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  1. #76
    Join Date
    Sep 2008
    Location
    Sydney
    Posts
    27

    Default

    Quote Originally Posted by morrisman View Post
    Slim Turn a piece of short bar to a 60 degree point i.e. in your chuck , the top slide is set to 60 degrees for this job. You have now made a concentric centre at the headstock . If you have a accurate ground bar with centres each end, use the bar between the headstock centre you made and the tailstock centre , run the dial gauge along the test bar and adjust the tailstock until the dial gauge shows minimal movement .
    Back again with an update.
    I have adjusted the tailstock as described and all is good.
    I was prepared to regrind the 3 jaw but with the short ground bar in the chuck, the dial gauge was showing 0.001" out.
    This was after taking the jaws apart and cleaning. I also tried switching each jaw around to the next position. The closest were in the original positions. With the worst at 0.008"
    The chuck is a 'Soul' brand. Made in Japan No. 55 DCI body. Is it a good brand?

    DSC_0904.jpgDSC_0900.jpg
    Anyway, thanks again guys for your input and help with the lathe issues. I feel now that I am more on top of the situation (with this lathe anyway)
    I still have a few basic questions though, like.
    Should I always have the tip of the tool at a height, dead center of the workpiece? Is that a basic rule?
    Is it worth investing in a quick change tool post? If so, which one?
    What are the general rules relating to RPM of the work? A lot of the steel I have is high tensile.
    I'm sure that these questions have been answered somewhere else on this forum.
    Thanks again to you all.
    Slim

  2. #77
    Join Date
    Jul 2008
    Location
    near Warragul, Victoria
    Posts
    3,718

    Default

    Hi Slim Yes the tool should be close to centre height 99.99999% of the time ! The quick change tool post . Depends on how often you use the lathe . If you use the lathe once every few months then is it worth the cost of the QCTP ? The QCTP is a great time saver and I think everybody, after using them would not wish to go back to the older style tool posts. RPM's really depends on the diameter of the work and the type of tooling you have and how tough the steel is. It isn't easy to give an answer because of the variables but the old Nuttall is a solid lump . Try experimenting and use plenty of coolant .

  3. #78
    Join Date
    Jul 2016
    Location
    Melbourne
    Age
    35
    Posts
    1,522

    Default

    Soul chucks are i think the original brand name of teikoku who are now a big manufacturer of hydraulic cnc chucks and are very good, I cant speak of back then when they were the cheap competition to big brands like PB and Cushman but i have never used a bad Japanese machining product yet so i suspect yours will be of decent quality. And as morrisman said, get to turning and youll get a feel for when the feed and surface speed suit the material.

    Basic rule of thumb is:
    High Speed Steel: slow and steady, low feed rates, shallow depth of cut, especially with no chip breaker ground into your tool, can achive very good finishes on light passes, carbide wont unless using very specific insert/holder geometries.

    Brazed Carbide: You can push it a lot harder but on interrupted cuts it tends to chip

    Insert tooling: Needs absolutely massive speeds and feeds to get great results but push it really hard for your machine and you should still get good finishes

  4. #79
    Join Date
    Jan 2011
    Location
    Far West Wimmera
    Age
    63
    Posts
    4,049

    Default

    The quick change tool post . Depends on how often you use the lathe . If you use the lathe once every few months then is it worth the cost of the QCTP ? The QCTP is a great time saver and I think everybody, after using them would not wish to go back to the older style tool posts.
    True, I think. I have never used one.

    You need to balance the cost against the convenience. Factor in extra tool holders for every tool you are likely to use. If you keep swapping tools in tool holders you may as well stick to the 4 way. It is far easier to adjust centre height with a QCTP.

    I have all my tools marked with the spacing required to set at centre height which speeds things up. I use 20mm tooling where possible and all of the 20mm tools I have require the same spacer. I have also made a gauge to measure centre height at the cutting edge which uses a dial indicator and so gives actual measurements of the spacing changes required.

    The QCTP that I would use on my lathe is a CA size. I would think your lathe would take a CXA if it is the same as my old Nuttall. I have not bought one because of the cost which I think is way too much just for convenience. It has been suggested that I use a CXA, but 20mm tooling will not quite fit in the 3/4" holders and all these holders will need to be opened up. I find it just a bit strange that CXA holders seem to be designed to fit 16mm tooling, which I think is too light for this size lathe. I have a 25mm parting tool, but it was just over centre height and needed a bit taken off the bottom. It is now on centre without spacer, but it was quite a job to mill it. Tough steel.

    Some food for thought.

    Dean

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