Nothing to do with the value of the slug, I doubt I would keep it. Machining time and cutter wear. 3.75" is a lot to reduce to chips, just running a profile path is fine, nothing to be scared of.
On Wed, 1 Mar 2023 at 03:01, <ken.stra...@gmail.com> wrote: > What is the value of a possibly damaged 20mm carbide endmill versus the > value of a 2.5 inch diameter 1.75 inch long plug of aluminum? > > -----Original Message----- > From: Robin Szemeti via Emc-users <emc-users@lists.sourceforge.net> > Sent: February 28, 2023 8:51 PM > To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> > Cc: Robin Szemeti <ro...@redpoint.org.uk> > Subject: Re: [Emc-users] Milling Strategies? > > 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 > > > > _______________________________________________ > 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
