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  • Sekai
  • Sekai
19 Jun 2025 03:07
Replied by Sekai on topic LinuxCNC MillTurn

LinuxCNC MillTurn

Category: General LinuxCNC Questions

Thx for the reply.
I know that linuxcnc has 9 axis in total and the name in different.
For now i have the linear guide rails and i'm working in Solidworks to build the 3d model of the entire build.
What i dont know is how to use linuxcnc for the spindle configuration.For example should i use a servomotor for the spindle head, main and subspindle or use a different style like a regular 3 phase motor with a VFD comanded by RS485 and then when i need position i can switch to servomotor or a stepper motor.
The advantage will be with 3 phase motor i can get higher rpm.
  • Sekai
  • Sekai
18 Jun 2025 19:26
LinuxCNC MillTurn was created by Sekai

LinuxCNC MillTurn

Category: General LinuxCNC Questions

Hi everybody.
I would like to build a CNC machine with 5 axis MillTurning.
Its basically like the DMG Mori CTX BETA 800 TC.
I work everyday as a cnc programmer with DMG(Siemens/Celo) and Doosan(Fanuc).
It would be a small form factor and only for light materials, like aluminiu or brass.
My ideea is :
X, Y, Z as linear axis.
C1, C2, C3 as rotary axis.
C1 is the rotary axis of the spindle head
C2 is rotary axis of main spindle (G54)
C3 is the subspindle (G55 for ex.)
BTW i know that in DMG the C1, C2, C3 are in angular mode, in turn mode is S1, S2, S3.
The Spindle head will be with a BT30. (i will machine all turn base tool holders for BT30)
The driver part i would like to use 400W to 750 W servomotors.
I would like to use Parallel port for this setup but i get the feeling i'm limiting the performance of the build.
For the moment i have some stepper motors (JSS57P2N) would like to experiment.
The build size will be maximum of 500mm between arbors (S2, S3), the Y axis max 150 mm travel, X axis 200 mm travel.
The problem i face right now is it posibil to make this cnc with linxcnc or i have to buy a different controller and software?
For now i have DELL Optiplex 745 with Intel Core2Duo CPU and 4GB Ram, AMD video card and i get about 12000ns
 latency test.
I'm trying different configurations but do not see something compatible for my purpose.
If someone build something similar from DMG style could you guide me.
Thanks
 
  • russkinch
  • russkinch's Avatar
09 Jun 2025 22:12
Encoder for rigid tapping was created by russkinch

Encoder for rigid tapping

Category: HAL

Hi,
I have a 50p/r encoder with A, B & Z. It threads perfect and can thread at 1000rpm no hassles. I am trying to do rigid tapping, but when I use G33.1, it taps to the right depth, but when the chuck reverses, the tap goes in more and not out. Its like the stepper is not being told to reverse direction. 
In my HAL file I have the three inputs setup (net spindle-phase-a encoder.0-phase-A) etc, I have the scale set to 50 and encoder mode set to 1. When I turn the chuck by hand, the position in HAL view rises by 1 for every 1 revolution of the chuck, but if I turn the chuck in the opposite direction, it carries on increasing and not count down. Is this correct? My encoder is an incremental Omron E6B2-CWZ6C. I am using a prallel port BOB (blue). Nema32 stepper motors and can control my spindle speed via the VFD (Bosch)

Any help is greatly appreciated.
  • atrex77
  • atrex77's Avatar
31 May 2025 11:52 - 31 May 2025 12:00

W5100S-EVB-PICO stepgenerator and encoder driver

Category: Driver Boards

in the near future. The stepper-ninja hal driver run in the servo-thread so the minimum width of one input is 1 servo thread refresh in length, with 1KHz servo-thread its 1mS, something like this: when you see a ruler, all 1mm division represents a servo thread cycle, the signal only starts in the divisions and only end on the divisions. With low spindle speed its probably working, but if you want better threading you use printer port for the lathe spindle encoder.
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