Re: Setting Lathe or Mill Gibs

gib adj that has worked well for me without using any gauges is
tighten until snug then back off 1/8 turn which works on most
machines.

Harko

On 2/27/06, BobWarfield <bob@...> wrote:
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@...> wrote:
> >
> > kiwiavi wrote:
> >
> > >Hi Is there a more scientific way to set gibs other than "when it
> > >slides freely"
> > >
>
> Here are two more "scientific" ways of adjusting your gibs that I
> have come across in my travels. I have not tried either, but the
> sources were good. Your mileage may vary.
>
> CNC Adjustment
> ===============
>
> CNC machines make gib adjustment a little more difficult. Without
> handwheels, you can't really feel how tight they are. Commercial
> CNC machines make the adjustment by measurement how much amperage is
> drawn by the motor during traversal. One account I read indicated
> it should be about 30% to 50% of the maximum rated amperage for the
> motor.
>
> Bridgeport Factory Adjustment
> =============================
>
> This is supposedly the factory procedure used by Bridgeport to set
> the gibs. Use a 0.0001 reading indicator and measure the slop in
> the slide. Example: For the X axis, place the mag base on the end of
> the saddle and put the stylus on the table. At that end of the table
> push and release. Then pull and release. The differance is the
> amount of clearance in the slide. Repeat at the other end of the
> saddle. Adjust gib in a like new machine with little wear to give a
> reading of 0.0005. A machine with more wear will have to be checked
> with the table closer to the end of travel. The same procedure is
> used to set the saddle to knee gib. There must be some clearance for
> the oil film and that film also helps dampen vibration. On a machine
> with hardened and ground box ways and turcite on the moving member
> the procedure is to set the clearance to almost nil. 0.0001 is a
> good number.
>
> For a mill that isn't as well made or in as good condition as a new
> Bridgeport being adjusted by the factory, its hard to say.
>
> Enjoy!
>
> BW
>
>
>
>
>
>
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