Grizzly g0748, g0747 Adjusting Gibs, Saddle gib and adjustment screw Knee Gib Adjustment Screw

Adjusting Gibs

Gibs are tapered lengths of metal that are sand- wiched between two moving surfaces. Gibs con- trol the gap between these surfaces and how they slide past one another. Correctly adjusting the gibs is critical to producing good milling results.

Tight gibs make table movement more accurate but stiff. Loose gibs make moving the table sloppy but easier to do. The goal of gib adjustment is to remove unnecessary sloppiness without causing the ways to bind.

Gibs are adjusted with a screw on each end of the gib, that move the tapered gib back-and-forth to increase or decrease the friction pressure between the sliding surfaces. The process of properly adjusting the gibs requires trial-and-error and patience.

DIsCONneCT MILl FROM POWER BEFORe ADJUsting THe GIBS!

Make sure all table and knee locks are loose. Then, loosen one gib adjustment screw and tighten the other the same amount to move the gib. Use the ball handles/crank to move the table/ knee until you feel a slight drag in that path of movement.

Refer to Figures 62–64to identify the locations of the table, saddle, and knee gibs, and one of the two adjustment screws for each.

Note: It will be necessary to remove small parts, such as way wipers and covers, to access the gib adjustment screws.

Model G0747/G0748 (Mfg. Since 8/12)

Table Gib &

Adjustment Screw

Figure 62. Table gib and adjustment screw

underneath left side of table.

Saddle Gib &

Adjustment Screw

Figure 63. Saddle gib and adjustment screw.

Knee Gib &

Adjustment Screw

Figure 64. Knee gib and adjustment screw.

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