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Incorrect turning pitch and its solution | Wood Turning Machine

Incorrect turning pitch and its solution | Wood Turning Machine

03 Dec 2021

Fault analysis: the thread is incorrect in full length or partly, the pitch is uneven on the full length of the thread, or the slub pattern appears on the thread.
Solution:
1. The overall length of the thread is incorrect: the reason is improper matching of the change wheel or the wrong position of the feed box handle. You can recheck the position of the feed box handle or check the hanging wheel.
2. Partially incorrect: The reason is the partial error of the screw pitch of the lathe screw itself (generally caused by wear), the screw can be replaced or partially repaired.
3. Uneven pitch on the full length of the thread: the reason is: the axial movement of the lead screw, the axial movement of the spindle, the opening and closing nut of the slide box and the lead screw are different axis, resulting in poor meshing, and the slide box dovetail Wear of the guide rail causes the opening and closing nut to be unstable when closing, and the hanging wheel gap is too large. Pass detection: If it is caused by the axial movement of the screw, the adjustment round nut at the connection between the screw of the lathe and the feed box can be adjusted to eliminate the axial gap of the thrust ball bearing at the connection. If it is caused by the axial movement of the main shaft, adjust the nut after the main shaft to eliminate the axial clearance of the rear thrust ball bearing. If it is caused by the poor meshing caused by the different axis of the opening and closing nut of the slide box and the lead screw, the opening and closing nut can be trimmed and the opening and closing nut gap can be adjusted. If the dovetail rail is worn, dovetail rails and inserts can be prepared to meet the correct matching requirements. If the gap between the hanging wheels is too large, readjust the gap between the hanging wheels.
4. The slub pattern appears: the reason is that the gear transmission from the main shaft to the lead screw has a cycle* error, such as the gear in the gear box, the gear in the feed box due to its own manufacturing error, or partial wear, or The eccentric installation of the gear on the shaft causes the rotation center to be low, which causes the screw rotation cycle* to be uneven, and the driving cycle* to move is uneven, resulting in the appearance of slub patterns, and the gears with errors or wear can be replaced.
Wood Turning Machine