Sanding 2ft diameter hole

[Ed209]

I have made a 2ft round window with 4 pieces of 18mm ply cut out with router and glued and screwed together.
I now need to sand it so that all the bits become one, not far out couple of mm here and there.
Never had to do this before is a flap or drum sander the way to go?



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[wallace]

Drum sander in a drill

 

[novocaine]

spoke shave.

if you must stick to power tools, screw it to the bench and use your router with the circle cutting frame first to get a perfect circle then tidy up with a drum sander.

 

[Ed209]

I don't have to use a power tool just want the best method so it doesn't go out of shape. the router option is out as its 72mm thick and also the last piece is a 8x4 sheet of ply
All seemed a good idea at the time

 

[sunnybob]

Are you talking about the flat surfaces? or the inside of the hole?

In a hole that size all you need to do is wad up a fist sized piece of rag and use it as a soft sanding block with some 220 grit paper. That will stop any unwanted edges appearing.

 

[adidat]

without fulling knowing the project and what tooling you own, you could do the routing on a circle jig to 40 mm, then flip it over and finish the other sided with a bottom bearing flush cutter?

adidat

 

[MattRoberts]

Get a flat flexible rectangle (some thin plastic or similar) and spray glue some sandpaper to it. You can then sand the curve and have complete control