Re: Conversion Of Mill to CNC (LONG)

John,

Absolutely right. My dumb mistake.

Mariss

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "John Craddock"
<John.Craddock@x> wrote:

> Mariss
> Are you sure you don't divide by the efficiency? Formula below

gives smaller motor for less efficient lead screw.

> John C
> -----Original Message-----
> From: Mariss Freimanis [mailto:mariss92705@y...]
> Sent: Saturday, 10 May 2003 10:28 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: Conversion Of Mill to CNC (LONG)
>
>
> (2) in-oz = (2.55 * Lbs * eff) / TPI where TPI is turns per inch

and

> eff is the screw efficiency. Use .3 for a really crummy ACME screw
> and .95 for a really fine ball screw.