1200mmX900mmX170mm 4axis cnc

Just a casual observation for anyone looking to re-use these schematics.

Some, probably not all, but certainly the cheap and nasty BoB that I have in front of me (and I've just re-tested) - which provide a 0-10V output to the spindle, and a 12-24V supply to provide this 10V reference on board... will use this same onboard 10V supply to drive the LED anodes on the opto-isolator inputs (so to switch the input, you connect the coupler's LED's cathodes to ground [via sensors, etc]).

My point?, for these cheap BoBs, to use the inputs you still need to supply a 12-24V supply, as well as a 5V supply to the BoB.

Like I said, probably won't apply to all BoBs.

Thanks everyone for the help and the very helpful info, it is time to make my study now... :-)

The last two days we had temperature drop and some rain so I went to workshop and lift the gantry and push the x axis rails in the y axis bearings.
I weighted the gantry out of curiosity and the scale show 32.5 kg with out the spindle and the aluminium plates at the place of mdf,I wonder if the two 4nm motors will be able to move the gantry and cut at acceptable speeds.:-(
To lift the gantry I made some kind of a crane with some scrap metal beams I had in the shop.
Attachment 24461
Attachment 24462

The 4Nm motors are STRONG! no need to worry :D


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I hope or else I will have to rotate the ballscrews with my hands! Haha!!!

Cut the second base for the x axis motor,the right angle is from the aluminium beams,I cut the length I wanted and then separate the square to two angles,each one for each x axis motor.
Attachment 24465
Attachment 24466

Do you guys prefer to mount the electronics direct at the electronic box with screws and nuts, or first on an mdf and then in the box?

Myself - a steel plate mounted on stand-offs mounted into the case. That way you can remove the whole assembly to work on.

Steel plate for ground issues,or because it is more stable?

It's cheap. Just like me!