Mirror Grinding

[astrosathya]

Hi Everyone,

I am thinking of re-starting mirror grinding at home. I used to grind by hand and in this method, when we use the 1/3rd off-centre strokes for hogging out the sagitta, the upper glass becomes concave and would be polished into a mirror. 

However, this time I'd like to build a Mirror-O-Matic or something similar and do not understand that if the tool is on top, how will the bottom glass become concave? 

Or am I mistaken?

Please advice.

 

[Chriske]

There's no need to build a complex machine like a M-o-M. I have two of these machines and never use the 'sideway motion'. At the time we built these machines we did not know it was possible to do it otherwise with a very simple setup. A fixed post will do the job as well. These days you'll find lots of amateurs using fix post grinding on the net.
One of these guys with lots of experience is Gordon Waite.