A 20mm cutter will be fine, with a 16mm to remove the final bit of skin and be safely away from the plug, leaving some tabs.
On Wed, 1 Mar 2023 at 01:36, <ken.stra...@gmail.com> wrote: > A few comments/questions: > Is this a one-off job? If so your time is more valuable than the possible > recovery of a usable scrap of aluminum. Besides, do you have a use for a > 1.75x3 chunk of aluminum? > > The stock is 1.75 thick. That means an endmill with a stickout of 2 inches > or more. A small endmill cannot be used. Chip evacuation will be an issue > if slotting. Having a jam damages a large endmill is expensive! I > definitely would not trust masking tape + super glue to secure against the > cutting forces. > > Everything considered, turning the plug into chips seems the best approach > from here. > > > -----Original Message----- > From: Greg Bernard <marzetti...@gmail.com> > Sent: February 28, 2023 6:57 PM > To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Milling Strategies? > > It seems like a slotting tool path would be the way to go. Tabs to hold > the center in place has been suggested but it could be accomplished also > with the masking tape and super glue method: > https://www.youtube.com/watch?v=e-coDYZCmEw > > > On Tue, Feb 28, 2023 at 4:26 PM Robin Szemeti via Emc-users < > emc-users@lists.sourceforge.net> wrote: > > > I'd mill it down do within 1 or 2 mm of the bottom of the material and > > then swap to a smaller cutter to remove just the outer of the thinner > > material and leave 3 supporting tabs. Remove the centre piece by hand > > and then do a single full depth cleanup pass. > > > > I do this a lot when routing sheet MDF > > > > On Tue, 28 Feb 2023 at 21:46, Matthew Herd <herd.m...@gmail.com> wrote: > > > > > You could use a slotting strategy and tabs (at the bottom) to retain > > > the piece if you wanted to save the material. Then cut the tabs out > by hand. > > > Optionally do another finish pass after manual removal if the wall > > surface > > > matters. But I’d probably just use an adaptive strategy to turn it > > > into chips. Easier and probably faster. As long as you can clear > > > the chips without standing there with an air gun or vacuum. > > > > > > > > > > On Feb 28, 2023, at 3:53 PM, Todd Zuercher <to...@pgrahamdunn.com> > > > wrote: > > > > > > > > I need to mill about a 3.75" hole through a piece of aluminum > > > > about > > > 1.75" thick. What is the best strategy to accomplish this on a cnc > mill. > > > Is it best to us a pocketing strategy and mill out the entire hole > > > from > > the > > > center out, or would it be better to use some kind of cutting > > > strategy > > and > > > mill some size slug out of the middle? I can see the first option > > > being simpler, but the 2nd option saves a potentially useful piece > > > of material, but with the added complication of how to hold and > > > prevent the chunk of scrap from wreaking havoc when cut free. > > > > > > > > Todd Zuercher > > > > P. Graham Dunn Inc.<http://www.pgrahamdunn.com/index.php> > > > > 630 Henry Street > > > > Dalton, Ohio 44618 > > > > Phone: (330)828-2105ext. 2031 > > > > > > > > > > > > _______________________________________________ > > > > 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 > > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > -- > "Anyone who believes exponential growth can go on forever in a finite > world is either a madman or an economist." > -Kenneth Boulding, economist > Corporations are NOT people and money is NOT speech! > > _______________________________________________ > 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 > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
