Some days ago Sam Kowalski, a happy owner of a Boley-Leinen lathe asked me for the dimensions of the collet’s drawbar. He is posting some nice pictures of his lathe restoration in the Old Wood Working Machines forum. Sam, here you have a handmade sketch of the drawbar ;-). Don’t hesitate to ask for more details if needed. Beware that last informations about Boley Leinen collets for LZ4xx lathes tell that the threading is not M23x1 but a specific thread, say Z23x1, the profile of which is 55º instead of 60º of metric standard.

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Before and after Before: After: Some pictures of the lathe After more than a year of investing time in the great Boley-Leinen LZ4SB lathe, the following pictures show the result:

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The Leinen LZ4SB lathe cabinet has a drawer that is usually used to store the collets set. This requires to make a wood support to organize the set. I want also to store some usual tools: some live and dead centers and the wrenches needed to operate the lathe. I begin by cutting a couple of plywood pieces to the approximate size of the drawer. I glue them to obtain a thicker plywood support.

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The Leinen LZ4SB leadscrew is supported by two bearings. One of them, the corresponding to the adjusting end, has been eroded maybe for a deficient lubrication. This need to be faced again to recover the bearing surface. We plan to do that using a boring head on the milling machine. To support the part in an orthogonal position first an adjusting stud is turned in a lathe. This will guide the bearing when clamped to the table.

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The two speed driver of the lathe runs in an oil bath. Two plugs let to replace the oil when needed. We made two operations with them: Adding a neodymium magnet to the draining plug to let it to catch the debris. The magnet is a counterbored ring bought at Aimangz. The magnet was screwed to the internal part of the plug. The plus are in a difficult position to be tightened.

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