RE: [CAD_CAM_EDM_DRO] cnc/copy mill teach

Hi Steven,

Yes, it does take a lot of time to digitize to a fine grid. A course grid
would be faster, but it might miss some points.

The grid must be tailored to what you want to measure! An ideal way would
be to pick a set of points to look for and measure; that is, go to a
relative location on the periphery of a part, and take a measurement.
Probably how a feature a fancy CIM (? Computer aided measurement) system
would work. You'd have to know what you were measuring, and what "grid" was
needed where.

If the digitizing program is running under automatic control, then what's a
little time? Just experiment with grid size to get the detail in the
features.

A really smart program would take a coarse data set, and then allow you to
define detail in a series of little grids that matched the part to digitize.

Digitizing probes in CNC or (CIM?) programs can often be "jogged" to
features on the part to be digitized, and then coordinated recorded, faster
then reading and righting down coordinates (and less error prone).

Alan KM6VV

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Steve Haushahn
> Sent: Friday, September 09, 2005 2:27 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] cnc/copy mill teach
>
> Alan
> What you are describing is a bit like I been doing it ..I clamp part
> to table of conventional mill having digital readout and an edgefinder in
> the quill, then crank over to some important edges and note the DRO
> coordinates to add those recorded and measured radius to a handwritten G-
> code program..It is tedius...Sure a real digitizing probe would do for my
> work and I should have one .....But from what I've read other guys
> building their own probes , it sounds like it takes hours to digitize a
> small part.
> Steven
>
> HI Steven,
>
> Why not just use probe in conventional mill? Controller programs can do
> the
> digitizing. No need to build something special.
>
> However, for the more regular shapes, why not just measure and then draw
> them? The simple curves can be determined; the really complex stuff you
> could still digitize, or create your own from a few points.
>
> Alan KM6VV
>
>