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[Dekan]

I have acquired model kit... all the formers have 3 mm slots... but the wood is 4 mm thick.

I could have used a file... but can I find a 4 mm wide file..No.... Its not a dimension that anybody quotes.... Length, height but no width        Anybody got any ideas?

[dbninja]

so...    set up your CNC Router with a 4mm  Diameter cutter, clock your centres on the X-Y axis..    whats your problem? 

seriously

just make a sanding board of the correct thickness, use scrap 3, 3.25, 3.5mm with a layer of double sided tape and emery cloth and set too   the sand paper tends to be more forgiving than a file and doesn't splinter the wood as much

i have the same problems trying to insert new pieces of ply into my old Aerokits fleet when i am restoring them, and no i haven't found a scource for old imperial unit ply.....   despite what the model shop calls it


db

[guitar man]

Hi Dekan
          Needle files are very thin though I find that wood tends to clog them up I believe you can get Tungsten carbide ones which may be better, but as Dbninja said a sanding board works for me

[Dekan]

I have thought of making up a sanding tool, but I thought there might be something else I hadn't thought about out there

[tigertiger]

Permagrit do slot cutters. They are 3mm but be used to open out the slot.
They also do a flat file.
They are in the expotools.com catalogue p44-45

[RickF]

I would try and obtain a round file tapering from less than to more than 4mm. Drill a 4mm hole in a piece of brass to make a collar then force this onto the file. This will automatically stop the file when the slot is 4mm wide. I have used this technique to make identical slots in plasticard - no reason why it should not work on wood, provide it is not too thick and the file is kept unclogged.

Rick

[Nige52]

As nobody else has asked........just what kit is it that supplies things like this?
Also can you not file the tongue down 1 mill instead of widening the groove 1 mill?
Cheers
Nige

[Dekan]

An Aerokits style kit, with 4mm ply bulkheads and 4mm keel and deck supports.....