Lens Grinder on rail + no cnc + for diy men

[AgX]

But I'm worried about a person trying the cut the lens without water. The glass powder will slowly kill you if you breath it long enough, just like Black Lung!

In case this has not been referred to here and at that former thread it is surely because it should be obvious, even metal turning is done mostly with cooling/lubricating and when I grind the edge of a simple glass pane by hand I use waterproof silicone-carbide paper and water.
That encapsulation I referred to was intended to keep that abrasive cooling/cleaning water of the slide/sledge parts of the lathe.

 

[Mustafa Umut Sarac]

Hello , Let me write a long post to clarify my last posts.
When we read the posts which everyone sent , there are two lens making methods appear.
First , turning the glass and carving it with diamond tip
Second , turning a female lens mold and carve a glass with liquid abrasive jacket which placed between turning female mold and glass.
These are the technologies
which require expensive motors
cnc machined parts
cnc machined female mold
electronics
sensors
lots of noise
expensive vibration dampers etc etc.
My latest idea is to use pressurized injected abrasive liquids and turning glass piece contacted with one of the wet zone. glass move and turn its own axis and self shaping. may be this glass piece might be turned to a closer shape to the final shape before go to liquid treatment.
This can be made very slowly.
Problem could be the wet contact zone shape and its stability over moving glass.
I think , if we want to control the wet contact zone shape , we can use magnetic liquids.
this is a drawing of the machine.
magnetic winding
magnetic liquid with its pumps , its pumped because it has to move for grind.
magnetic liquid wet zone opening for to contact with glass surrounded with walls.
glass piece which is in contact with narrow opening which is a house of magnetic liquid. Pumps always shake , move inside of magnetic liquid but magnetic winding keep the shape of zone stabil.
Finally , I have a new idea about turning the glass. It can be used extremelly low speeds but higher force.
I saw at russian telescope and satellite optics making web site that russians were deep coarse step carving the glass very slowly . I think there is a place for ultra cheap slow rpm machines and diamond tip.
Final carving could bemade by slow flowing liquids.
By this way , we use cheap motors and pumps , no cnc but cams and no need of vibration dampers.

Best ,

Mustafa Umut Sarac

 

[AgX]

Greg,

And what about doing the polishing too on that lathe, as I hinted at in an earlier thread?
This way one would nod loose that freedom of form cutting/grinding on a lathe yields.

 

[Dan Fromm]

Greg, do you do more than cut pre-made lenses to fit frames?

 

[Mustafa Umut Sarac]

I learned that the real problem is subsurface cracks after grinding

 

[barryjyoung]

Unluckily the chips (material taken off by the cuter) is GRIT and it is abrasive, Silicon Oxide one of the many choices of sand paper. The final polishing of the lens used very fine abrasive. The lathe used in the lens cutting is not a standard Machinist machine tool.

Silicon Carbide or Aluminum Oxide are the two most common abrasives used in sandpaper.