Fabricating Part for a reel

[DKirk]

Just awaiting delivery of a 70mm back, brings me the subtle quandry of how to develop the film. Can anyone suggest how I could modify or fabricate a plastic reel, or indeed a lasagne type reel for this. Trying the smaller format approach first (have an aerial camera that takes 5" rolls that I'd like to use - thinking that the lasagne / film apron approach may be best). What would be the best material to use and how best could I make the dimples to ensure the whole film gets developed?
Hopefully if the 70mm proves successful, then creating such a reel for the larger 5" roll should be a matter of scaling it up - last I looked I think it was Agfa who still makes aero film in 5" rolls. . .

[Jim C.]

Does it have to be a reel ?
My first thought was to have a spiral CNC milled into delrin or another type of machinable plastic.
Did a quick google and Lomo makes or made a reel that was used to develop super8 film -

http://www.super8camera.com/processing.php

The Lomo reel might be easily adapted to hold 70mm film which I think is the same size as 120 roll ?

Then there is this novel approach using a PVC pipe -

http://www.peaceman.de/blog/index.php/inexpensive-super-8-home-processing-tank

[Steve Smith]

Most reels are in two halves and are adjustable for various (or two) film widths. It should be possible to modify them to get them the right distance apart.


Steve.

[Bob Salomon]

With or without sprockets? Sprocketed 70mm is quite a bit wider then 120/220. How long a roll? 70mm is usually many feet longer then 120/220 film.

[DKirk]

Thanks for the help so far - I've got perforated and non perforated. Unless I can get a suitable material for making the lasagne/apron I'll be going with the extending the reel option - I realise that this would limit me to 220 length though - hence looking to find out the materials used for the 35mm film aprons / lasagne reels, then simply scale it up and use a paterson or JOBO tank for inversion or stand process.

[Michael Cienfuegos]

120 film is only 62mm in width. There is a 616 stainless reel on Ebay right now, it is 70mm wide. A bit short for 700 film, but at least the film would fit the reel.