Hendrik's CNC router

[Mister H]

I already started a thread but now I see that it is in the wrong section (http://www.cnczone.com/forums/showthread.php?t=30066), my appologies.

So now in the right place

I have recently started designing my first CNC machine
The dimensions the cutter can reach are about 90cm x 70cm x 10cm

As for the linear bearing I use the following parts:
20mm steel rod for the x and y shafts. for the x axis I will support this rod in the middle to prevent bending.
the bearing itself consists out of 2 bended (120 degree) plates (4mm thick) welded on a plate for fixture. on these plates i connect some bearings (6 on every side)

for the Y axis i'm not sure weather I'll use a sliding bearing or the same bearing as described above.

The z-bearing is a sliding bearing on a 15mm shaft.

I already bought 3 1.7Nm steppers and for the drivercard i'm building the PICstep at the moment. I have some trouble finding a shop that sells the IC DIGIKEY LMD18245T-ND for a reasonable price over here in Holland. I can order them at digikey, but i don't know if i have to pay taxes and importing costs etc. Does anybody know where to find them in europe?

every comment on the design is welcome since i'm not sure weather the design is stiff enough.

Many thanks

Hendrik

[edit] added a picture of the linear bearing i want to make

[bp092]

what did you model that in?

[joecnc2006]

On you bearing slides, what are you going to use to prevent the Gantry from lifting up?

[Madclicker]

Originally Posted by joe2000che On you bearing slides, what are you going to use to prevent the Gantry from lifting up?

120 degrees will wrap the pipe.

[svenakela]

Originally Posted by Mister H I already started a thread but now I see that it is in the wrong section (http://www.cnczone.com/forums/showthread.php?t=30066), my appologies.

Hendrik,
I moved your other thread from the engineering forum to one of the DIY forum. At least a little bit better place for the thread.

Regards,
Sven, moderator

[Mister H]

Originally Posted by svenakela Hendrik, I moved your other thread from the engineering forum to one of the DIY forum. At least a little bit better place for the thread. Regards, Sven, moderator

Thanks, i couldn't figure out how to do it myself.

@bp092, I modelled it in Solidworks and rendered it to make it more realistic.

What is everybody's opinion about my Y-axis. Should I go for the home made bearings or the sliding bearing. The advantage of the home made bearing is that I can make a construction to support the rods.

[Brunow]

Zeer mooi begin. Wegens dat je van nederland bent ken je toevallig http://www.mijncnc.web-log.nl/ zijn mannen die ook al een tijdje bezig zijn.

Nice start! Where did you buy those steppers?

[joecnc2006]

Originally Posted by Madclicker 120 degrees will wrap the pipe.

Oops, you are right, don't know what i was thinking, guess we all slip sometimes.. lol

[Rance]

Hendrik, All looks well, except as has been mentioned before with stiffening the gantry sides. how do you plan on building your bearings (Post #1 last pic)? Welding?

[Mister H]

Originally Posted by Rance Hendrik, All looks well, except as has been mentioned before with stiffening the gantry sides. how do you plan on building your bearings (Post #1 last pic)? Welding?

yes I''m going to weld this. maybe I have to put some reinforcement ribs in it

[Mister H]

so what do you guys think about this set-up for tha gantry (it is just a principle sketch, it isn't completed, no place for z-axis yet!!)

And would you go for 20 or 30 mm rods?

[Guldberg]

If they are supported like that, 20mm will do, proberly less if you like or a hollow pipe. The solsylva has proven that concept