Re: Ballscrew lead question

Les,

I guess that was a silly question. It's all just numbers to the
computer, right? It must just round them off at some point and move
on.

What's the problem with inch threads anyway? When I need to check the
thread depth of a 1/2"-13 hole, I simply count the turns and multiply
by 0.0769230769230769230769230769230769. Seems perfectly reasonable to
me ;)

Just kidding, I would round that off myself, as I suppose the computer
will.

Thanks - time to shop for ballscrews!

David



--- In CAD_CAM_EDM_DRO@yahoogroups.com, Les Newell <lesnewell@f...>
wrote:

> Hi David,
>
> The pitch of the ballscrews has little effect on their accuracy.
> Acccuracy is dependent on how accurately they are machined. Backlash
> does tend to increase slightly when you get to the really coarse

pitches

> like 1TPI and less.
>
> Metric pitches aren't odd - those strange inch pitches, now they are

odd

> ;-). It actually makes no difference to TurboCNC,EMC, Mach2, DeskCNC

etc

> if your screws are metric or inch. They all generate a scale factor

that

> translates your machining units to steps. This scale factor is only
> calculated when you are setting up so it makes no difference when

you

> are cutting.
>
> Les
>