On 6/10/2016 9:58 AM, Gene Heskett wrote:
> 2. Since I am about to get a bigger lathe, and I have no experience with
> with  mapping screw compensations, I need to ask if its possible to use
> a screw comp file to map in both directions so that a reasonable amount
> of bed wear, which will probably cause a "U" shaped X error, and that
> will need Z position tracking to properly apply the correct X error
> compensation?
>
> Is this possible?  Or can it be made possible?

That is a very interesting question Gene...  I have no idea.
The standard screw comp works in both direction so it takes into account 
backlash compensation.   But you want to correlate the lathe X 
compensation with the Z movement to comp for bed wear/error.
.
I'm going to try the standard screw comp out next week on a brand new 
ball screw that must have been made with a hammer, anvil and file.  The 
screw it out something like 0.030 over 12 inches in one spot.    This is 
a new screw supplied by Flow for a Flow water jet.   I can't believe 
they sell this junk.    After the screws were purchased Flow said that 
they screw map each screw with a laser... and now I know why!

Dave

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