Thursday, July 28, 2016

Log Slitting Film for New55 COLOR

So-called "log slitters" are used in the paper industry to cut wide rolls of paper, and tape, into thin rolls. That roll of gaffer's tape you have was once a big wide roll that was sliced up into smaller rolls and then sold.

We have to cut color negative stock, which comes in a wide roll, down to about a four inch width after which the roll goes into a dark chamber to be cut into individual sheets.  I had looked for a reasonably priced commercial slitter but all I could find were machines in the $10,000 and up range.

A trip to Home Depot yielded a little circular saw which was almost toylike. This was mounted on the South Bend Heavy 10 lathe we have in the lab (this is a special NASA owned lathe bought surplus from the Apollo Program).  A mandrel made of a broomstick and a "pool noodle" was used to spin the roll while it cut.


The impromptu "log slitter" on an old (but very fine) South Bend
lathe. The log rotates a big roll of color film. The yellow part
is a "pool noodle" used in swimming pools.



The strip of red tape was straight but now each
small roll can move independently. This
small roll goes into a sheet making tool
that operates in the IR dark chamber.

11 comments:

E said...

why don't you let the manufacturer cut the film? I am sure they can do it more precisely, add notch codes if needed, etc.

Bob Crowley said...
This comment has been removed by the author.
Bob Crowley said...

And who might that be? Not Kodak. Ilford is in England.

Tutejszy said...

Is it ok for this material to be cut in light? won't the light sneak into the slits?

Bob Crowley said...

Yes it can

E said...

so, why not let manufacturer cut it?

Bob Crowley said...

The manufacturer cannot cut it. They don't have that equipment.

Anonymous said...

Has OSHA or your insurance company seen this?

E said...


"Manufacturer can't cut it... " What kind of manufacturer that makes color film doesn't have the ability to supply it in cut sheets? That rules out Fuji and Kodak as suppliers. Doesn't really inspire confidence, I have to say.

Bob Crowley said...

E, please feel free to post comments when you have some information to add, or a real question, rather than your many complaints.

People who are resistant to a straight, factual answer such as "they don't have that equipment" are at a disadvantage.

Anonymous said...

BOB - don't be irritated by the trolls! What you are doing is A M A Z I N G so KEEP DOING IT.