Mirror Grinding - Diamond Curve Generating Machine

[foreilly1958]

Pretty neat. It appears to me that you are grinding a home generated plate glass thin blank to a short focal ratio. How did it come out?

Best regards,

Francis J. O'Reilly

foreilly1958

[xFrogsharkx]

1 1/2" thick F4.93.

5 hours for diamond generating.

Took roughly 7 hours through grinding stages & clear polished using polishing pads on aluminum facets. Using coal tar and paraffin wax. 9:1 ratio. Slightly under corrected parabola.

Have to many projects to work on to continuously work on. Next 2 mirrors I'm working on are 20".

[skbaliyan]

Could you let me know the sources of curve generating machines for glass samples.

Thank You !

[xFrogsharkx]

Yes you can adjust the curve radius.

Adjusting the turnbuckles, either tighter or looser changes the curve in the track. It can curve from 1' 1/4 to 0' deep. The tracks are spring steel and are able to go back straight.

There are some still photos in the video that this is responded to, "Telescope Making," there is a deviantART link which you might find interesting.

[attila8685]

Hi,

Can you adjust the curve radius what you want to grind, or tis machine is able to make only one radius of curvature?

How many steps do you need to reach the right saggita?

Thx.

Attila from Hungary

mirror maker