Setting angles of a compound using laser pointers

Hello Gentelmans,
Some older lathes doesn't have an angle scale on a toolpost. It is
possible to adjust the toolpost via laser pointer with or without
colimating lens and some linear scale on e.g. spindle.
Here's my document with calculation of residual systematic error.
Suprisingly it is possible without much effort to get 1/6 deg
accuracy. I couldn't find any error in calculus.
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Comments and corrections appreciated --Jack.
Reply to
Jacek Zagaja
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Here's another approach that works well for me.
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Reply to
Ted Edwards

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