Small scratch build 3 axiz CNC

[bofred]

Yes, google translate is spot on:)

And thank you for all feedback. I really need feedback since this is my first CNC.
The sand filled beams sounds nice. Problem is that I have so many holes to plug. The lower Xbeam has a total of 26 holes in it. 8 on each side to fasten it to the Zbeam and 10 for the linear bearing screws. I once had loudspeaker with sand filled stands and that worked really good.
I'm a bit worried that the Z moving part becomes weak but that is a later problem.

The electric cabinet could be as you say a bit noisy. Thank you. When I made it I figured the drivers had grounded houses and the "ring trafo" should not radiate that much magnetic fields. But I have the break out board unprotected and I don't know how sensible it is. I am able to fit a plate between the trafo and the drivers if I need. I planning on having shielded cables for the motors but the "on to the break out board cable" from the PC is unknown (cheap cable).

Here is a short video clip of when I test ran the motors. The wantai driver seems to have plenty of power. Cheers!



http://www.br-automation.com/downloa...MASMOT-ENG.pdf

[bofred]

Ive got the side plates. They are water cut in 10mm thick aluminum. Ive tighten the upper part of the gantry and it feels really stiffer than I thought. I tried hitting it with a peace of wood and I could feel really small vibrations when hitting from the side so I might need the back plate as well. Otherwise it feels like hitting a rock

[bofred]

The Y-plate is on its place and all screws in the frame work is tightened firmly (a lot of screws). It took me almost two hours just to saw the plate out of 20mm aluminum and machine the edges. And one hour more to make the holes for the screws. It seems to slide nicely on the bearings and it feels solid already. No ball-screw installed yet.

[GEOFFREY]

Starting to look very useful. Parts mainly form the scrapyard? We could do with a few scrapyards over here that keep all that lovely ally profile in stock!!! Great stuff. G.

[bofred]

Thank you. Yes. The item rods are from scrapped out prototype machines. As well as the stepper motors. I have been working with machine tests for 18 years on different kinds of machines mosty in the pick and place buisseness. So I know where to find the goodies ;)

[JAZZCNC]

Looking good Bofred but I see a potential trouble spot that could be made much stronger for not a lot work.? . . .

The gantry rails mounted directly to the profile with no reference edges for alignment and support could slip under use just hanging from the rail bolts. I would mount rails to a piece of plate with machined reference edges that is same width and height as gantry then mount that to profile. It will massively stiffen the gantry and allow much easier setup.
I would also put a slot in front of plate for ballscrew bracket to come thru which will offer protection to the ballscrew/nut.

[bofred]

Looking good Bofred but I see a potential trouble spot that could be made much stronger for not a lot work.? . . .

The gantry rails mounted directly to the profile with no reference edges for alignment and support could slip under use just hanging from the rail bolts. I would mount rails to a piece of plate with machined reference edges that is same width and height as gantry then mount that to profile. It will massively stiffen the gantry and allow much easier setup.
I would also put a slot in front of plate for ballscrew bracket to come thru which will offer protection to the ballscrew/nut.

Thank you Jazzcnc for good feedback,
I might have underestimated the forces on the X linear rails but my milling skills is very limited. Its only M5 screws on the linear rail.

Maybe I can make a support plate screwed in the item rod slot above the rail and after the X-rail is aligned against the Y-plate slide and tighten the support plate against the rail so it will not slip out of position. That would be an easier solution for me.

I also might combine the support plate with the ballscrew protection plate you suggested with a slot for the X-linear movement. That was a good idea. I dont know how the connection between the ballscrew and X-plate looks like yet. But it might work :)