Sturdy and Fast all Steel CNC , my first build

[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 .!!!

[IanS1]

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

Are you taking orders for it yet?

[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

[Boyan Silyavski]

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

Hi Adrian,
i couldn't help but notice, your gantry is only supported by 1 side plates at each end? Wouldn't it need something stronger, like my design? As profile like support at the sides is stronger from even a thick plate i believe. There is a calculator Excel sheet somewhere here on the forum.

Your table structure looks great, and i have given a lot of thought how to make gantry similar to yours, it looks great also.

[HoGo]

The gantry sits directly on the 20mm plates that will hold the rotary nuts, to which another 22mm thick plates with cars will be mounted. There's no gap there. The sides are 12mm thick steel. So there is direct contact of bottom of gantry ends to rail cars. There is no measurable side to side movement possible other than any play in the rails/cars.
I used 100x100x10 SHS for most of the construction as I had to order two 6m lengths and didn't want to throw away too much. Also one 6m length of 140x80x7 was used for gantry and for two table supports, all was used up almost without waste (supports intentionally placed along the table to create space for extra long 4th axis as we'd like to make some gunstocks in the future).
Adrian

[Boyan Silyavski]

The gantry sits directly on the 20mm plates that will hold the rotary nuts, to which another 22mm thick plates with cars will be mounted. There's no gap there. The sides are 12mm thick steel. So there is direct contact of bottom of gantry ends to rail cars. There is no measurable side to side movement possible other than any play in the rails/cars.
I used 100x100x10 SHS for most of the construction as I had to order two 6m lengths and didn't want to throw away too much. Also one 6m length of 140x80x7 was used for gantry and for two table supports, all was used up almost without waste (supports intentionally placed along the table to create space for extra long 4th axis as we'd like to make some gunstocks in the future).
Adrian

Thanks Adrian! Now i get it. Its not raised. Same with me. Have to think in 6m lengths :-) .