4' x 4' x 8" Router Build

**JonnyFive** · 17-10-2019

RouterCNC - thanks for taking the time to explain all that, I appreciate it. I've had a bit of a play with your stiffness calculator spreadsheet and I'm getting gantry deflection of <0.05mm as I would expect following Jazz's advice.

I think I'm going to redo my frame design using 60x60x5 for the legs, 120x60x5 for the rail supports and maybe use 50x50x4 for the bed and triangulation / stiffeners.

**JAZZCNC** · 17-10-2019

Originally Posted by JonnyFive

I think I'm going to redo my frame design using 60x60x5 for the legs, 120x60x5 for the rail supports and maybe use 50x50x4 for the bed and triangulation / stiffeners.

I wouldn't take that route as the difference in steel price won't be massive. It will make welding more difficult because of your mixing different thicknesses and tube sizes.
At this width, the bed will be much less resonant with the thicker, wider tube size giving a better finish on parts. Esp when cutting harder materials that will resonate into the bed and frame.

Keep in mind it's the foundation of the whole machine. It really isn't worth spoiling the broth for apeth of salt.

**Kitwn** · 18-10-2019

Originally Posted by JAZZCNC

It really isn't worth spoiling the broth for apeth of salt.

Where's yer grammar lad? "It in't worth spoilin' t' broth for an ha'p'orth o' salt"
.

**JAZZCNC** · 18-10-2019

Originally Posted by Kitwn

Where's yer grammar lad? "It in't worth spoilin' t' broth for an ha'p'orth o' salt"
.

Tha's reight old lad, cummin from't God's own country a shuda known bet'ta, but think tha'll fi'nd it's spelt ha'peth.!!. . . . cos we'll av non that posh "orth" rarynd here si'thi.

**Kitwn** · 19-10-2019

Originally Posted by JAZZCNC

Tha's reight old lad, cummin from't God's own country a shuda known bet'ta, but think tha'll fi'nd it's spelt ha'peth.!!. . . . cos we'll av non that posh "orth" rarynd here si'thi.

My dad was pure-bred Yorkshire (though he was born in Karachi, only because his mother was there at the time) but was educated at Cambridge so the odd posh turn of phrase was known to escape his lips. Not often, mind!

Kit