8 replies to this topic

[SAMAPTIN]

Hi All,
I have a query regarding tool for fine grinding.
Currently I am in a process of making 14 inch mirror. Rough grinding is in progress.  For the fine grinding (or even polishing), can we create the tool using general purpose M-Seal. While I was reading about it, I got to know that its waterproof, less curing time, crack proof,  moldable, etc.

 

Has it been already tried by anyone? Any thoughts regarding this.

Thanks,
SA

[dodo]

Hmm! Very interesting idea. I have never tried it and will always prefer glass as a grinding tool as it is quite cheap. I think for a 14" full size tool 1 inch thick you will need more than 3 Kgs of M seal. 

Maybe the experts would find it easier if you can give the composition of M seal.

[ckh]

It's epoxy and probably pretty flexible and besides very expensive. Cast Hydrostone is hard stiff and relatively cheap.

[Ed Jones]

IMO a bad idea.  Use a long cure time epoxy (not 5 minute) and pennies. Very easy to keep clean between grits.

[SAMAPTIN]

Hi,

I tried to use M-seal as tile tool. The result is fantastic. M-seal hardens in 2-3 hrs. 

The reason why I wanted to check this was, earlier I made glass tile tool. After using it for few days, I realized that there are so many scratches  developed on the mirror glass surface due to glass tiles. Since most of the curve was already formed and matched to the glass tile tool, starting with fresh tool was not a solution. Hence I landed up with the M-Seal based tool. With M-Seal I could easily matched the existing mirror curve and continue my work.

 

Thanks,

SA

[ckh]

I don't understand. You made the entire tool of M-seal or did you use it to stick tiles on? Are you grinding on M-seal? Sorry just confused.

[SAMAPTIN]

Hi,

 

Yes the entire surface in contact with mirror is made using M-seal (very similar to tiles). I put M-seal on the Plaster of Paris disk so that means I am using M-Seal for grinding.  

 

Thanks,

SA

[ckh]

How is it similar to tiles? Tiles are hard. If this is the M-Seal I googled, it's epoxy which is soft. Grit will get embedded in it.

[SAMAPTIN]

Hi,

 

Sorry for delay,

This M-seal tool is very much similar to tile tool.  I have used M-seal used for  plumbing jobs. Your observation is correct its very soft. I used Aluminum Oxide  302 & 304 with it and it worked perfect, no grit embedded. Now my fine grinding is almost through.  (rough grinding was already completed)

here is a picture.

 

Thanks,

SA

Edited by SAMAPTIN, 10 February 2019 - 12:18 AM.