yeah, the faster it goes, the more I am impressed from Acorn/CNC12.
No delays for calculation and smooth acceleration/decelaration like a not to old 200000$ machine.
It needs a fast machine to realy show off Centroids potential in DIY motion control.
Now I am teased to build a fast router for aluminium milling with 30000mm/min rapids
Uwe
Re: New Build, PM2700 lathe with Acorn, Videos and Photos <upgraded to AC servos>
Posted: Fri Apr 15, 2022 9:21 am
by suntravel
Rigid Tapping works as well...
Uwe
Re: New Build, PM2700 lathe with Acorn, Videos and Photos <upgraded to AC servos>
Posted: Fri Apr 15, 2022 12:11 pm
by Black Forest
Do you have an uncle named Einstein?
Re: New Build, PM2700 lathe with Acorn, Videos and Photos <upgraded to AC servos>
Posted: Fri Apr 15, 2022 1:31 pm
by cnckeith
nice! another fun thing to do is to retap the same hole, (don't forget to remove the set screw!:-)
Re: New Build, PM2700 lathe with Acorn, Videos and Photos <upgraded to AC servos>
Posted: Fri Apr 22, 2022 5:24 pm
by BillB
Nice! how much do you have invested in the machine and control all in?
Re: New Build, PM2700 lathe with Acorn
Posted: Fri Apr 22, 2022 5:38 pm
by BillB
suntravel wrote: ↑Thu Mar 31, 2022 3:30 pm
Today I set up an automatic tool measuring with a modified 3D probe. Way faster than skim cuts, under 30s per tool and ready to go
Uwe
Where did you get the tool probe? I hate the skim cut method.
I set up a circuit that turns on a light bulb when the tool makes contact with the stock on my lathe for setting tools to make it a little easier. Basically just a continuity tester. Not sure how repeatable it will be but seems to work in testing, I have not used it in practicality yet.
Can you provide a link to this probe?
Re: New Build, PM2700 lathe with Acorn, Videos and Photos <upgraded to AC servos>
Posted: Fri Apr 22, 2022 6:00 pm
by BillB
Is the red thing above the chuck a mist extraction vent? In a couple of the vids It looks like its pulling the mist up into it? ?
This build is impressive, very nice work.
Re: New Build, PM2700 lathe with Acorn
Posted: Fri Apr 22, 2022 6:03 pm
by tblough
BillB wrote: ↑Fri Apr 22, 2022 5:38 pm
Where did you get the tool probe? I hate the skim cut method...
The probe will get you close, but it doesn't account for tool push off, part deflection, and slop in the machine ways. If you are shooting for a couple of thousandths or less, you'll still end up making a skim cut at some point and adjusting your offset values.
Re: New Build, PM2700 lathe with Acorn, Videos and Photos <upgraded to AC servos>
Posted: Sat Apr 23, 2022 1:17 am
by suntravel
The Probe is a cheap chinese 3D probe with NPN circuit and a tip I made for the lathe.
Tom is right, for some cases you will have to adjust after probing if the part and the machine are not very rigid.
But a shallow skim cut will also not be the best solution. I prefer, if i make a 0.4mm depth of cut for finish pass, to dial in +0.4mm run the part, measure and then correct the offset ( for long parts correct a possible taper in the program ), run the finish pass again and be spot on. This ensures all deflection which occurs for these cutting parameters are taken in to account.
Uwe
Re: New Build, PM2700 lathe with Acorn, Videos and Photos <upgraded to AC servos>
Posted: Sat Apr 23, 2022 3:26 am
by BillB
suntravel wrote: ↑Sat Apr 23, 2022 1:17 am
The Probe is a cheap chinese 3D probe with NPN circuit and a tip I made for the lathe.
Tom is right, for some cases you will have to adjust after probing if the part and the machine are not very rigid.
But a shallow skim cut will also not be the best solution. I prefer, if i make a 0.4mm depth of cut for finish pass, to dial in +0.4mm run the part, measure and then correct the offset ( for long parts correct a possible taper in the program ), run the finish pass again and be spot on. This ensures all deflection which occurs for these cutting parameters are taken in to account.
