Stell frame cnc 1500X1000. Adjustable table your opinion please

[ba99297]

Hello everybody. I came back to show my little progress.
I want to remind everyone that we are talking about a cnc router with

X 1800mm
Y 1000mm
Z:300mm

It will be moved with 4 ( 2 x axis, 1 Y axis, 1 Z axis ) 400 watt yaskawa servo sigma II.
Steel is the basic material for the construction ( except z axis that I didn’t design yet )
As the table has been discussed many times, I have nothing to say. I just upload two photos . Basic beam is 80X80X4 mm.



The gantry will be maid from two 120X60 X ( 3mm or 4mm thick steel ). At the end of the gantry frame, 8mm and 10mm steel plates will be welded in order to reinforce the gantry attachment to the side braces that will be bolted on the carriages.





If it will be needed ( I try to avoid it ) the front face and the side (left-right ) faces will be perfectly milled to be vertical each other.

Here I want your opinion about the way I laser cut the steel plate and the way I try to keep everything square in order to avoid (if possible) machining cost. If you notice the plates has been cut in such a way ( like a puzzle ) that it is difficult to distort when I will weld them ( I am planning to tig weld the parts in order to reduce heat distortion). Do you think this trick ( “ puzzle cut “ ) will work ?



The same way I made the side braces here are some photos.





If you notice the side braces have straight slots in order to fine tune the gantry so I will be parallel to the cutting surface.



At the following photo you can see two holes where I will bolt screws that will help me to adjust gantry height.



Also the straight slots ( on the vertical piece of the side braces ) will allow small ( up-down ) movements. Side braces and gantry frame will be bolted together.



As for the ball screw mounts, they are also adjustable.


I want your comments if you wish , an I remind you my basic questions

1. Is the gantry overbuild?
2. Is 10mm steel ( for gantry side braces, front face, and side reinforcing )too much for such a construction or should I go with 8mm 7mm or 6mm. I am asking because if we follow the 1:3 relation between steel and aluminum, 10mm steel equals to 30mm aluminum )
3. Will the puzzle cut technique work?

As for the weight the gantry without the motor that will move y axis and without the ballscrew and of course Z axis, weights nearly 41 kgr ( with 10mm thick steel for the side braces and 8mm steel for the reinforce angles and 4mm 120X60 rectangular beam). If I reduce steel thickness and remove steel from some no critical spots, it is obvious that 41 will be easily reduced to 35 or less.


Thanks for your time

Vagelis

Ps: I will use 1:2 gearing but at the above plans i use 100mm 60 tooth diameter for the ballscrew pulley ( that will give me 1:3 gearing, having in mind that the motor pulley is nearly 3,6mm 20 tooth) in order not to have dimension issues if in the future i want to go with 1:3 gearing.