Sturdy and Fast all Steel CNC , my first build

[Boyan Silyavski]

The frame looks good.

The welds look fine considering you've not ground the mill scale of before hand. Although MIG welding will burn through the scale, it can lead to weld contamination as standard MIG welding can only burn of a limited amount of contamination.

Thanks for the heads up. next time will not only grind 1mm the corners but as you say.

Here are 2 recent pictures. Just soldered the hardstops for the gantry from 100 UPN profile. My friend insisted on soldering 4 short legs, again from UPN100 profile. Strengthwise i would have soldered 6 legs instead of 4, or none at all and lay the machine and thin layer cement the machine on place but i was very curious of the deflection of my design.

Now just measured it so here is the result:

1. Applying 100kg static force/me/ on any one of the bead beams leads to 0.045 mm deflection in the middle
2. Applying the same 100kg to middle of the raised sides supported only at both sides by 9 cm legs from 100UPN profile leads to 0.03mm deflection on that side.

Conclusion: With gantry and bead mounted in real working conditions the overall vertical deflection of the machine will be unmeasurable or less than 0.01mm which is irrelevant especially with 0.8kw spindle. So first impressions are perfect.

Anyways, i will most possibly insert pads in the middle of the machine when placing it on its place, so it will stay rigid and quiet

PS. In fact using the excel file for calculating deflection on gantry and gantry side, i guess the real final value of deflection in all directions of this particular design of the finished machine will be 0.0035mm. Which i believe is great.