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I have some bolt holes drilled in some 10mm cast acrylic. When tightening one of them I heard and then saw a small crack running off from the hole.
It has to be done up pretty tight (maybe not as tight as i did) so is there anyway to strengthen a hole?
It was laser cut if that helps
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If the acrylic isn't meant to 'crush' together then you can sleeve the hole with a piece of metal pipe.
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As kellys_eye has said a metal insert in the hole will help prevent this.
If you are tapping the acrylic to accept a thread you are better off using a thread insert if you have to have the bolts tight.