This is my first BUILD please help.

[JAZZCNC]

Here is some progress i made so far. Everything is made of steel except the font panel of the Z axis, that is 20mm alu.
Please comment.

Nice Job and like colour it must be heavy thou with those big lumps of steel what weight is it.?

[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]

YES YES I will be using slaved steppers for X axis. 1 stepper at each side. I use 425Oz 3A NEMA 23 stepper motors. I bought 42V 750W / 15A PSU. I would like to be able to work on steel too. Do you think it would be possible?

Today I ordered steel working table. They will be making T slots in it. I have access to CNC shop with big cnc 2000mm x 2000mm working table. My table will be 1500 x 900mm and around 200KG.

The gantry complete like you said will be around 120kg.

I use RM1605 (5mm pitch / 16mm diameter).

I do not need fast machine. I just want to be stable and precise.

[JAZZCNC]

At lower feeds which you'll run for steel and aluminium you'll be probably be ok but they will struggle with higher feeds or heavy cutting conditions.
Personally I'd be looking into small servo's or at least Nema 34 motors and high voltage drives. Even small 400W servos will be fine has they give linear torque so won't restrict machine potential.

The 3Nm motors and low voltage you plan will be very limiting to machine performance has speed increases.! They should handle lower feeds ok but seems a shame to build what sounds like is going to be a very well built and sturdy machine and not be able to exploit it's full potential.!! . . . . That said they will get you started but think you'll probably quickly want to upgrade.

[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.