DIY-CNC-MACHINE.mp4

CNC adapter PCA is for sale! 25 Euro including shipping.
Documentation links of the PCA can be found at the bottom of this description. Please send me an email when you're interested: JEWACNC@gmail.com.
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This D.I.Y. CNC system is made out of many
re-used parts and pieces.
The video is a timelapse of all the work done,
I don't claim the rights of the music, it is just
there to block some of the noise of the machine.

It is controlled with DeskCNC, has 3 (modified)
UHU-servo drives and a power/safety unit mounted
underneath the base plate.
The electronics ensure safe operation, and also
provide diagnostic information in case of errors.
It is (since 1998) the forth version I made, but the
first one which is able to manufacture usable parts.
The earlyer versions where based on stepper
motors which could not really handle the bulky
mechanics.
As an electronic engineer, the mechanical part is
usually the most difficult piece. Luckily my uncle
helped me out a lot with valuable advice and many
many weekends preparing the so needed
mechanical parts required to mount sensors,
motors etc.

The accuracy for X and Y is approx 3uM per step,
and for Z 0.5uM per step.
Ofcource I have to add some mechanical
tolerances, but it is much more than enough to
make small PCB boards, front panels, toys etc.
The speed is set to a low safe value, but can be
increased till 375mm/sec! Even at these speeds
the amplifiers and DeskCNC controller keep track.

On most of the CNC forums available, I often found
that people are strugling to get a good start on
(mainly) the electronic part of converting a milling
machine into a PC controlled CNC system.
One of my colleagues is facing the same issue, so
I decided to design a 160 x 100 mm Eurocard pcb
board which will function as a adapter board for the
DeskCNC controller, and will interface with the
sensors, motor drivers, LED's etc.

(It is basically a plug & play board with all
nececarry connections to easily convert any
milling machine into a CNC system. Even if you
have little electronic experience)

Specification in short:

- Interfaces all machine sensors (END, HOME,
Emergency-STOP etc.)
- Provides safe low voltage power for sensors,
LED's and DeskCNC PCA
- Runs on any voltage 110V AC...240 AC
(or external 12V,)
- Povides accurate diagnostics on sensor
status, hardware errors etc.
- Should fit 99.9% of all milling machine
conversions to CNC systems.
- Safe to use.
- All in/outputs are buffered to withstand
shorts or wiring errors.

I hope to have it ready somewhere in April, if
any of you is interested, just let me now.
I come back to lt later.

Regards,
J

Email: JEWACNC@gmail.com

Documentation links:

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CNC adapter PCA:
http://www.keepandshare.com/doc/2063725/cnc-adapter-pcb-theory-of-operation-9...

http://www.keepandshare.com/doc/2063726/pcb-board-configuration-and-connectio...

http://www.keepandshare.com/doc/2063727/testresults-cnc-adapter-interface-pca...

http://www.keepandshare.com/doc/2063723/assembly-instructions-for-the-cnc-int...

http://www.keepandshare.com/doc/2063724/cnc-adapter-pca-partlist-rev-3-1-apri...
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Category:

Science & Technology

Tags:

• D.I.Y CNC
• DeskCNC
• UHU servo
• Home Made CNC Machine
• mini mill
• CNC router

[JEWACNC]

Today I added information about a PCB board I made.

This board enables you to convert or make a CNC machine yourself.

Links to the documents can be found in the video comment field at the bottom.

Board is 25Euro, including shipping. And you can solder it in 4 hours.

Let me know if you are interested, and we find a way to get it at your place.

Regards,

JEWA CNC

[braga82]

hi,

Thats a good work, i just would like to know if the servos are DC o AC.

Thanks

[JEWACNC]

@braga82

The servo's are DC - brush type motors, together with a UHU servo controller (UHUservo)

For fun I might make a 3phase brushless AC servo drive in the future, but for now the DC version works perfect.

[CncObsession]

Tell me more about your limit switches. I see there appears to be 2 sensors per axis. I only see 1 LED light when triggered. What is the second sensor for? What additional circuitry was necessary to make the sensor work? Are they hall switches or opto? What kind of accuracy or repeatability are you getting? I am in the process of installing some on my machine and keep changing my mind on type of mounting and types of switch. Thanks

[JEWACNC]

Dear CNC obsession,

I use 2 wire VSO (vain switched oscillator) switches in a current loop safety circuit which monitors the current flow.

The LED is bright on if no metal is detected (+-5mA) and off if metal is sensed (less then 1mA) The safety circuit demands that at least 4mA is detected, otherwise it disables the servo of that axis. This is also safe if the cable is broken.

There are 2 sensors: one for homing (course) and one limit,

sensor type Honywell or hytech (is inductive sensor)

[JEWACNC]

The accuracy is extremely good (on one encoder pulse, which is a few uM!) this is because I also use the index signal from the encoder.

This way of working gives excellent repeatability and accuracy, and also makes the position of the VSO sensor less critical.

Since you are busy with a machine as well, you might be interested in the following: the PCB board I talked about below is ready! I try to post links this week. This will make things way easy-er for you!

[Th3mast3r69]

Lol!!!

[Pemberdeer]

These were not the droids I was looking for.

[odv000]

excellent! now you can make parts for deathstar on it right?

[CeciliaEcho]

DIY??!! OMG, I never thought to DIY a CNC mechine!!! It's really impressive. Well the more impressive thing is what u want to do in China. If I have my own university one day, I will definitely hire u to be our professor! Haha~~~~

[Marcelmx3]

Heel erg mooi jouw machine !