[Ntl]

Yes, except this time they want me to measure just one servo.

I also don't remember whether it was pulled up or down as it didn't seem to make any difference.

A few more questions bear with me since I would want to know the answers if it was my equipment.

1)Did they tell you how to enable and disable for testing?

2)Did they say what you should be looking for as far as the measured voltage goes? (What should it read exactly for enabled vs. disabled)

3)Also did they say what's next if one motor works?

[davida1234]

I did ask them #1. They told me to disable it in UCCNC.

2) I'll let them evaluate that.

3) Let's take one step at a time.

My guess would be to measure the other ones too to see if one motor is faulty.

[davida1234]

My results per Teknic's instructions, emailed to them today:

Hi,

Results with only one servo powered up and connected to the BoB
as outlined under #1 and #2 below and enabled/disabled in UCCNC:

With the servo enabled, the voltage between the “measurement points" reads 0.197 Volts.
With the servo disabled, the voltage between the “measurement points" reads 0.496 Volts.

Thank you,
David

[Ntl]

Sounds like it's doing something, so that's good. Did you try all the other motors to see if you get the same numbers?

[davida1234]

CORRECTION!

Sorry about the typo.
Email to Teknic has been corrected as well.


With the servo enabled, the voltage between the “measurement points" reads 0.197 Volts.

With the servo disabled, the voltage between the “measurement points" reads 4.96 Volts.

[davida1234]

.

No email yet from Teknic.

In the meantime, I will resurface the BB ply spoil board.

I will use a 1.5" Freud surfacing bit and I will also run the
DC while doing it but without any brush, just the two DC
hoses to see just how much dust and debris it captures by itself.

The two hoses (pipes) are about 4-1/2" above the cutter:
Attachment 420102

To see the remaining dust and particles, two black painted
plastic strips are placed to the front and the side:
Attachment 420104

[davida1234]

Front transparent screen in place.
Blue crosses are taped to the screen:

[davida1234]

Email from Teknic:

Hi David,

Thanks for the information. The voltages that you're reading should be sufficient for accurate functionality with the HLFB and your controller.

I would recommend next to test if the controller is correctly reading the HLFB change for this 1 axis.
Once this is completed, repeat this entire test with 2 motors HLFB wired up
(Measure the voltage between the two "measurement points" and verify that the controller is accurately functioning).
After we get 2 motors working, lets move up to 3.
Technical theory and our approach:

In reviewing the C11G breakout, there is a possibility that the resistor alone may not be appropriate for a 4 HLFB system; the current drop between each servo may significant enough where the HLFB is not triggered. We expect to see a higher disabled voltage as the number of motors increase. (For example, the voltage may be 0.4 Volts instead of 0.197 Volts for a 2 motor system).

The good news is that we may be able to use a different resistor or a 2nd resistor in parallel. Increasing the number of motors one at a time will help to give us a better understanding of the behavior of the circuit for recommendations moving forward.

Best,

[wmgeorge]

So in other words, they don't know anymore than you do on how to make it work?

[davida1234]

So in other words, they don't know anymore than you do on how to make it work?

Probably more like: So in other words, they don't know anymore than we guys do on how to make it work.

[davida1234]

A short video on spoil board surfacing:
https://youtu.be/Q4ciOcA4WQw

[davida1234]

The dust hose elbow following the spindle:
https://youtu.be/bFxAPCeL5mU

[davida1234]

I ran the dust shoe base without the brush. Just the
two suction pipes coming down to the dust shoe base.

Although it doesn't suck up any particles from the bottom at
that distance, the pipes do suck up quite a bit of floating dust.

Look closely at the pipe ends:
https://youtu.be/fVfN65rOfdM

[davida1234]

View from a seated position in front of the laptop:
https://youtu.be/BIq9RIzJTcI

[davida1234]

Most of the dust and particles are
contained on the bed behind the screen:
Attachment 420192

Some, mostly larger particles on the laptop, not much dust I could see:
Attachment 420194

Or around the machine:

[wmgeorge]

Probably more like: So in other words, they don't know anymore than we guys do on how to make it work.

Yes, thats it. And they designed the product.

[davida1234]

Test results sent to Teknic based on their last email:


1 Motor:
Enabled voltage: 0.197 Volts
Input 10 (active low): green

Disabled voltage: 4.96 Volts
Input 10 (active low): black

2 Motors:
Enabled voltage: 0.382 Volts
Input 10 (active low): green

Disabled voltage: 4.96 Volts
Input 10 (active low): black

3 Motors:
Enabled voltage: 0.553 Volts
Input 10 (active low): green

Disabled voltage: 4.96 Volts
Input 10 (active low): black

4 Motors:
Enabled voltage: 4.92 Volts
Input 10 (active low): black

Disabled voltage: 4.95 Volts
Input 10 (active low): black

[Ntl]

Well now you know why you weren't getting a change in voltage. Sounds like what I posted last week is exactly what's going on. I'm curious to see what their fix will be and if it's different than the one I told you about.

[Ntl]

I wonder why the 4th motor makes the voltage jump so high. Did you test all the motors individually prior to adding additional motors in series?

[davida1234]

I wonder why the 4th motor makes the voltage jump so high. Did you test all the motors individually prior to adding additional motors in series?

No, I did not as I thought that that's where the transistors kind of stopped working as intended due to resistance or voltage drop.

But I think it is a good idea. Will check.