Stell frame cnc 1500X1000. Adjustable table your opinion please

[ba99297]

Hi guys here is some progress

My basic question if this arrangement is suitable for such a machine
The green colour is 1,5 cm aluminium and all the others steel.
The rectangular tube is 120X60
At the beginning i was planning to use 3 120X60 rectangular box tubes in order to make a C shape gantry but finally i change the plans
I will also like to hear your opinion about the way i attached vertical pieces of the side parts of the gantry to the horizontal parts
Finally i would like to know if it is better to bolt or to weld the rectangular tubes to the sides of the gantry

Thanks for your time

Vagelis

[JAZZCNC]

Hi Vagelis,

My basic question if this arrangement is suitable for such a machine

This design will be fine I've use a very similair design on machines but with all aluminium construction.

I will also like to hear your opinion about the way i attached vertical pieces of the side parts of the gantry to the horizontal parts.
Finally i would like to know if it is better to bolt or to weld the rectangular tubes to the sides of the gantry

The arrangement of vertical and horizontal looks ok but with the lower Horizontal base plate you may want to think about how your going to attach to the X axis ballscrews.? It may be better to have the lower plate extend out the side and attach screws to it's under side.?

Regards welding or bolting then NO I wouldnt weld it has you'll have very little room for adjustment. I've said it many times but I'll repeat because it's so important to a Good DIY machine.!!. . . . .ADJUSTMENT ADJUSTMENT ADJUSTMENT . . . . Welding solid is OK for some areas like the frame but for a Gantry then I'd only weld the minimum if at all.!

Also realise because your planning to use Steel for the Gantry sides and base plate it will twist and warp while welding so you'll need to machine the lower face of the Base plate which sits on the Linear bearings. For this reason I wouldn't Use Steel in this area and have Aluminium gantry sides/base plates and bolt together. Still use Steel for the cross beams just bolt it all together.

I would also have 2x brace supports between top & bottom cross beams across the width at the rear. This will help reduce resonance.