DIY PCB components

DIY PCB components

Postby Warznl » 18 Sep 2012, 20:34

Hello Guys.

My name is Warren and have just become a user here. I have some questions regarding the components of the DIY MK1 PCB.

First let me inform you I am a total noob when it come to electronics, hence the post.

First off I downloaded a copy of the parts list, yes very confusing but I managed to figure most of it out.

The thing I couldn't figure out were the RKey and the RExt what is the 8x 10K I spent 3 full days looking at every component on Conrad.nl trying to compare the picture with anything that has 10K and if I cant get a long one of those things is it possible to use individual components for the 10k?

Thank you and looking forward to a reply
Warren
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Re: DIY PCB components

Postby Andrej » 18 Sep 2012, 21:07

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Re: DIY PCB components

Postby Warznl » 18 Sep 2012, 21:39

Thank you for the fast reply.
I looked at the site it is a very professional company just a pity they dont sell to private people.

I will just have to look for a place that will sell them to me...
:mrgreen:
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Re: DIY PCB components

Postby Andrej » 18 Sep 2012, 22:57

Are you sure they don't sell to private people?

I also have sime spare. I can send them to you but you should pay shipping costs.
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Re: DIY PCB components

Postby Bakha » 19 Sep 2012, 06:07

resistor network, you can buy freely, for example:
http://www.digikey.com/scripts/dksearch ... TWORK++10K
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Re: DIY PCB components

Postby Warznl » 01 Oct 2012, 14:25

This is a nice looking place to buy components however I live in the netherlands (Holland) and if I order from them it's going to take forever to get my stuff. But for those who are interested try these guys http://www.reichelt.de
I placed a order thursday night and recieved my package this morning before noon from UPS :mrgreen:

Bakha wrote:resistor network, you can buy freely, for example:
http://www.digikey.com/scripts/dksearch ... TWORK++10K


Anyway I have now finished making my pcb and now I can start with the components. I will upload some pictures later of my progress. :lol:

Now for my dumb question for the day :?
On a black elco capacitor is the white stripe the plus or the minus? :oops:

Thanks again
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Re: DIY PCB components

Postby Andrej » 04 Oct 2012, 10:43

ELCO capatitors have stripe on minus.
Upload pictures and I can check if you did it correctly (if images are detailed enough).
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Re: DIY PCB components

Postby Warznl » 04 Oct 2012, 19:02

Thanks for that, I will upload pictures anyway for you to look at although my board looks very unprofessional it works for as far as I could test it.

Here's a link to the pictures
https://plus.google.com/photos/117847203296354172730/albums/5794478304645714769

Like I said this is the first time I am building anything like this....
Now my next question is about the stepper motors and how to connect them to the board without burning out the board.
So what type of stepper motor should I use and would I need a relay circuit with a separate power supply for the steppers?
Thanks again guys :D
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Re: DIY PCB components

Postby Warznl » 11 Oct 2012, 11:35

Hello guys

I purchase a whole stack of used stepper motors and I want to know if I can connect them directly to the PCB or do I need some other stuff.
Thanks
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Re: DIY PCB components

Postby Andrej » 11 Oct 2012, 23:11

You need motor drivers.
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Re: DIY PCB components

Postby Warznl » 12 Oct 2012, 11:52

Would you guys have any diy plans so I could build some motor drivers. I am really enjoying this project.
I also have many different stepper motors half of them I cant find the data sheets for them on line will this be a problem when I want to build a driver?

Thank you
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Re: DIY PCB components

Postby Warznl » 28 Oct 2012, 17:39

Hi guys

Again I seem to be pulling out my hair. I bought a bunch (± 70 pieces) of second hand uni-polar stepper motors from old office copiers and s scanners. My problem is I cant get 1 to work I have tried building 2 different motor drivers thinking I might have messed them up I built 3 of each type and still nothing.

Here are the links for the 2 drivers I tried.
http://electronics-diy.com/stepper-motor-driver.php
http://home.cogeco.ca/~rpaisley4/Stepper2012Unipolar.html

Can stepper motors break? are these designs good. Please any info will be welcome.
As far as I understand all 6 wire stepper motors have the same wiring diagram -+--+-
And what is better a Uni-polar or Bi-polar stepper I have read so much on the internet that I am totally confused and I cant seem to find a simple strait forward answer.

