I am researching for diy lens grinding . This paragraph is somehow technical and forcing the limits of my english.
As I told at my previous mails and as agx points , lathing is a way for lens grinding.
I am meaning with lathing , a motor is turning with the glass piece and a norrow grinding head is drawing the shape of the lens in 2 dimension on the glass piece and removing the material.
I am a person who wants to manufacture many same lenses for diy camera for example lomo anamorphic lens copy.
I will be needed to carve may be 6 surfaces with high precision.
I have a solution IF you have similar needs , and if cnc electronics , controllers and motors seem to you very expensive.
I think grinding turning head could be built to move on interchangable rails to move for grinding the glass.
These rails could be built relative cheaply at cnc shops one time but can be used hundreds times.
CNC machines work 1/1000 mm precision but even a leica apochromatic lens element have a 1/125 mm precision. That is a important point or barrier , you can cross it on rails.
Mustafa Umut Sarac