8 x 4 build

[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.

[kingcreaky]

i used rotating nuts, on my 8x4 build because of the whip effect Clive mentions.


skip to about 1:15


http://www.mycncuk.com/threads/8242-...t=wall+mounted

[reefy86]

thanks guys i will take a look :)