Centroid Community CNC Support Forum

martyscncgarage wrote: ↑Sun Jan 12, 2020 5:27 pm

frijoli wrote: ↑Sun Jan 12, 2020 2:16 pm The factory home switch on the Southbend is in the middle of the Z travel. Is there an easy way to use this to home, and then move away in the + direction for inches and then set machine zero?
The X axis is normal.

Though I have never tried it, because....I would put the switch in the proper location.

Marty

I plan on adding/moving the switch, but I also plan on using the machine first! lol
I am not sure why the put the switch there. It's mounted through the casting of the bed.

Wiring is about 80%
Old stepper controller Gutted and adding new Acorn

Quick update.
Pay attention to what is going on around you. I'll get to that in a second.

The Joki magnetic encoders work with the CNC4PC differential adapter boards(C72). Meaning I threaded parts, tapped holes and constant surface speed works with the spindle! The spindle readout in CNC12 is dead on what my test tachometer reads.
My stepper drive works for my axis ATC, although not mounted yet, nor complete. The the pulse works as well from the encoder for homing. It's the same Joki encoder with pulse out and NO differential adapter. Just connected like a proximity switch. Pay attention! I was testing input and output responses with the encoder and I dropped a jumper wire. It landed directly accross the right terminals to kill my C86 board(CNC4PC). It still works "IF" I disconnect the fault/enable input to Acorn. Ordered another board and I am off to California for work.
I painted some of the components and started the reconstruction.I'll try and get some pictures tomorrow. This machine should be complete in about 3 weeks! Gotta find a small "paying" lathe job to run on it.

frijoli wrote: ↑Sat Feb 01, 2020 11:31 pm Quick update.
Pay attention to what is going on around you. I'll get to that in a second.

The Joki magnetic encoders work with the CNC4PC differential adapter boards(C72). Meaning I threaded parts, tapped holes and constant surface speed works with the spindle! The spindle readout in CNC12 is dead on what my test tachometer reads.
My stepper drive works for my axis ATC, although not mounted yet, nor complete. The the pulse works as well from the encoder for homing. It's the same Joki encoder with pulse out and NO differential adapter. Just connected like a proximity switch.
NEMA23 Stepper.JPGCheap Ass Stepper driver.JPG
Pay attention! I was testing input and output responses with the encoder and I dropped a jumper wire. It landed directly accross the right terminals to kill my C86 board(CNC4PC). It still works "IF" I disconnect the fault/enable input to Acorn. Ordered another board and I am off to California for work.
I painted some of the components and started the reconstruction.I'll try and get some pictures tomorrow. This machine should be complete in about 3 weeks! Gotta find a small "paying" lathe job to run on it.

Yup, happened to me too once Clay!
You'll get there. Now that you know machine is running around ok, clean up the wiring and button up the control cabinet....
(I'm a hippocrit, I need to do the same to my Emcoturn 140!)

Wow, that is a really nice small lathe.
I think I'm going to keep my eye out for one of those.

Reedfirst wrote: ↑Sun Feb 02, 2020 4:01 pm Wow, that is a really nice small lathe.
I think I'm going to keep my eye out for one of those.

Look hard and often!
My understanding is that there were about 300 made. I stumbled on mine.
They are pretty sturdy machines. They have design issues that make you scratch your head.

ATC-Turret teardown Took the 5 pole 60mm motor and retrofitted a Nema23 2 pole. Tested it with the "cheap ass" stepper driver and it works! Next is to get the ATC/Turret PLC in place when I get home on the 14th.

Reedfirst wrote: ↑Sun Feb 02, 2020 4:01 pm Wow, that is a really nice small lathe.
I think I'm going to keep my eye out for one of those.

Since seeing this thread I’ve decided I need one of them too. He’s right though, there aren’t many out there.

I think he has an extra one

In preparation for the Turret control, I listed out what I know and also what I understand I need for Centroid/someone to write (or help me write) a PLC program.

What I know:

• It is axis driven
• 8 position turret with a lock bar(not a pawl)
• Using stepper motor for rotation (ratio = 800 pulses per tool position)
• Has index pulse output from a single rotation encoder (mounted to the turret shaft)
• Has 110vac solenoid to lock and unlock the tool position when AT location
• Can rotate in both directions

What I think I know:

Homing routine sequence:
• Home LAST in axis homing sequence, at the tool check location
• Unlock turret
• Rotate quickly to find marker pulse.
• Reverse slowly past marker pulse
• Rotate very slowly until marker pulse is re-located
• Lock turret
• Set to tool 1

Tool change automatic via G code:
• Must be at tool check location and homed
• Unlock turret
• Rotate to correct tool (bi-directional is preferred)
• Ignore marker pulse if previously homed
• Lock turret
• Change current tool number
• Continue program

Tool change MDI:
• Go to tool check location
• must be previously homed
• Unlock turret
• Rotate to correct tool (bi-directional is preferred)
• Lock turret
• Change to current tool number

Tool change Manual:
• Use Aux 5 and Aux 8 to increment and decrement tool position respectively
• Go to tool check location
• must be previously homed
• Unlock turret
• Rotate to correct tool (bi-directional is preferred)
• Lock turret
• Change to current tool number