8 x 4 build

[reefy86]

thanks lee

[reefy86]

just throwing in my gantry design, the z axis is inside the x axis frame which is supported by 2 200x100mm 10mm thick mild steel box, the z axis has a maximum height of 250mm (would like to go higher but 250mm seems to be the recommended height for rigid and stability.)

what do you think?

cheers

ash

[Clive S]

Are you going to use screws at that length ? driven with a motor on the end.

[reefy86]

do you mean ball screws? if so then yes both sides :) using nema 34 motors and servo drivers.

cheers

ash

[D.C.]

Have you a read through this build log? Lots of renderings at the start and photos of the frame later on that might help.

http://www.mycncuk.com/threads/6619-...2060#post52060

[Clive S]

do you mean ball screws? if so then yes both sides :) using nema 34 motors and servo drivers.

cheers

ash

Ok then have factored in the whip of the screws at that length etc.

[reefy86]

hi clive, what do you mean have factored in the whip?

cheers

[Clive S]

hi clive, what do you mean have factored in the whip?

cheers

Ball screws have a critical speed that you can reach before they start to whip I am not an expert on this but I would have thought that if you are using screws that long you might need rotating ball nuts. Do a search on here there has been plenty of talk about it.