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Subject: Re: Sanding Extension table edges

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Message Thread:

Sanding Extension table edges

12/10/14       
Greg Aanes  Member

Website: gregaanesfurniture.com

We make lots of Boat Top shaped extension tables and are looking for the best way to accurately sand the edges so the halves match. Taking them to the edge sander is cumbersome and ripe for slips and the resulting shape changes. Currently the tops are clamped together after the alignment pins/holes are installed (and have tiny mislaignments), and we RO sand (slow and dusty) the edges flush.
Our newest idea is a 48" stationary belt sander on wheels which can be walked around the top. Running the top around the stationary belt sander isn't satisfactory because of the size and maneuvering. It seems easier to keep the heavier and larger half stationary while the smaller part of the process does the moving.
What are other people doing out there?


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12/11/14       #2: Sanding Extension table edges ...
nicko Member

could you make a template and run router against it with a good spiral bit in it?
it should only need running a peice of sand paper over it by hand to finish it up
good luck..................nicko

12/11/14       #3: Sanding Extension table edges ...
David R Sochar Member

How much are we talking about? 1/16" 1/8", 1/4" ?

The first tool I'd reach for is a skew angle block plane well-sharpened and set up, if it is a sixteenth. If it is easy to set the top up on edge, I might use the spokeshave, though any end grain planing is slow going.

Then a R/O with dust collection, or a long radius sand block (or 2 - 80 grit and 100 grit) that will 'automatically' find the high spots and level them to the desired curve. First, you need to size - or cut - the wood, then sand it for feel and finish. The finish sanding should be no different than that for the other edges.

Any more than that, and I'd do the router with spiral bit and a template.

I do admire the good outside the box ingenuity of the big belt sander on wheels, but they can cause more problems than they solve.

12/11/14       #4: Sanding Extension table edges ...
Greg Aanes  Member

Website: gregaanesfurniture.com

Nicko- I think your idea sounds good, currently we make about eight sizes of tops with most of our orders being in three of the sizes. So doable to make a templaste. Come to think of it we have templates already.
David- handtools are my ice cream also, but getting employees up and running with handplanes and scrapers on end grain (when all they want to do is grab a RO sander) seems dicey. We use a long block to level the bumps by hand at this time and I was thinking power tools to speed up the process. Trying to get these guys out of the "muscle it through" mentality. Good ideas and thankyou. I love the stimulation of communicating with other craftsmann on Woodweb-

12/14/14       #5: Sanding Extension table edges ...
Chris

Forgive me if this seems obvious, but depending on the amount you are doing, why not either outsource to a cnc or buy one? Fair curves and minor hand sanding if your cnc programmer understands your needs

12/14/14       #6: Sanding Extension table edges ...
Greg Aanes  Member

Website: gregaanesfurniture.com

We cut the shapes with a cnc router. I was unclear that this is mathing of the top halves after the registration pins(dominis actually) have been put in. Even using stops the table halves can off as much as 1/16" when pinned, so that is when we must monkey with the arc and have issues with keeping a smooth arc when viewed from the end.

12/16/14       #7: Sanding Extension table edges ...
Scott

I am wondering if you can just pin the blanks first and then cut the shape on the cnc.

12/18/14       #8: Sanding Extension table edges ...
mark

I don't use a cnc, but generally I do like Scott is suggesting: joints first, then edge. Flexicat makes a nice flexible longboard that might be of some use to you for cleaning the chatter without lumping the curve, but I don't think it would help much with a stepped edge joint. If the tops are too large for your router once assembled, then I'd suggest rough cutting like you're doing then cleaning the edge with a handheld router and a single edge template that the worker can place by eye.

1/2/15       #9: Sanding Extension table edges ...
Bruce H

I'd make a master pattern, vacuum it to you top blank and cut the edges using a shaper and copy wheel. Every one would be exactly like your pattern. With sharp tooling sanding would be minimal.

 

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