This is my first BUILD please help.

[DigiSoft]

It is around 100 Kg +-10

Tomorrow I'll make quality pictures and I'll take some pictures of few unmounted new parts.

[JAZZCNC]

It is around 100 Kg +-10

Tomorrow I'll make quality pictures and I'll take some pictures of few unmounted new parts.

So with Spindle and other attachments like X ballscrew mounts and cables etc you'll probably be pushing 120Kg+.?? . . .At this weight your going to have to be careful with motor tuning using slaved stepper motors. The inertia of this thing at higher feeds will try pushing like crazy so if your thinking to use machine for router type wood work then you may need to consider servo's.?

You'll certainly need to keep plenty of torque in reserve with slaved stepper motors otherwise your open to racking. What do you plan to use machine for.?

What pitch screws.?

[DigiSoft]

I have made a big progress with my CNC.
The worktable is finished and the construction is welded. It is night so I couldn't make better picture, but in few days I'll post more work progress. Everything is made of steal. Tubes are 80mm x 80mm x 4mm. The worktable is machined from steal.

Overall weight ~ 500KG

[EddyCurrent]

That is one hell of a substantial frame and bed, I can see why it weighs 500Kg, great job , pity the pigeon's have shit all down it though

[DigiSoft]

ahahahahahah it is not from pigeon. It rolled over on the concrete while we tried to turn it up side down :D

[DigiSoft]

I made a lot of progress.
Here are some pictures, I hope you like it.

[EddyCurrent]

Tidy job but the gantry and supported rails seem quite a bit less substantial than the base and bed, that's not to say it won't perform well.
Next you will have to skim the bed to make sure it's flat.

[Jonathan]

'Linear guide' is probably a better term to use than profile rail, to avoid confusion.
I agree that the machine is currently a bit mismatched - by far the lowest stiffness parts will be the round rails. Still, try it and see and if it does what you need then no matter...

[DigiSoft]

Yes I should have used 30mm rails but it would be to expensive so I used 20mm.

The profile under the rails is 140mm x 60mm x 5mm wall thickness.

Tomorrow I'll make new pictures.

Do you think I'll have problem with 20mm rails?

[EddyCurrent]

Please do not take my comments as critisism because your machine is excellent, it's just that for me there looks to be a mismatch between the gantry and bed frame.
Well I'm no expert on rails but from what I've read and found with my own machine I think you would have done better using the low profile rails such as Hiwin. Lots of people use the rails you have and they seem to work well but somehow they are not in keeping with that substantial base. Hiwin rails however would have been more expensive.
There 's one thing for sure though and that is the frame and bed will have enough stiffness.

As an experiment maybe you could add some test results to this thread ?
http://www.mycncuk.com/forums/gantry...cnc-mk3-2.html