Mill 480x500x180 RIGID

[JAZZCNC]

Thats looking excellent and will be a very strong capable machine. Only thing I see that you dont show is any scope for adjustment between the moving table rails and the gantry upright rails.? (Or is that why the moving table frame is blue.?) They need to be perfectly perpendicular to each other.!

You wont easily achive this welding the frame so you need some form of adjustment building into the machine. !! PLENTY OF ADJUSTMENT IS THE KEY TO GOOD DIY BUILD.!! . . . I say this in CAPITALS because it's often missed and then regreted later.

[toomast]

The blue frame is separate from main frame and therefore adjustable. For now I`m not sure how the adjustment and rigid fixating of the bed frame will look like...

Welding the big frame together will take some time but. Wonder if there is any point creating subassemblys and bolt them together?...there is not any adjustment needed if I epoxy level gantry upright rails and bed frame is adjustable. It will be heavy fo sure.

[toomast]

In search of a better/simpler/cheaper design I have come up with these versions. As pictures illustrate I did not succeed.





For the time being this fixed gantry design will come to a halt. As I have a need for larger work area and more general machine. Probably will go with something similar to Syliavski`s design.
This project is published in https://grabcad.com/library/fixed-ga...nc-460x500mm-1
Thanks for listnening!

[Robin Hewitt]

It still looks a tadge wrong to me...

I thought the big advantage of the fixed gantry was that you could localise the support for the bed where it was needed. You put your rails on the bottom of the bed and your linear blocks under the gantry. There is no point in supporting the bed anywhere but under the gantry, you are just introducing unnecessary overhangs

The machine should appear as a gantry with a bed sliding through it

[toomast]

It still looks a tadge wrong to me...

I thought the big advantage of the fixed gantry was that you could localise the support for the bed where it was needed. You put your rails on the bottom of the bed and your linear blocks under the gantry. There is no point in supporting the bed anywhere but under the gantry, you are just introducing unnecessary overhangs

The machine should appear as a gantry with a bed sliding through it

It is not perfect :)
I don't quite follow you though.
Do you mean fixing HIWIN rails to moving bed and bearing blocks to main frame?

[Robin Hewitt]

Correct. You can remove a lot of unnecessary iron and make it stronger.

Remove the overhangs and put the support where it is needed.