[krazatchu]

Hey...

Ya, R26.. except they were 10 ohms... (SMD resistor says 100, is 10 ohms)...
There was also another on a small PCB with the 4093 (not on schematic)...

With both of the resistors in series (20ohms total), the servo with a Renco encoder that had an LM339 already wouldn't work...

Once I removed the 20 ohms, it was ok...


I will post some info about the control board a bit later, I'm currently working on it...

Michael

[moraru]

Hi Michael,

Any progress,

Moraru.

[krazatchu]

Hey...

Progress? On which thing? The servo board is working great...
We just got the machine from the machine shop this morning ...
It's a z,x and rotational axis 3d printer... (like a crane)...
It's quite tall at about 2 meters...

Got the Z-axis going today, the servo board is working great...
Will have the X-axis and rotational axis going tomorrow...
The rotational axis has a 400w bldc, the x and z are dc brushed...
Just got some problems sorted out with the rf transceiver chip...

It ships to Austria on Friday so it's a bit of a rush getting it all done...
Still have some coding to do make it all play nice together...

I will post some info prolly this weekend about the control board ...

Thanks!
Michael

[moraru]

Hi Michael,

I happy for you success.

I still working on servo board.

[moraru]

Hi arisov, Michael,

I finish my new PCB and work great.
Keep in touch.

Thanks a lot.

Moraru.

[moraru]

hunter07,

This is, you need download ExpressPCB for open and rest....

Success ,

Moraru.

[zhenyusen]

This version is a bit updated from the last eagle files I posted...
If anyone wants the new version in Eagle format, I will upload them...

Michael...

I am a beginner, when the EAGLE can upload new files? Thank you!:cheers:

[krazatchu]

Here are the most recent Eagle files....
And a picture of the populated board...

Enjoy~~

Michael

[contactirfu]

how do ya plan to get the heat off the mosfets?

[krazatchu]

.

[krazatchu]

The heat comes off by itself... laws of physics ?? (joking)

The FETs and diodes are the same height... There are 3 holes between the FETs...
If a heatsink is required, it can be mounted across the FETs and diodes...

In practice, with less than a 100w motor, I found the FETs didn't even get warm...
For anything larger than 150w, hardware current limiting is prolly a good idea...
On this board there is no hardware current limit....

It would have made more sense to mount the FETs on the bottom...
And then it could be mounted to a case or larger heatsink...
However, as this was for an art project, I thought they "looked" nicer on top...

Michael...

[contactirfu]

art project !

[tivoidethuong]

Here are the most recent Eagle files....
And a picture of the populated board...

Enjoy~~



Michael

great work, i'll try

[celesket]

I find single layer project...
http://www.c-n-c.cz/viewtopic.php?t=...12b72d503355df

[arisov77]

Celesket, You are a message #14 (http://www.cnczone.com/forums/showpo...2&postcount=14) read?
Jozefp(cnczone.com) = Pájač (c-n-c.cz)

[jozefp]

Celesket, You are a message #14 (http://www.cnczone.com/forums/showpo...2&postcount=14) read?
Jozefp(cnczone.com) = Pájač (c-n-c.cz)

:cheers:

[arisov77]

Code in message #83 (http://www.cnczone.com/forums/showpo...2&postcount=83) does not work.

Here is codes for AtMega48. I have checked them on model servocontroller ("on table", without CNC machines).
Servo_Mg48_16Mhz_v3_4 (for Qarz=16MHz)
- has limited limits of the change PWM before +/-240 (for more reliable work bootstrap driver)
+
Servo_Mg48_20Mhz_v3_5 (for Qarz=20MHz)
- has Lowered frequency PWM before 19,5KHz

[Tommyy]

Hello there, I'm new one on this forum.
Could be possible to implement a dual loop in russian UHU.
Thanks

[arisov77]

This not UHU_Servo, before UHU it is necessary else grow this servocontroller.
I personally to dislike in this variant (the original ElmChan + modernization Alexander Karsakbayev + I) that little adjustments and so this variant to adjust in some cases harder than UHU. This on my "glance".

Could be possible to implement a dual loop

Dual loop = loop to velocities + loop of the current? You this has in view of?

[Tommyy]

I know this is not the UHU servo , I'm only asking if you can implement in your atmel chip
a dual loop PID control because I have an old CNC machine with a old control unit. I will upgrade this control with a new on, maybe with your chip ? A problem is in my machine a lot of backlash between the motor and linear motion (about 1/4 motor turn). My old control unit use a linear scale encoder, so I thought maybe is posible to add an extra rotary encoder to the motor to have faster motor response without lot of overshoot.
So I though make a control unit with two encoder. Could it be possible ?
I start building a PID control with an ATMEGA8 in FastAVR program but for now without
a good success.
Thanks for your quick answer