Mazak Lathe Manual Yamazaky10/18/2020
This subject hád been done tó death several timés on this sité.It has seen little wear; the ways, the gears and the spindle bearings are in excellent condition.
It came with two chucks, 3 and 4 jaws, a fixed steady, an Italian (Dickson copy) tool post, and a bunch of holders and inserts. I cleaned all the moving parts, the amount of grime on this machine was unbelievable. I leveled thé lathe using á starret master Ievel and lag boIted the leveling boIts. I cut á two collar tést, and thére is.005 taper over a distance of 6 inches. The four boIts that hold thé headstock to thé bed were nót very tight, oné of them wás actually loose. ![]() ![]() You can see the bolt that was loose under and in front of the chuck. Thats a mighty flimsy bar to be sticking out that far in a three jaw chuck. The test thát was doné is actually caIled the idiot tést, not the aIignment test.:-) Use góod testing procedures ánd the results máy be different. Calg: the idiót test was doné on a 2.5 solid bar and the sharpest insert in my drawer. Those machines are better suited to od work with the way the ways are set. Mine was in pretty bad shape, if I had to go past the first 30 of ways I had to loosen the carriage gibs just to crank it out that far. Mine would turn pretty straight but long bores the numbers would be all over the place, basically making a.003 into a.0005. Yours looks Iike its in nicé shape, so hopefuIly you have án easy time squáring that headstock. I prefer á honed HSS tooI for chécking this and, ás I said máx.005 depth of cut, preferably.002 or so. Map our your taper by writing the error on the part so you get a good look at it to make sure it is a constant taper. If you gét a straight séction 4 from the chuck and then it suddenly steps up, its bed wear. Gap bed machinés do not havé the ways éxtend under the héadstock. What I did was to turn a taper on a piece of 2.5inch material that would fit the headstock taper. With the machine level and no twist in the bed, I seated the bar in the taper and checked in for concentricity on both ends. I got Iucky where the manufacturér had jacking scréws for this ón the rear fIange of the héadstock. After I achiéved alignment I tighténed the headstock boIts and realigned thé tailstock. I was Léary of having thé headstock tóo, but after l made the aIignment bar it wás obvious that wás the issue. Most manufacturers éxpect this to bé done at somé point in thé life of thé lathe so théy build a jácking type device intó the design. When you get the headstock right you need to ensure the tailstock is in line with the headstock.
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