Belt grinding rookie

M

Metalmoon

Joined
Jun 8, 2014
Messages
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I have a piece of glass glued to an attachment on my Platten and it keeps breaking the glass .i had the base surface ground,and glued the glass with gorilla glue.
 
Sounds like something is wrong. Tell us where you got the glass and how you mounted it. Pyroceramic glass is really tough stuff, and should not break easily. As always, a photo helps immensely.
 
Check and see how the platen is bolted on. In some cases bolting it on can cause stress to the platen and crack the glass.

It should be bolted on with even tightening to makes sure there is not stress on the platen
 
Use a strong 2 part epoxy, or JB Weld. Gorilla glue does some expanding. Maybe it expanded and pushed out more in some places, causing the cracking. When you put on the JB weld, spread it on both the glass and the platen, and "slide" it on. This will get rid of bubbles and seal things better.
 
Metalmoon said:
Yes it is tempered .
Click to expand...

bladsmth said:
Sounds like something is wrong. Tell us where you got the glass and how you mounted it. Pyroceramic glass is really tough stuff, and should not break easily. As always, a photo helps immensely.
Click to expand...

Tempered glass and Pyroceramic glass are not the same thing.






Pyro-Ceramic



We now carry Neoceram, for wood stoves, fireplace inserts, fireplace screens, ovens and space heaters. withstands approximately 1470º F.

3/16″ Neoceram
Tempered Glass for Fireplaces



We also have Tempered Float glass available:

Withstands approximately 450º F

Thickness: 1/8″ - 3/16″ - 1/4″
 
That is what I was getting at. Pyroceramic and its cousins are tempered, but tempered glass isn't pyroceramic.
 
Thanks for all the comments I am ordering a new piece of glass from Pops knife supplies and I'm going to try the Apoxsee or JB Weld I'll let you know
 
It sounds as if your glass cracked due to heat and/or improper glass.

Still . . .

Clean both bonding surfaces (glass and platen) very well with a decent solvent like acetone before bonding the glass to the platen. Make sure they are absolutely clean and free of oils or solvent residue, then bond them together with a quality 2 part epoxy like the WEST SYSTEM or a strong epoxy supplied by one of the knife supply houses.

My first pyroceram glass plate came loose from my plate while grinding and it was an event I don't want to repeat. Some people recommend that a mechanical shoulder or edge be incorporated into the platen to prevent the glass from coming loose, but my second piece has never dislodged using the preparation technique that I described.

Yet, I'm about to buy another glass plate since I've noticed some wear.

Good luck.

Mike
 
Instead of using the "fireplace glass" you may consider the hardened and beautifully polished platen made and sold by Nathan Carothers AKA Nathan the machinist. He also makes a water circulating plate that mounts behind the platen called a "chiller" That are precision made and reasonably priced in my opinion. I must state that I have never used a pyroceram platen to compare to but I have been getting great results from Nathan's platen. Also I see that USA knifemakers supplies pyroceram glass to fit most platens. It was over 100 degrees in Bakersfield yesterday and the platen stayed cool because of the "chiller'.
 
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