Re: [ATM] Mirror Cells - Springs vs. Push/Pull

["Don Clement" <clement.focuser@verizon.net>]

> WARNING!  Simply making hachsaw cross-cuts in your collimation bolts will
> leave scratches in the bolts at the thinnest part (at the bottom of the
cut)
> creating stress risers.  Stress risers are locations in materials that
lead
> to concentrations of stress forces leading to fatigue failure, something
> that you do not want in your collimation bolts.

True. One solution is to make the cut a with rounded corners and smooth
contours. A way to easily make deep cuts in with rounded corners is to use a
ball end mill or slitting saw with a rounded profile. Some hack saws are
made with a round profile wire blade. This will leave a rounded bottom and
less stress concentration.  Chemical milling or vibratory deburring can also
help to relieve stress concentration.

Don Clement
Running Springs, California

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