polishing with aluminun oxidePosted By Phil Barker |
I always wondered if this would work.
As an experiment I added some 5 micron aluminun oxide to cerium and polished a mirror which had some grey near the edge and needed more fine grinding.
I did a few wets with good contact and was immediately aware of the rougher sound as I polished away.
This greatly speeds up the polishing 2 possibly 3 times as fast from what i experienced.
The grey went quickly basically i had a mirror that now didn't need any fine grinding.
A ronchi showed a rough but reasonably polished surface.
I didn't completly polish the mirror just went for 1 hour or so.
I then using the same lap which i cleaned thoroughly went to cerium and within 1 hour I could see no evidence of roughness in tests. I was well ahead of where I would be if the mirror was just polishing.
Basically this appears to be a way of speeding up polishing and if done carefully ie lap completly cleaned and returned to cerium has'nt degraded the polish at all.
Interested in comments.
Phil Barker
p.s the mirror is 16 inch f-5 and pyrex.
the lap is my own mixture 7/1 rosin and tar.
As an experiment I added some 5 micron aluminun oxide to cerium and polished a mirror which had some grey near the edge and needed more fine grinding.
I did a few wets with good contact and was immediately aware of the rougher sound as I polished away.
This greatly speeds up the polishing 2 possibly 3 times as fast from what i experienced.
The grey went quickly basically i had a mirror that now didn't need any fine grinding.
A ronchi showed a rough but reasonably polished surface.
I didn't completly polish the mirror just went for 1 hour or so.
I then using the same lap which i cleaned thoroughly went to cerium and within 1 hour I could see no evidence of roughness in tests. I was well ahead of where I would be if the mirror was just polishing.
Basically this appears to be a way of speeding up polishing and if done carefully ie lap completly cleaned and returned to cerium has'nt degraded the polish at all.
Interested in comments.
Phil Barker
p.s the mirror is 16 inch f-5 and pyrex.
the lap is my own mixture 7/1 rosin and tar.