Crack expander

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chad
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Crack expander

Post by chad »

Anyone use a crack expander to fill in a star break that has long legs( like 1.5 inch legs) that seem to long for just the tool? Thanks
screenman
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Re: Crack expander

Post by screenman »

I tried one 25 years or more ago, I have not used one since.
Clarity Glass
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Re: Crack expander

Post by Clarity Glass »

Shouldn't need to use crack expander unless the crack leg is tight. Carefully flex/put pressure on crack watching the resin flow to crack tip.
screenman
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Re: Crack expander

Post by screenman »

It does of course matter if the leg is surface or sub surface, pressing on a surface crack will often close it up, whilst subsurface will open it.
IRONSIDE
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Re: Crack expander

Post by IRONSIDE »

Is there any information on at what length a crack changes from sub-surface to a surface crack?
screenman
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Re: Crack expander

Post by screenman »

Just drag your scribe across the top you will here a click if it is surface.
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