Sturdy and Fast all Steel CNC , my first build

[JAZZCNC]

Erm.!!! . . . Arturo's stuff is ok but it's no where near has good or well built has PMDX boards.!

[Boyan Silyavski]

Erm.!!! . . . Arturo's stuff is ok but it's no where near has good or well built has PMDX boards.!

He he he, maybe not but i have been with faulty breakout board and had to wait a month for an exchange. The easily removable IC is a feature that living here in Spain is a must.
the local electronic genius has work for 3 months ahead. And i am not into electronics repair really. Sometimes simpler is better.

[Boyan Silyavski]

Today after whole day drawing, considering, redrawing, considering... designed the ball screw assembly on Y/ the long axis that moves the gantry/.

I wanted it sturdy, compact, at the right place and most of all easy to rectify and assemble. Following step by step. Still have not figured the belt length, so a minor correction maybe tomorrow. Other challenge was how to keep the working distance at maximum and at the same time ball screw length minimal.

Designed the hard stops with threaded holes for proximity sensors. A bit overbuild but for sure there will be crashes as the guy is a new to CNC.

Some pictures. Have to finish the design this weekend in order to buy the rails, ball screws and order the laser cut pieces.

[Robin Hewitt]

I don't really understand why the spindle motor is sitting so far below the gantry?

The maximum depth of cut is usually the longest tool that you can fit.

If this to engrave the top of a large object, to clear hold down fixings or what?

[CraftyGeek]

Isn't it more a case of the gantry being positioned high, rather than the spindle being low?
If the bottom of the gantry was level with the top of the x-axis it wouldn't be anywhere near as bad?

[Boyan Silyavski]

Hi,

as i mentioned before but maybe you missed it, this machine exclusively will be used for 3D jobs most of them in the 140mm-170mm height region. Not for lettering, woodworking or similar.

The guy is doing model yacht building. So shapes would be very strange
So the Z that enters the zone below the gantry should be thin, as not to touch the other parts of the model while the bit is routing deep below hollowing something.

Check my picture and will see for yourself what i mean. Its a specific 3D job machine. I don't believe that reinforced 20mm steel plate for the spindle with 10mm ribs is flimsy as you suggest.

If you have any other ideas i am open to suggestions. Point me to a better solution and i will change the design.

[Gytis]

in my opinion with so wide Z axis plates you just wasting a lot of material and travel in Y axis direction.,
with 20mm profiled rails you can do Z axis on 160mm wide plate, and extend travel in Y direction, or just save matirial in all you built.

[masinecc]

Hi dear friends, do u thing its good ide to use ballscrews RM2505-L=2600mm on both sides of my y-axis. Could it be too long and cause vibrations ? Or should i use R and G instead?

[Clive S]

Hi dear friends, do u thing its good ide to use ballscrews RM2505-L=2600mm on both sides of my y-axis. Could it be too long and cause vibrations ? Or should i use R and G instead?

Welcome to the forum. It would be better if you started a new thread with this.

You could use rotating ball nuts so that the screws remained static. ..Clive

[masinecc]

Thanks for ur reply, would u like to post a picture from that rotating ball nut? Just to see how does it look like. Thanks !