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Messages - LerninCNC

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1
General Mach Discussion / Re: Spindle Relay Configuration Questions
« on: May 02, 2019, 10:03:29 AM »
You should connect the BOB ONLY to a 12-24V power supply.
and DO NOT CONNECT a USB CABLE TO THE PC!

(i will explain to you why via PM if you want to know)

Yes, I would like to know.  While I appreciate you sending me the BoB manual it doesn't do a good job of explaining the boards functions.

2
General Mach Discussion / Re: Spindle Relay Configuration Questions
« on: May 02, 2019, 09:48:33 AM »
" switch (FWD-OFF-REV)"

VERY GOOD!
Now One relay should just be soldered to imitate the FWD function of that switch (to get M3 working)
Another relay should just be soldered to imitate the REV function of that switch (to get M4 working)

 
Later Buy a relay for Arduino like:-

https://www.amazon.com/Tolako-Arduino-Indicator-Channel-Official/dp/B00VRUAHLE?SubscriptionId=AKIAILSHYYTFIVPWUY6Q&tag=duckduckgo-d-20&linkCode=xm2&camp=2025&creative=165953&creativeASIN=B00VRUAHLE

It cost peanuts to get M4 working.
Thanks for the link.

3
General Mach Discussion / Re: Spindle Relay Configuration Questions
« on: May 02, 2019, 09:28:46 AM »
Hi LerninCNC,

You can even add a cheap "single-relay board" design for Aduino if you want to implement M4 for spindle counterclockwise spin if you use the unused pins (for the unused 5th axis) to drive a Aduino relay board.

The 5th axis direction pin is jumper selectable and can be used for either the onboard relay or external direction control – it cannot be used for both.

 
The BOB board must be powered by 12-24V otherwise the optically isolated inputs will not work.
USB connection is NOT required

A 5 Volt connection is required for the BoB and the USB connection from the PC is the easiest method.
And (as mentioned by Reuelt) a 12 – 24 Volt supply will also be required to power the inputs and the analogue output of the BoB.

I think it is better to switch the DC side of your spindle.
 

As already mentioned by ZASto this is extremely bad advice.
Ideally, using the BoB relay to switch the AC side of the motor controller via an AC switching solid state relay would produce far less electrical noise and cause less problems than taking any high voltage AC or high current DC to the BoB.

Hope this helps,

Tweakie.


Thanks for the clarifications. 

4
General Mach Discussion / Re: Spindle Relay Configuration Questions
« on: May 02, 2019, 09:27:19 AM »
Are you saying that if I wire the 0-10vdc BoB output to the wiper and ground points on the motor control board that will turn the spindle on and off with a M3 and M5 command?

No
M3 On and M5 off is done by the relay.

Switching the AC side requires "a SOLID STATE RELAY" that uses 0 crossing TRIAC to on and off the power supply. BUT it means you can never implement M4 if you do that. AC is only ON or OFF ie. NO DIRECTION. If you are using a (wood) router and not a VFD spindle, That is the way to do it.

I have both M3 and M4 working with my VFD spindle.
The relay connects to the VFD inverter at low voltage (TTL LOGIC) level at the inverter. One relay turns the spindle clockwise, the other relay turns the spindle anti-clockwise.
(see attached)

Got it.  Thanks.

5
General Mach Discussion / Re: Spindle Relay Configuration Questions
« on: May 02, 2019, 09:26:23 AM »
btw witch spindle Controller are you using?

Currently my spindle direction is controlled with a switch (FWD-OFF-REV) and speed is with a potentionmeter.

6
General Mach Discussion / Re: Spindle Relay Configuration Questions
« on: May 01, 2019, 09:56:53 AM »
Are you saying that if I wire the 0-10vdc BoB output to the wiper and ground points on the motor control board that will turn the spindle on and off with a M3 and M5 command?

7
General Mach Discussion / Re: Spindle Relay Configuration Questions
« on: May 01, 2019, 09:48:09 AM »
The BOB board must be powered by 12-24V otherwise the optically isolated inputs will not work.
USB connection is NOT required

The relay can take 250V AC 10Amps so can switch 110V AC directly.
Or it can also switch DC INSTEAD up to 30V also up to 10A current.

I think it is better to switch the DC side of your spindle.
The 0-10V Analog output of the BOB should connect to the ground and wiper pin of your Speed controller variable POT that now control the spindle speed.


Thanks for your response.  I already have a 12vdc power supply in my electronics cabinet so providing power to the BoB will be easy.

8
General Mach Discussion / Re: Spindle Relay Configuration Questions
« on: April 30, 2019, 09:46:31 PM »
The new BoB came in today's mail.  The board relay needs 5vdc to the coil.  No problem here as I can power it with the supplied USB cable or use a 5vdc "wall wart" power supply.  My motor is rated at 110vdc so I can't wire the relay to the DC side of the motor control board because the BoB relay is rated at 30vdc or 25vdc.  The plan is to wire the relay to the AC power supply to the motor control board.  Does anyone have an opinion as to whether this will work without damaging the motor control board? 

Thanks

9
General Mach Discussion / Re: Spindle Relay Configuration Questions
« on: April 21, 2019, 10:07:55 AM »
Thanks for the manual.  The new BoB will be ordered today.

10
General Mach Discussion / Re: Spindle Relay Configuration Questions
« on: April 21, 2019, 01:08:33 AM »
Thanks for your response.  It doesn't surprise me that my BoB doesn't have the features I need.  It's been kicking around my "spares" drawer for a few years now.  I'll order the board you recommended.


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