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Axial Threading Seminar

Eventually parts of the rolling head and rolls will wear, causing problems obtaining acceptable threads, such as;

A.	Holes in front plate become out of round.
B.	Incline surfaces of the front and center plate wear and create groves #3 & #4.
C.	Eccentric Spindles #5, both the surfaces supporting the thread rolls and the OD of the surface that extends through the front plate.
D.	The mating surface of the dog clutch that holds the head closed causing premature head opening.
E.	Teeth on #8 spur gear and #7 center gear wears and chips.
F.	Coil spring #10 loses tension and becomes too weak to open and close head correctly.
G.	Spur gear not correctly positioned with center gear will cause? (figure 5)

The tooth (normally it is marked) bisects the ID flat on #8 Spur Gears must be the tooth that contacts the #7 Center Gear as shown. This correctly positions the #5 Eccentric Shafts.
Figure 5

H.	Roll cage assembled so eccentric spindle closes rolls instead of opening them.
I.	Misalignment, by far the most commonly faced problem. This is caused by wear in the rolling head or wear in the machine tool. Wear in the head could be caused by some of the items already mentioned or a misalignment due to a badly worn and bent shank on the head. Wear in the machine tool is caused by wear on the slides and in the holes that hold the rolling head shank.
J.	Checking for misalignment; Remove the rolling head from the machine and replace it with a ground stock mounted in the same hole that held the head. It must protrude as far out of the holder as did the head. Clamp a dial indicator and check for run out while slowly rotating the ground stock from front to back. Tolerance to maintain should not exceed .004.

Additional Seminar Information

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