Crack expander

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chad
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Crack expander

Post by chad » August 18th, 2017, 7:47 am

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 » August 20th, 2017, 12:47 am

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 » August 21st, 2017, 8:12 pm

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 » August 21st, 2017, 10:14 pm

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 » May 7th, 2018, 5:52 am

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 » May 7th, 2018, 9:59 pm

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