On 08/06/2013 10:44 PM, Gregg Eshelman wrote:
> On Tue, 8/6/13, TJoseph Powderly <tjt...@gmail.com> wrote:
>
>   cosine err?
>   the motion of the axis must be colinear with the motion of
>   the scale theres a few pages supplied wiht all Heidenhain scales
>   describing the mounting techniques and qualifications.
>   i could assume this has been verified, but it would explain
>   motion that returns to same point yet has constant distance err
>   regards
>   tomp
>
> If the scale's not mounted perfectly parallel to the motion axis but is close 
> enough so it doesn't bind as it slides, that would produce an error that's 
> linear and always repeats exactly. But would it produce that much of an error?
>
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whatever angle whose cosine produces 158um over the traveled distance.
that'd be ~.006" and i didnt see the distance traveled stated.
it wouldnt be much of an angle at a great distance.
but i hear its NOT linear so...
forgettaboudit
its not cosine error


(btw theres and external surface on the alum enclosure meant for 
tramming it collinear. )

tomp
tjtr33

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