Advanced Search

Hello all

I installed a 0-10v signal from my MESA 7i77 board to the vfd to control rpm and my XHC-W04B-6 pendant will enable the spindle but wont tell the spindle to turn at default spindle speed set in the ini file .  Any help would be appreciated.

Regards 
James 

Hello,
I already have a Maho MH500 and a cycloidal lathe retrofitted to LinuxCNC, so I do have some practical experience with LinuxCNC retrofits.Now a colleague has approached me with the following idea:
He wants to build a CNC rotary table for his Maho MH600 in order to hob gears (gear hobbing).The idea is a rotary table with an “electronic gearbox”, synchronized to the machine spindle of the Maho.Key requirements:

• Maximum rotary table speed: ~300 rpm
• Servo or stepper drive with a gearbox, approx. 1:3
• The control should run fully standalone
• Only spindle position and spindle speed are taken from the spindle encoder
• The rotary table is synchronized to the spindle via electronic gearing

Questions / design considerations:

• What is the best choice of encoder for this application?
  Probably an absolute encoder? or better incremental for a better dynamic?
• Servo motor will most likely be NEMA 42 size
• Encoder setup ideas:
  • Incremental encoder on the spindle
  • Encoder directly on the rotary table
  • Possibly an additional encoder on the motor
• How should the control and feedback loops be structured for this setup?

I would appreciate any recommendations regarding:

• encoder types and placement
• control loop architecture
• practical LinuxCNC / Mesa hardware solutions for this kind of standalone rotary table

Perfect, thanks!!

Thanks for your replies.
in my case delta etheecat asda a3e give me resolution om the motor at output on ethercat. In asda soft avaible option mul/div parameters for recalculation encodee output, but every reboot servodrive thats parameters became to 1. So i calculated (all mechanical reduction and motors encoder resolution) scale-pos, it about 9 500 000 to receive correct move command execution. 

Of cpurse, maybe right way is to put parameters asda delta div/mul to scaledown , but may be there are some other way?

Not yet officially. Maybe by feb. Machine should launch late jan.

@ ihavenofish
Did you already put the bounty up for the jerk control?

The lspci report indicates the the board is accessible (as a 5I25)

Make sure that you leave the 6I25 jumpered for 5I25 mode or you will have access issues.

@ abs32

can you share a screenshot after running on your system

latency-histogram

for a few minutes with a few glxgears running?

From your lspciThat is the 5i25.

I have similar problem; tried 2 PCs. On both 6i25 is disabled in UEFI and enabled in legacy mode. Tried switching between 5i25 and 6i25 modes.
But mesaflash reports that no boards are found.
Attached output of dmesg and lspci commands.
I am using latest Debian version from LinuxCNC website.

Hi niiice christmas light From the person that wrote on your youtube page

Sorry, I tried uploading pictures of my BOB several times, but it wouldn't do it. I think I got it to work finally.

NWE, even though I have the BOB right next to the contactor and 12v/24v power supplies, I have never had any issues from those. I have consistently been able to run programs without issue with everything except the VFD on. The contactor is part of my Estop circuit, and it only gets turned on before I run a program or off if I hit the Estop. I have only ever experienced issues when the VFD is on.

I experimented yesterday and learned some. I tried connecting it to earth ground, but that did nothing. I tried disconnecting everything from the BOB except for the 24v coming in and the parallel port and USB from the PC (I switched the VFD to manual control). LinuxCNC ran the program with out any trips even though the VFD was running, so the BOB itself can't be the issue. I tried reconnecting one of the stepper driver pulse/direction signal wires (the steppers were completely off) and ran the program again, and it did trip, even though that wire is shielded and grounded.

I will disconnect the second shielding grounding at the motor. I will also try adding ferrites on the VFD wires first. I think we have a couple lying around that we also pulled from other things.

i am here just for subscribe and learn something more about PLL ... 

take a look at default resolution SDO .. it has to be something like 20 or 16 ... it is user resolution per revolution ... maybe it has some weird setup from factory ... you have maybe swapped bytes or something or wrong data type .... 

you dont share anything ... maybe share more details for focused reply 

Never seen a several km long axis so I am out of clues, sorry.