TC820si Gib Adjustment

Written By: Trent Plungas
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Difficulty

Moderate

Steps

5

Time Required

00:30:00 - 01:00:00

Sections

1

  1. The gibs are vital to the performance of your lathe. Gibs should be: flat, free of twist, free of burrs, free of blockages in the oil passages and channels. Defective or scarred gibs must be replaced.

    • The gibs are vital to the performance of your lathe. Gibs should be: flat, free of twist, free of burrs, free of blockages in the oil passages and channels. Defective or scarred gibs must be replaced.

    • Shimming of gibs will not yield acceptable results. It is good machining practice to avoid the use of shop air to clean the chips off a machine. This risks blowing chips into the sliding way surfaces and compromising the performance of the machine.

    • Because of long-term friction between the bed and carriage, wear may occur. Proper gib adjustment is necessary after the machine has been operated for a long time.

    • Gib adjustment screws are tightened to a specific torque by using the torque screwdriver or similar.

  2. Loosen both setting nuts. Adjust the gib by turning the adjustment screw using a flat head-torque screwdriver, and set torque at 1.2Nm (11 in-lbs). Move the X-axis a few times, and then go back to tighten the adjustment screws at 1.2Nm (11 in-lbs). Repeat this at least 2 times to make sure the gap between the gib and slideway are eliminated.

    • Loosen both setting nuts.

    • Adjust the gib by turning the adjustment screw using a flat head-torque screwdriver, and set torque at 1.2Nm (11 in-lbs).

    • Move the X-axis a few times, and then go back to tighten the adjustment screws at 1.2Nm (11 in-lbs). Repeat this at least 2 times to make sure the gap between the gib and slideway are eliminated.

  3. Turn the adjustment screw counterclockwise slowly until touching the gap on the upper edge. Use flathead screwdriver to fix the adjustment screw,(3 red photo) tighten the setting nut (2) first and then tighten the setting nut (1).

    • Turn the adjustment screw counterclockwise slowly until touching the gap on the upper edge.

    • Use flathead screwdriver to fix the adjustment screw,(3 red photo) tighten the setting nut (2) first and then tighten the setting nut (1).

  4. Loosen the gib setting screws (1) about 2 or 3 clockwise turns. (Do this on the left gib screw and right gib screw.) Use flat head-torque screwdriver, and set torque at 1.2Nm (11 in-lbs). Adjust the gib by turning the gib adjustment screws on the other side. Adjust the gib by turning the gib adjustment screws on the other side.

    • Loosen the gib setting screws (1) about 2 or 3 clockwise turns. (Do this on the left gib screw and right gib screw.)

    • Use flat head-torque screwdriver, and set torque at 1.2Nm (11 in-lbs). Adjust the gib by turning the gib adjustment screws on the other side.

    • Adjust the gib by turning the gib adjustment screws on the other side.

  5. Move the X-axis a few times, and then tighten the adjustment screws at 1.2Nm (11 in-lbs). Repeating this step at least 2 times to make sure the gap between the gib and slideway is eliminated. Checking if the setting screws are loosened. It’s correct if they are loosened. Then tighten the setting screws on both sides but not fully tightened. The gib might be out of shape if the setting screws are too tight. Checking if the setting screws are loosened. It’s correct if they are loosened. Then tighten the setting screws on both sides but not fully tightened. The gib might be out of shape if the setting screws are too tight.

    • Move the X-axis a few times, and then tighten the adjustment screws at 1.2Nm (11 in-lbs). Repeating this step at least 2 times to make sure the gap between the gib and slideway is eliminated.

    • Checking if the setting screws are loosened. It’s correct if they are loosened. Then tighten the setting screws on both sides but not fully tightened. The gib might be out of shape if the setting screws are too tight.

Finish Line

One other person completed this guide.

Author

Trent Plungas

Member since: 01/14/2021

64 Guides authored

Team

Siemens Internal Member of Siemens Internal

50 Members

28 Guides authored

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