1200mmX900mmX170mm 4axis cnc

[Nickhofen]

Hello everyone.
This is Nick from Greece.
I am looking forward to build my own cnc and to avoid the most mistakes that will cost me money, time and mental brakdown!
Althought I am a member at other cnc forums,I choose to post here my attempt for some reasons that I will prefer not to analyse right now.
Sooo, I am planing to build a cnc with the dimensions I wrote above.Steel frame and bench, I am planing to combine welds and screws for the bench since my workshop is small and I will have to build the machine outside the workshop and disassembly it and reassembly it again in the working area, this will also be a one man build , so this way it will be a little bit better for me to relocate it.
The cnc will be used most for wood working, guitar building, etc and I will be pleased if it will be rigid and accurate enough so I can cut aluminum parts.

Caution My cad abilities are awful,lol, prepare your eyes!!!
CAd program I use is Rhino 4 and Vectric Aspire 4 for cam.

Thanks everyone for taking the time to read and special thanks to everyone that will participate to that attempt!!!

[Nickhofen]

Yesterday at work I felt very lucky, since I thought I found my machin ,almost ready ,build for me!!!
But unfortunattely someone place an engine on and I lost my chance.

[Nickhofen]

Workbench plans.
50x50x3mm build, any suggestions?

[AndyUK]

Hi Nick,

I'm still learning, but some of the best bed frame designs I've seen have a bed which attaches to the legs with screws, so you can change the height of the bed, or swap it out for a different one in the future. The other thing I thought was quite sensible would be room at the front and sides for sliding large pieces in underneath to work on their edges - looks like you've hit the nail on head already for that one though!

Hope that helps!

[Nickhofen]

Hi Nick,

I'm still learning, but some of the best bed frame designs I've seen have a bed which attaches to the legs with screws, so you can change the height of the bed, or swap it out for a different one in the future. The other thing I thought was quite sensible would be room at the front and sides for sliding large pieces in underneath to work on their edges - looks like you've hit the nail on head already for that one though!

Hope that helps!

Hi Andy.
Somehow I miss your post earlier.
Thanks for the comments, I read other's guys threads here and I am stealing ideas, I hope this is not inappropriate. :-).
Something I forgot to mention is that at the one end of the bench ,that is at a lower lever is for the rotating axis.

[Nickhofen]

Any thoughts about the design and the dimensions of the steel tube I use?

[Clive S]

Any thoughts about the design and the dimensions of the steel tube I use?

I think 3mm is a bit thin for tapping into

[Nickhofen]

I think 3mm is a bit thin for tapping into

Hi Clive.
Nice input,thanks!
I will then go for 50x50x4, maybe?

Nick.

[Nr1madman]

Sorry I forgot to mention that the total height is 280mm.
I have read at another thread here , that to eliminate the forces when Z axis is cutting, the carriege must be at least at 250 mm from their outer sides.

Hello !
I think you (or me) has misunderstood..
The bearings on x axis your long axis should be wider preferably so that the tip of the cutter is between them when viewing the machine from the side.
The y axis bearings on gantry can be closer.

If you use 90x90x4 steel with no welding, how will you close the ends to be able to bolt there?

[Nickhofen]

Hello !
I think you (or me) has misunderstood..
The bearings on x axis your long axis should be wider preferably so that the tip of the cutter is between them when viewing the machine from the side.
The y axis bearings on gantry can be closer.

If you use 90x90x4 steel with no welding, how will you close the ends to be able to bolt there?

How close can be the bearings on the gantry so I can have good accuracy and eliminate the tolerance when torgue applied on Z axis ?
The ends of the tubes is going to be welded with steel flanges, I prefer minimum welding for minimum stress and to be able to adjust- align everything.