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Getting the flat areas flat.

Posted: Wed Apr 22, 2009 5:29 pm
by DanH
I'm still in the novice stage and aside from my newly acquired bandsaw, everything is done with hand tools.

I'm working on a sitter right now, and I'm having a devil of a time getting the base perfectly flat.

Does anyone have any tips for how I might get an acceptable level of flatness under the circumstances?

Posted: Wed Apr 22, 2009 5:32 pm
by KurtHuhn
Lay a sheet of sandpaper on a flat surface and hold it down with one hand, while with your other hand you hold the flat face of the pipe against the sandpaper and pull the pipe across the sandpaper. If it's really round, you may want to start with a heavy grit like 80 or 120 then move up the grits to smooth it out.

Posted: Wed Apr 22, 2009 5:37 pm
by DanH
Thanks for the speedy reply, Kurt!

I was figuring on something very similar (except using double stick tape to hold down the sandpaper, hoping that would allow me to use both hands for downward force/even pressure side to side).

For future reference and tool dreaming fodder, how do the pro's do it?

Lapping plate/ Sharpening stone?

Posted: Wed Apr 22, 2009 6:20 pm
by DanH
Been doing some poking around this afternoon, and noticed that Stephen Downie mentions using a lapping plate several times in reference to ensuring flat areas get properly flat. Anyone else tried this?

That also led me to the thought that I might be able to use a sharpening stone (since it's probably going to be easier for me to find one of those).

Good idea? Bad idea?

Posted: Wed Apr 22, 2009 6:29 pm
by KurtHuhn
The sharpening stone isn't meant for wood, and is far too fine a grit to actually do anything. And it will load up with wood dust very quickly.

You could use double stick tape, but you need to be sure there's no overlap and no gaps in the tape - otherwise you'll end up with strange sanding patterns on your flat faces.

I actually have a granite machinists plate that I can slap a piece of sandpaper on with some spray adhesive. It's not the only thing I use it for though - it's great for keeping all sorts of surfaces perfectly flat.

Posted: Wed Apr 22, 2009 6:38 pm
by DanH
Now that's a great idea! And I happen to have a stray can of spray adhesive that I've only used once. Perfect!

Thanks again, Kurt!

Posted: Wed Apr 22, 2009 7:28 pm
by KurtHuhn
DanH wrote:Now that's a great idea! And I happen to have a stray can of spray adhesive that I've only used once. Perfect!

Thanks again, Kurt!
That's why I'm here. :D