Re: [CAD_CAM_EDM_DRO] Re: Climb Milling

Hugh,
The normal thing (for me anyway) is to adjust the table and saddle gibs
to provide the needed drag to prevent "snatching" under normal to medium
heavy climb milling. This will have to be determined by your experience
and trial and error. The table locks should not be used for drag too
often, as this will wear the gib unevenly at this spot as well as the
dovetail over this area. The slides should be easy to move but, not so
easy that you can shove the slide by hand without some real effort.
It all depends on the type of work you do and adjust accordingly.
No one adjustment will work for all and ever jobs.
RichD

Hugh Currin wrote:

>
> Jon (and all):
>
> Can you put a little added friction on the table via the table locks? If
> the friction is enough to avoid the tool forces "slamming" the table
> through any backlash, climb cutting should be OK?
>
> I take light cuts (I get scared otherwise) and have infrequently run into
> this problem with climb milling. I do avoid climbing with heavier cuts
> though. After installing ball screws I have some +-.001 backlash and
> haven't had trouble. But not much machining time with this new
> setup. Climb cutting feels less scary with ball screws but it could be my
> imagination. :-)
>
> I suspect this problem of "slamming" through the backlash is more a problem
> with CNC where you're doing more motion changes and are more removed from
> the process?
>
> Hugh Currin
> Klamath Falls, OR
>
> At 06:35 PM 6/5/01 +0000, Jon wrote:
>
> >Well, the backlash compensation, in itself, won't interfere, but if you
> >try to climb mill on heavier cuts, with a machine that has appreciable
> >backlash, you will likely have a crash. It is the backlash, not the
> >compensation, that is the real problem.
>
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