tolerance requirements for grinding machine ways - Page 3
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  1. #41
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    Quote Originally Posted by Monarchist View Post

    One might ask the same question of 20,000 large Euro worth of Schaublin goodness vs sending any seriously challenging parts out for precision grinding, and just being grateful that it is a rather seriously better lathe than average - requiring little or no "compensation" - the other 300-odd days of any given year.

    IOW A "real world" need? Or just bragging rights?

    The wisest answer I can come up with is... to each his own.

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    Quote Originally Posted by TNB View Post
    The wisest answer I can come up with is... to each his own.
    .. and priced accordingly, yes.


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    30 or even 50.000 euros aren't worth the same for everyone, that is...

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    Quote Originally Posted by TNB View Post
    30 or even 50.000 euros aren't worth the same for everyone, that is...
    It isn't "just" the amount, nor how deep one's pockets hang.

    Rich or poor, there is still the "cost/benefit" equation.

    None of the rich folk I've ever known personally, K.S. Lee downward, are exactly profligate. Careful, rather, as to getting their money's worth. Very!

    Part of how they BECAME wealthy. Rather more than "part" as to how they remained so.

    2 Pataka worth.


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    Remember a CNC grinder will give you better control, ease of operation.

    But the accuracy of the grinder is still dependent on how well the table is scraped and how well the machine is leveled and set up.

    This goes for any machine tool.

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    in theory wouldn't it be possible to map the errors in a CNC grinder to achieve better results than the ways or rails alone? (less expensively anyway) The linear rail specs I have seen don't get below 5 micron per meter variation but if you used a autocollimator etc map the actual movement and then compensated in the controller you should be able to remove much of the error in the system I would think.

    Although surely the more accurate the machine is to start the easier it is to achieve the required results and scraped ways are going to be far stiffer than any rolling element rail, particularly given you don't need the speed afforded by rails.

    Luke

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    Certainly a new condition CNC grinder can probe wheels, parts, and fixtures. Figure compound angles, measure the finished part with it still in setup..All is wonderful for sure..for a price..
    The $20,000 Thompson G&L or Mattison setting idle for a week is easier sometimes to justify..
    Likely a top shop like Detroit Edge Tool or Cash's shop would have both where needed.
    I know for some work i would take an easy one-up to the surface grinder and finish faster than I could write a program for the CNC ..in some cases,
    IMHO.


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