Re: Ball/acme screw question

--- In CAD_CAM_EDM_DRO@y..., "JJ" <jj5412@e...> wrote:

> (Hoping this is on topic)
>
> In my quest for constant upgrades to my CNC mill/router/pcb thing, I
> have a couple of questions:
>
> Why would you choose a multistart screw over a single start screw?
>
> Are acme thread screws more efficient that generic threaded rod?
>
> ADVthanksANCE,
> JJ
>
> Be Kind, Be Careful, Be Yourself

multistart screws are usedfull in situations where the threadprofile
will be smaller then the pitch of the screw.
for example a 1. wide nut with a 1. pitch screw would allow only
1 thread to be engaged this makes for a low loadbearing on the screw.
multysthreading of this screw would add another thread of loadbearing
capabilitie for every thread added.
Add as many threads as there is room for them without overlaping.

the efficency of Different threadprofiles
depends on there intended use.
example:
Acme/ballscrew = in motion application
sawtooth = one directional loadbearing
roundtooth = in motion in contaminated environments
there are many more possibles for me to list but you
get the idee here.
different designs favor different operating conditions.