I have a colchester Triumph 2000 lathe that I would really like to get to turn straight. I have used a machine level to equal out everything, but the machine keeps on turning about 0,3 mm 'cones' when I foreksample bore a cylindrical piece that is 120 mm long. Has anybody an idea of or a guideline on how to make it turn 100 procent straight, or is that to much to ask for an old machine like this one? I would like to be able to bore single cylinders for harleys and boxer engines, I have a sunnen hone to make the final cross hatsh pattern. Fiat Brava 2002 Service Manual. But how straight do the cylinder actually have to be, before honing.
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And what would the final tollerance be on a 103 mm cylinder foreksample? Here im not thinking roundness witch offcourse should be 100 procent, but is it a problem if the cylinder is 0.2 mm smaller/bigger in one of the ends?? And yes I assume it is, but what is the tollerance? Thanks for a great forum, I love reading threads in here.
Best Regards, Jakob. Try here:-, links at bottom of page. Download the earlier model (with footbrake) manual and the adjustment procedure is on page 17 of the PDF. I doubt if its as easy as it is made to sound! Dunno if you have any experience in this sort of adjustment, if not the following notes may help.
As there are no calibrations you may find it helpful to make some measurements and figure out how much movement per turn of adjuster you should expect. If you have a dial gauge or three about the place arrange it/them to show the movement, if any, on the head stock as you adjust. Hard enough to get at those adjusters let alone feel exactly what's going on. Probably get best, and most stable, results if you can arrange for the final adjustment to be by a definite movement rather than trying to sneak up on it half a tenth at a time. Which really needs an indicator.
If you turn up a decent length of bar to the machines 'natural' taper before starting adjustment and leave it mounted you can indicate off that taper to track the process. Once you have halved the error things should be close. If the pivot pin is loose or, worse has been removed, the adjustments won't behave so if it goes berserk that's one thing to check. Took me a long time (months) to twig there were pin problems on a similar set up on a piece of optical lab gear.
Sometimes it just won't go today and you keep dancing around the target. If that happens don't force it, give it a rest and come back tomorrow.