And it is my relay board and its scheme.

@Gerald & Dmitry,

I think I did see that the shielding of the control (BoB to Drivers) is attached to the cooling plate of the drivers, I cannot enlarge the picture to confirm. it would be better to ground (put on the 0V side) the shielding on the Bob side.

if you want we can discuss this on a other thread, I am far from a authority though in this subject and haven't been doing electronics design for over 12 years.

Ries

Greetings, Ries.

I do not understand, what problems? Try to draw a wiring scheme of it.

Dmitriy,

shielding of signal cables should be done at the signal source, in this case on the BoB (PMDX) side, not on the gecko side.

Shielding the signal cable on the cooling plate of the gecko driver might even introduce more nasty effects (EMI) because usually this ground is what's called dirty.

Since the ground of the power supply is attached there, and the gecko's are connected to the power supply (high current) this might introduce more EMI then not shielding at all.
Also EMI in the ground plate might come from external interferences outside of the box it's not 0V! and might contain any other fluctuations from for example plasma welders, drills, saws etc.. So don't use a dirty ground for shielding signal cables.

Beside, from computer tot BoB is electrically connected, but from BoB to Gecko it's isolated using opto couplers (on the gecko side) . So it's best to keep this circuit as much separated as possible.

Lastly, and this is what gerald also mentioned, reducing EMI in your signal cables can also be archived by:

1) Not lying the signal cables and high power cables (110V, gecko power, stepper cables) close next to eachother in one line, it might look better, but it can introduce a lot of EMI in signal cables. Lay thm as far away from each other as possible, left, rights side of your control box for example and in separate cable ducts to insure separation.


2) If you do need to cross (in space) signal cables then do so in a 90 degree fashion, so
they cables don't 'see' each other. This technique is also frequently used in RF circuits where coils need to be layed out 90degrees from each-other to minimize interference.




Ries

Ries, many thanks for a competent substantiation. I think, already soon I can check up it in practice :) And unnecessary contact pieces to cut off is never late.

Dmitry

27-04-2010.
Greetings to all builders MechMate.

After a long break I had a possibility to continue work on the machine tool. Result on a photo.

27-04-2010
Time has come to take in hands this...

I like the wind-up piece between the table legs.:D
Is RED the official colour of MM's in Russia.... looking smart

Those Motion King's are looking good on the belt reduction

Red and Cherry :)

Дмитрий молодцом !!! Я с товарищем такой же собираю. Ток покрашу по другому.

Dmitry the good fellow!!! I with a companion same collect !!!Only I will paint on another))))))

Nice Work Dmitriy!

Almost there! Keep it up!

Looking Great !!!! Keep up the great work !!!

Your shop is scary:eek:

Dmitriy, your build is looking real good. Those belt drives are nice and looks like a very polished design.

Charles, I was just about to say the same thing but my shop looked a little like that until I cleaned it out. I'm sure a fresh coat of paint on the wall would make a huge difference.

Greetings to all!

It seems, I have finished a layer pad of wires "on a paper". Here my scheme of MM
http://img-fotki.yandex.ru/get/4301/..._aaae94db_orig

Dmitriy, what software did you use to draw out this layout, I haven't gone thru the circuit- but a good effort i feel.

Hi, Irfan.
One of my trades - the designer. Therefore I professionally own Corel Draw and Adobe Phonoshop. In most cases I use these programs - for me so more conveniently and easier. Also I use AutoCad and many other programs.

Thank you Dmitriy, now you can cut those beautiful designs on corel with the MM

That drawing should be part of the mechmate parts, beautifully done!

As I did relay and laser boards. The small instruction in pictures.

Dmitriy that's a professional job you've done there, congratulations.
I'm thinking of buying a Roland allready :D

I think we have more Pro's than Rookies here, very nice work. Keep going :)

...or you can ask one of the members that has a MM already to machine the single layer board for you and not have to touch the chemicals! Just thinking....:)

30-06-2010
It is finished "kitchen table" and I have seen the first movement of the motor of my MM.

Link to video (30Mb)
http://www.youtube.com/watch?v=WUHlVGlatcA

And a few photo of my "kitchen table"

Very clean and well executed. Look at that custom standoff!

08-07-2010.
Small progress in building.

Nice clean design & execution, would love to see them kick dust.

Vishnu

That is very neat!

Man that looks awesome. Cool work on the circuit board.

Looks great, care to share the circuit?

Look at his 2 June post.

Thanks

Greetings to all!

I am very glad that my work was pleasant to you. I have a little changed the scheme and have checked up on the mi MM, all works.
Here I spread the total scheme, it is possible to someone will help.
http://img-fotki.yandex.ru/get/3416/..._daf95000_orig

Success to all in building MM!

I have excluded button E-stop on Z-car. I think it difficultly to use, when the spindle is in the table centre. To reach edge Y-car much easier.

Sometimes we are walking on top of the big table while the machine is working, that is why we have buttons on the small car.

...and when the machine is cutting near the end of the table (where most small part work happens) the Car based Estop and control buttons are essential to daily operation. Actually, come to think of it, I can't remember the last time I used the end buttons!

Just my 2 cents.

Z-axiz on linear bearings and the ball screw
 

Greetings to all again.

After long think and experiments I have stopped on this variant of mine Z-axiz. E-bay - a great thing! I have bought there linear bearings and the ball screw.

Full travel of mine Z-axiz makes 250 mm. I plan to process on the 4-axiz details to 500 mm in diameter.

That's one heavy duty z axis!