The apron Following with the overhauling of the Leinen LZ4SB now the star is the apron. The Leinen apron is double walled and all the mechanisms run in an oil bath. It has an clever mechanism to stop the transversal and the longitudinal advances when there is too much torque. This allows to work with adjustable stops during automatic turning or facing operations. Power transmission between the feed bar and the apron is done through a worm drive placed inside the apron case.

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feb 21 we have been in Juncosa (Les Garrigues) to buy an old Uniz power hacksaw. It is a model 1 Uniz saw of 14 in built in the Basque country around the 60’s. The saw is really sturdy with a weight of more than 300 kg. It was kindly transported by my brother Jordi. I left here a couple of pictures of the machine just arrived:

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The factory pictures of the lathe show a tool tray and stand for the blueprints. We made a tray identical to the original. The work of steel sheet, for which we have no material or tools, was made by Lázaro Metalpress. The result, once painted is this: The tray was covered by a neoprene sheet of Plàstics Pujol.

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Altivar 312The lathe comes with an classical electromechanical wiring. It has an original Bauknecht 2 Kw and 3 speeds motor (720, 1450, 2880 rpm) . It was originally a 3 phase 220 V motor that in some moment was rewound to 380V. It has two speeds in a dahlander winding and an additional speed in an ordinary winding. Note how big and sturdy is the motor enclosure because of the number of speeds:

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The Leinen lathe comes with a two speed 1:1/1:8 reduction gearbox that can be operated while the machine is running. It works by using a multiple disks oil bath clutch. We disassembled the gearbox to check its condition. The reduction has a very thick deposit of oil after years without maintenance. Disks are in good condition and shaft seals are a bit worn. The following image shows the reduction set of parts after unassembling it.

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After being adjusted, the compound rest shows two issues: The motion screw exhibits a play that cannot be decreased. Provably the adjustable nut is severely worn. The crank has a fixed friction point when turning. No hints about the causes. The compound rest has been dismantled and thoughtfully cleaned. First it was necessary to make a special socket wrench for the adjusting nuts of the compound gib. Next picture shows the wrench.

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Let’s start by refurbishing the tailstock, which seems to be in pretty good condition. The tailstock is designed in such a way that its quill remains fully supported despite its position. It’s a typical construction of some precision machines. The tailstock is fixed to the bed using a lever that acts on a cam lock. The quill is locked by a usual half-moon clamps. The fit of the quill is very good, especially in the first part of the displacement.

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