10" tool blank
Posted 28 January 2013 - 10:00 AM
Posted 28 January 2013 - 11:35 AM
Posted 28 January 2013 - 12:18 PM
You can use plaster of paris if you seal the tool with epoxy before gluing the tiles on. Hydrostone is waterproof, as is dental plaster mentioned by wirenut above.
Check out the mirror making section on Stellafan's website for instructions on making a tile tool. I'd post a link, but it appears to be down at the moment...
Posted 28 January 2013 - 02:21 PM
Posted 28 January 2013 - 02:38 PM
I couldn't recall who quickly the tools did it so I am grinding a 10" Pyrex blank with a cast glass tool that has a series of ring channels in it.
It does grind a bit slower but cleaning the tool is much easier as grit gets caught between tiles and tool can lose it epoxy coating leaving pits that hold grit too, thus needing occasional repairs.
Posted 28 January 2013 - 04:11 PM
Posted 28 January 2013 - 04:35 PM
Posted 28 January 2013 - 07:24 PM
I have used tile tools on all my mirrors except the 4" Schiefspiengler. For that project the glass tool becomes the secondary mirror.
Posted 29 January 2013 - 06:18 PM
Might be worth trying if you use a diamond cup tool, steel nuts etc to hog it out 1st. My 1st blank was pyrex and I found it wore a plate glass tool away far to quickly to be anything like easy to use.
Posted 30 January 2013 - 11:09 AM