Sturdy and Fast all Steel CNC , my first build

[Boyan Silyavski]

Everything ordered including the steel for the structure. Still have not ordered the laser cut parts. Untill i have the rails and ball screws at hand.

And here comes the first major problem. The place where i found the 140x80 profile for the gantry refuses to sell me 1m even they have promised me before. . Now i have to buy 6m , or change the design.

At the other place where i would buy the rest of the steel, i found some pieces of 100x100x4 box profile. And generally they will sell me everything cheaper and help me in their machine shop. So now i am contemplating soldering 2 pieces of 100x100 and making the gantry 100x200mm. That would change the design of the gantry widening 2cm, one at each side and making it higher by 6 cm.

What is your opinion about this change? The ball screws will be further 2 cm from the z plate. And the upper bearing slides and rail will go 6 cm higher.

[Boyan Silyavski]

No body says nothing, may be the thread is not so interesting as it seems to me or i am doing it right

Soon will make it more interesting with pictures of the process. Now everything is ordered including the steel profile. Will have to pick it tomorrow and solder it this weekend.

At the end i used only 100x100x3mm steel box for everything. The 4mm seemed very heavy and overkill for the 0.8kw spindle .
I still have doubts for the threads on the rails so most possibly will solder additional plates for the threads of the rails. Anyways they will be covered by epoxy.


Here is the final design , its lighter and stronger than the 60x60x4 and also another point is that less cutting and soldering is needed.

400x1000 x Z 170/up to 200/ working area, gantry ~35-40kg with everything mounted, profile structure and gantry with plates = ~ 100kg

[WandrinAndy]

No body says nothing, may be the thread is not so interesting as it seems to me or i am doing it right

Hi silyavski,
There may be another explanation and that is maybe something wrong with the forum...... I have been lurking recently and don't recall your post #25? Although individual posts may sometimes get lost in a rush of posts!
Cheers,
Andy

[JAZZCNC]

No body says nothing, may be the thread is not so interesting as it seems to me or i am doing it right :hysterical

I didn't see these post's either.!

Anyway it's looking good. The 3mm wall thickness will be fine for the rails holes but don't drill them until you have epoxy on the rails. If you do it before then you'll create your self more work.

[HoGo]

This provoked my first post here...
I'm in the middle of my own build (quite similar to yours) and I'm using 100x100x10 so I'd throw in a few words... Don't overlook the edge radius of your SHS. I got unpleasantly surprised when I was supplied with 100x100 SHS that has 35mm (or perhaps even more) diameter at edges... I was counting with 25mm diameter I found in tables of SHS somewhere but the supplied steel was cold rolled with much larger edge radius. My rails will be right at the edge of square so I added thick plate on top of SHS to support the rails. You may not have this problem with 3mm wall but I'd check at the supplier and verify the design with that in mind.
Good luck!
Adrian

[JAZZCNC]

Don't overlook the edge radius of your SHS. I got unpleasantly surprised when I was supplied with 100x100 SHS that has 35mm (or perhaps even more) diameter at edges... I was counting with 25mm diameter I found in tables of SHS somewhere but the supplied steel was cold rolled with much larger edge radius.

That 35mm is very large Diameter and your correct it should be more like 25mm, I have some 200x100x10 here and that is only 22mm Dia. I would have took it back.!!

The Dia on 100 x 100 x 3 will be roughly 8mm, I've got some 150 x 150 x 5 here and the Dia is 12-14mm.

[Boyan Silyavski]

Thanks for the advice. I just came from the metal shop, but they still have not cut it. However the profile seemed normal squarish, nothing unusual, so i believe that will not be a problem.

I wonder guys what are you constructing with 100x100x10 ?

[JAZZCNC]

I wonder guys what are you constructing with 100x100x10 ?

My case It's actually 200x100x10 with front face ground for rails and it will be Fixed gantry for my new DIY-VMC .!!!

[HoGo]

I wonder guys what are you constructing with 100x100x10 ?

This:

Actually the table and gantry are welded and waiting for milling for rails. So far we are at roughly 400kg, finished machine will be just hair under 600kgs.
Adrian