Wow. I now remember watching that video before. That was part of the incentive to be able to do power tapping. Very impressive. But still scary.
Not sure how to peck tap. In playing though I did move away and then rerun on the same hole a few times. It didn't muck up the thread. Question which has to do with spindle speeds. I'm guessing that the Z follows the speed of the spindle so as long as it doesn't speed up or slow down in a non-trackable way that the PID on the spindle isn't super important. Like if I use the step/dir control and the motor is turning 1000 RPM and the spindle 1027 RPM that the threading will still behave exactly the same way. OTOH, adding the PID to the step/dir should theoretically control the step rate so that the system tracks the commanded velocity. But, and here's the question which should probably be on a different subject line: If I change pulleys so the spindle is now at 70% of motor speed what's the easiest way to tell the HAL file to use different constants? And honestly I haven't done any online searching to see if this has been answered. Because of belt length I can set a proximity switch to catch that the motor is in a different position from the other pulley combination so a gpio input could somehow select a set of constants. John > -----Original Message----- > From: Sam Sokolik [mailto:samco...@gmail.com] > Sent: July-07-21 5:02 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Power Tapping > > I just use whatever I have... Sometimes I peck tap when I am using a hand > tap. A good spiral tap or one the shoots the shavings out the end (don't > remember what they are called) > > Like this one.. > > (you catch the shavings coming out the bottom..) > > https://youtu.be/E2t0y2EsSO8?t=483 > > You get used to it after a while... :) > > > > On Wed, Jul 7, 2021 at 6:39 PM John Dammeyer <jo...@autoartisans.com> wrote: > > > It's an Amazon Prime product so shipping is free but yes, in Canadian $ > > half the price of the Swiss one and probably should be 1/4 the price since > > it's no name. > > > > Having said all that. With just a normal tap (I had to try) here is the > > result into MDF. > > > > Scary to watch it do this. I really should stop using G0 for positioning > > when I'm trying things out. Especially when I forget to touch off the new > > home position... > > > > But for metal a spiral, or at least spiral point is a must I think. Time > > to do a bit more tuning but impressed as how well it works. > > > > John > > > > > > > -----Original Message----- > > > From: andy pugh [mailto:bodge...@gmail.com] > > > Sent: July-07-21 4:06 PM > > > To: Enhanced Machine Controller (EMC) > > > Subject: Re: [Emc-users] Power Tapping > > > > > > On Wed, 7 Jul 2021 at 23:09, John Dammeyer <jo...@autoartisans.com> > > wrote: > > > > > > > > As I get closer to being able to try power tapping I'm wondering if > > this sort of tap is suitable? > > > > https://www.amazon.ca/gp/product/B00F8T55GC/ref=ox_sc_act_title_3 > > > > > > It looks expensive for a no-name tool. > > > > > > > > https://www.zoro.co.uk/shop/cutting-tools/hss-pm-production-taps/hss-orange-ring-taps%3A-spiral-flute-unc-nitride-and- > > > oxidised/f/940?query=1%2F4%2020 > > > > > > As a comparison. > > > > > > -- > > > 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 > > > > _______________________________________________ > 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
