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Step 8: Insert the round stock and drill

Picture of Insert the round stock and drill
The round stock has been inserted through the holes in the support.  Push the drill bit and the round stock into one another.  Because my motor turns at 3,000 rpm, I drill in very short bursts to keep the bit from overheating.  Some radial arm saws have a 1/2 x 20 spindle that runs at a greatly reduced speed and is helpful for drilling operations. 

The jig for this operation is specific to the size of the round stock used.  It would be difficult to remove the jig and attach it again later.  Too many things would have moved and the holes in the uprights would no longer be concentric with the drill bit.  But, it is very useful when you have a specific need for a concentric hole in a longer piece of round stock. 

 
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Nice instructable Phil...  I haven't used my saw for boring yet (mostly because of the state of my garage) but this is a good first project...

You could add a clamp such as this one from Rockler to make sliding the jig easier and help with alignment:

http://www.rockler.com/product.cfm?page=16448
chrwei4 years ago
you could put a couple holes in the table with lag bolts to attach the jig, this would make realignment a snap.  You could even have multiple jigs using the same mounting holes.

or a drill press vise like this one http://www2.northerntool.com/hand-tools/vises-clamps/item-153813.htm would allow for rather easy adjustment for any one-off holes you want to make.

or if you only want to bore center holes in round stuff, you could get a self centering chuck like these http://www.workholding.com/FINDSELFCENTERINGCHUCK.HTM