Essay
Why a frame takes eleven days to make when a moulded one takes ninety seconds, and what those eleven days actually buy.
An injection-moulded frame takes about ninety seconds. Pellets go into a hopper, the machine closes, and a finished front comes out the other side with its colour already in it. It is a good process. It is why eyewear can cost twenty pounds.
A Mori frame takes eleven days. Most of that is a drum full of wood chips, turning.
The block
Cellulose acetate arrives as a solid sheet, roughly the thickness of a paperback. It is made from cotton linter and wood pulp, plasticised and pressed, and the colour runs the entire depth of the material rather than sitting on the surface. This is the whole argument for it: when you file into the edge of an acetate frame you find the same colour you started with.
Sheets are stacked by colour and left to rest. Acetate is hygroscopic — it takes on moisture from the air and gives it back — and a sheet cut too soon will move after it is milled. Resting is unglamorous and it is the reason the frame you buy still fits in a year.
Milling
The front and the temples are cut from the sheet on a five-axis mill. The machine is fast and it is not the interesting part. The interesting part is the bridge, which is filed by hand, because the bridge is the only place a frame touches you that you cannot adjust yourself.
A frame that sits in a drawer has failed. Everything after milling exists to make you stop noticing it.
Eleven days in a drum
Milled acetate comes out of the machine sharp and matte. It goes into rotating drums with beech pellets and a polishing paste, and it turns for eleven days. Nothing is added. The edge is not coated or lacquered — it is worn smooth by collision, thousands of times an hour, until the surface is glass.
- Days one to three: the mill marks go.
- Days four to eight: the edge rounds and the surface starts to return light.
- Days nine to eleven: the finish deepens. Stopping early is visible; stopping late is not.
You can shortcut this. A dip in solvent produces a gloss in under a minute and it looks identical for about six months, at which point it clouds and there is nothing underneath it to recover. Tumbling has no such cliff, because there is no coating to fail.
Glazing
Lenses are cut to the frame rather than the frame being built around a stock lens. It is slower and it is the reason a Mori lens sits flush in the rim instead of proud of it.
Eleven days is not a marketing number. It is how long the drum takes.
