Spot drills are also available in carbide which is much stiffer than a HSS spot drill. For best accuracy, the tip angle of the spot drill should be greater than the angle of your drill. That is, for a 118-degree drill a spot drill of 120 degrees or more is best.
-----Original Message----- From: Nicklas SB Karlsson <n...@nksb.eu> Sent: October 20, 2022 2:11 PM To: emc-users@lists.sourceforge.net Subject: Re: [Emc-users] Freecad path workbench + drilling small hole Center drill is 60 degree angle. It have thick shaft which is good but thinner tip. Spot drill is 90 degree angle and have found statements it is made fo precise bore hole placement so muste be a good choice. Will try the spot drill to make a dent, probably 8mm to get a stiff shaft. Or maybe drill the hole with the spot drill as material is rather thin. Nicklas Karlsson tor 2022-10-20 klockan 13:11 -0400 skrev Matthew Herd: > Or (preferably) use a spot drill, which is even more robust. They > typically have a 90 degree point angle and are very rigid. > > > On Oct 20, 2022, at 12:59 PM, Thomas J Powderly <tjt...@gmail.com> > > wrote: > > > > Hi Nicklas > > > > always center drill first > > > > tomp > > > > On 10/20/22 9:23 PM, Nicklas SB Karlsson wrote: > > > There is some things missing in the Freecad path workbench of > > > which some are rather simple to fix. Zig facing operation, rigid > > > tapping, G95 feed per revolution or tooth is not possible and > > > these are probably not to hard to fix. While reorder and get blank > > > from machining of previous operation might be harder. > > > > > > Have been able to figure a little bit on the data model add a zig > > > function but had to disable some kind of sorting function > > > sometimes changing direction of cut, probably to get shortest > > > path. > > > > > > Have registered to Freecad mailing lists and posted on at least > > > one of them but they seems dead. Anybody else activing in Freecad? > > > > > > > > > Just starting to machine my first parts milling seems to work > > > rather well. Drilling small holes a few millimeters I am however a > > > little bit uncertain it work well to start a hole with a normal > > > length drill? Or start point tend to slip a little bit on the > > > surface? > > > > > > > > > Nicklas Karlsson > > > > > > > > > > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > <ctrdrill.png>_______________________________________________ > > 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
