Messages

51

General Mach Discussion / Re: Yes - Another TB6560 Motors Not Running Thread...

« on: October 08, 2017, 06:56:06 AM »

I know the thread is an old one but I have a similar problem, just got my machine fired up but no motors, I am using an ECG-Savebase BOB board with an enable connection which goes to TB6600 Stepper drivers, first problem I found was the 24volt motor PSU was in fact 12 volts but should still work but my main concern is the GND connection on BOB board is not going anywhere and I am sure it needs connecting to 0volt of 24volt Stepper driver PSU, I have a small scope which I will try and trace signal but have you any thoughts of this ground connections need linking together

Regards John

52

General Mach Discussion / Re: Motor Tuning with 2 motors on X Axis

« on: October 04, 2017, 05:57:21 PM »

I thought as much I suppose once I have say "X" motor tuned and then connect "A" as the slave then insert the same numbers in that drives tuning, then once I have 2 motors connected splits the load so it would be trial and error to change the velocity,acceleration  to the optimum , and then make sure both axis have the same steps per inch, Velocity and acceleration.

Regards John

53

General Mach Discussion / Motor Tuning with 2 motors on X Axis

« on: October 04, 2017, 03:42:42 PM »

Hi, I am about to power up my CNC build and I have 2 motors on the "X" axis which will run 1 CCW and 1 CW how do I setup the motor travel and tuning, I presume I disconnect a motor and do one then set "A" the same values, can anyone advise.

Many thanks John

54

General Mach Discussion / Re: Connection of Mach3 to TB6600 Drivers

« on: October 01, 2017, 07:34:19 AM »

Think I found answer on Yu-Tube, NO it is not connected its only used in common cathode mode to the stepper drivers BUT can this be confirmed also will the "?" mark go away once I power everything and configure all.

Regards John

55

General Mach Discussion / Re: Connection of Mach3 to TB6600 Drivers

« on: October 01, 2017, 07:09:31 AM »

Connecting system bit by bit, I have just connected parallel cable and USB lead to breakout board, I have a "?" in Mach3 in Device manager also on breakout board the long terminal block has 5v going to TB6600 stepper drivers but cant find any reference to the connection next to this 5v the "GND" going anywhere, have you any idea if this should connect to the general 0volt of the power supplies or is it a PC only ground, and is opto coupled on the breakout board.

Regards John

56

General Mach Discussion / Re: Connection of Mach3 to TB6600 Drivers

« on: September 25, 2017, 02:48:42 PM »

Thanks for good wishes.

Just another point I think I have picked up looking at the BOB config, I am using BOB pwm connection but have Spindle motor supply connected directly to the power supply, and looking at Mach3 Ports & Pins config to enable spindle motor and spindle setup do I need to connect power to spindle controller via the relay on the BOB so the turns motor on when relay is energized.
The pink wire in pic is the PWM connection
Also Motor output config I think as I have 5 volts connected to the 3 TB6600 5v  +Dir, +Pulse and +Enable input I am using common-Anode wiring

Thanks John

57

General Mach Discussion / Re: Connection of Mach3 to TB6600 Drivers

« on: September 24, 2017, 02:00:42 PM »

Thanks for all comments this has been very useful, I got to finish the Bed yet bit more wiring and tidy up, one problem I may have to fix is, I didn't realize the weight of "Z" axis assembly so may have to change to supported bar,  think I have a deflection of about 0.5mm on the "X" axis in the middle, more expense LOL

I will post when we are up and running, fingers crossed.

Regards John

58

General Mach Discussion / Re: Connection of Mach3 to TB6600 Drivers

« on: September 24, 2017, 09:16:25 AM »

Thanks for input, I know what you mean about Earth loops I did go round all case and remove any earth connections, the PSU GRN I will take directly so nearest point of socket, I did have an earth connection inside a TB6600 but after I took apart it disappeared,
I take it I need to connect both 0 volt lines of the 2 power supplies larger one is connected TB6600 and the small is the spindle supply which at the moment don't have a connected 0 volts the only other issue I have is the PC power supply I am using for BOB 12 volt supply and a few misc items but this supply is earthed inside the case.

Many thanks for help

Regards John

59

General Mach Discussion / Re: Connection of Mach3 to TB6600 Drivers

« on: September 24, 2017, 06:52:40 AM »

Thanks for replies, I was having nightmares over 1st reply, but I have read quite a lot about does and does and don't, and like you say don't disconnect or unplug power source from motor while turned on and also I think I will ground all 0 volt lines to my case, I am using an old PC Desktop case to mount all drivers and Power supplies.
One thing I did find is from www.twovolt.com is a stepper driver schematic with Schottky Barrier Diodes to reduce spiking from motors I may experiment with this but not sure what the motor pulses look like so wont try with the TB6600 drivers.

The thought of buying Gecko Drivers is a no no at over £100 each would break the bank as I am retired and just using as a hobby.

Thanks for reply

Regards John 

60

General Mach Discussion / Connection of Mach3 to TB6600 Drivers

« on: September 23, 2017, 07:52:42 AM »

Hi, Thanks for allowing me to join forum, I am new to CNC but experienced in Electronics and Computers, I am building a CNC Machine based on a NYC CNC Project but a bit higher spec Using Mach3 driving a BOB and 4 TB6600 stepper Drivers to 2 x "X" axis, "Y" axis and "Z" axis and a spindle motor working on the PWM port of driver board.
My Stepper motor power source is 24 volts.

The first quiry I have is the Stepper drivers, I am using Nema 17 for X and Y motion but there are 2 settings on TB6600 2/A 400 steps or 2/B 400 steps, which one do I select, also the motor Rating is 1.68amps/Phase so I selected 1.5 amp switch, for the  Z axis I am using Nema 23 which has 1.8deg so 200 steps and set to 3 amp.

My other concern is reading different forums its a little worrying to find Stepper drivers are burning out so is there something I can do to protect this.

Also the BOB has the USB supply from the Computer which is running quite a few things i.e Limit switches, and the PUL+, DIR+ and ENA+ is there enough power being supplied by PC to power all these things as standard USB 2 will only supply 400ma.

Most grateful for any advise
Regards John