com> wrote: > > > Anyway the plan was to at some time create an ELS controlled movable > back fence for the 3:1 tool and an XY movement system for the Arbor press > to give me limited punching capabilities like the attached picture. > > I have thought that this would be a good thing to have if I ever get > round to making a CNC slotting head for my milling machine (Or if I > find an OEM one for the mill at a reasonable price[1]) > > Have you seen the Trumpf CNC punches? Fascinating machines: > https://youtu.be/-xOR42xho9I > > I think that one limitation of such a device would be throat depth. > The Trumpf machines have a huge one. > > There is probably value in mounting a linear rail to the bench in > front of the arbor press and then mounting a couple of switchable > magnets to the sliders just to manually move sheets in straight lines. > (would probably work with think aluminium with a steel bar on top) > > Which reminds me of another fascinating sheet metal tool. > https://youtu.be/OipSiPSRti8 > The inventor has, rather generously, written a web page on how to make > your own. > http://aaybee.com.au/Magnabend/Building%20Your%20Own%20Magnabend.html > I have had a small amount of success improvising a similar arrangement > with my mag-base drill. > > [1] Quite a fluid concept. The last time one came up it was £300 and > far too expensive. If I saw one now at that price I would snap it up) > -- > 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, 1912 > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