Thanks Warz :cry:
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Re: DIY PCB components

Postby Warznl » 08 Nov 2012, 00:22

Hi guys

Well I am happy to say that my stepper driver arrived.. Thanks Andrej for the fast postage :D

Not to the issues I have I connected everything up according to the manuals and I still cant get my motors to work, I have no idea what the problem could be as I am sure my new motor drivers are good.

I connected a light to the driver board replacing the stepper motors to see if they were getting current but nothing happened, no if I understand the workings of the driver the controller sends a signal to the driver through the step and the direction is either on or off with (5v or Gnd), so theoretically the light bulbs should light.

I took some 3mm LEDs and inserted them into the ribbon cable on the step pin and the direction pin and ran the program and the LEDs lit up for the step and dir. The direction LED was very bright but the step LED was very low. Here is a picture of my setup.

https://plus.google.com/u/0/photos/117847203296354172730/albums/posts/5808184959914334914

In the picture you can also see the stepper I was trying to use. I is a unipolar stepper but set it up the and described in the user manual.

If anybody has a clue what I am doing wrong. I have spent 2 days now trouble shooting and am coming close to using the board as a target :cry:

thanks Warz
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Re: DIY PCB components

Postby Andrej » 08 Nov 2012, 08:06

Stop! You will destroy controller if you connect LEDs to step and DIR pins!

MotorDriver2.5A needs high enable signal. Easiest way to do this with Mk1 is like this:
motor_enable_Mk1.jpg
5V connected to motor enable signal
motor_enable_Mk1.jpg (48.56 KiB) Viewed 9883 times
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Re: DIY PCB components

Postby Warznl » 08 Nov 2012, 08:39

Were would that be on a DIY board.

I will not be connecting anymore LEDs to the controller.... Sorry for that :oops:

Thanks
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Re: DIY PCB components

Postby Andrej » 08 Nov 2012, 18:59

You need to route 5V to enable pin.
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Re: DIY PCB components

Postby Warznl » 08 Nov 2012, 23:00

Thanks I figured it out.
I am getting to the actual build of the machine itself. I am wondering if it is possible to use the A axis as the mill itself, or should I just buy a router and mount it to the gantry ?

Anyway I would like to thank all involved for the help getting started and as soon as I have finished building the machine I will post some pictures for you all to see. :)
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Re: DIY PCB components

Postby Andrej » 09 Nov 2012, 07:44

Buy router and mount it to the gantry.

We are waiting for pictures :D
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Re: DIY PCB components

Postby adiaz » 10 Nov 2012, 20:14

I also manufacture my own PCB axis control.

Thanks to the schemes in the DIY.

Some photos:
Attachments
Placa CNC.JPG
Placa CNC.JPG (116.58 KiB) Viewed 9784 times
Placa Cnc montada.JPG
Placa Cnc montada.JPG (125.81 KiB) Viewed 9784 times
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Re: DIY PCB components

Postby Warznl » 12 Nov 2012, 22:51

That looks really nice.
I am still trying out different ways to connect my steppers to my axis. So far I tried used a m5 thread but I dont think the motor likes that idea very much :D

It started getting really hot almost to hot to touch. so I am going to have to make some sprockets and gears. I will have some pictures soon.

Later Warz
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Re: DIY PCB components

Postby skillalot » 14 Nov 2012, 18:11

Steppers need to be hot. If you can just keep tour hands on it, the amperage is good. Normal operation temperature is 50 - 60 degrees.
Adding sprockets and gear doesnt make your stepper run cooler. When standing still your motors are powered aswell to keep it in place. Most drivers reduce current when standing still for a while, not all though...
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Re: DIY PCB components

Postby johnsattuk » 14 Nov 2012, 22:16

skillalot wrote:Steppers need to be hot. ...


Not sure that Steppers need to be hot. :?

Heat is wasted energy, a result of getting the max power out of a given frame size, so they are designed to withstand the heat generated, but bearings, grease, magnets and fingers don't like it. :roll:
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Re: DIY PCB components

Postby Andrej » 15 Nov 2012, 23:48

If steppers are not hot then they are underpowered.
Most stepper motors can handle temperatures of up to 130 deg. C (class B insulation).
I set current on driver so that motor temperature does not go over 80 deg. C.
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Re: DIY PCB components

Postby johnsattuk » 16 Nov 2012, 09:59

Andrej wrote:If steppers are not hot then they are underpowered.


Until the research into super conductors gives us greater efficiencies and cool motors :mrgreen:
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Re: DIY PCB components

Postby Bennyfly » 21 Oct 2014, 09:15

i2c interface with pic18F2550

new e PCB for external i2c display 16x2
please contact if interested.
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