I’m making a handheld walnut, 6 inch round mirror with curved handle and would like to roundover both sides for a nice curved edge. I can roundover one side with 1/4 roundrover bit with a guide bearing but when I turn it over to do other side, guide bearing has nothing to ride on (since it has now been routed away) so bit dives into piece.
So, I made a template to attach to workpiece but bit is too short for guide bearing to reach template. This doesn’t seem like an unusual task but I can’t figure it out short of buying a $40 double roundover bit.
Any suggestions would be most appreciated, (It’s a Christmas gift)
thanks,
douglas
Replies
The only thing I can think of is to use a template and a guide bushing if you have one large enough.
ne sutor ultra crepidam
Why not try a half-round bit? Or, try raising the quarter-round bit enough so that the cut leaves a small flat, allowing you to round over the second side. This will leave you an incomplete round over, but may get you close enough that you can smooth the rest with hand tools.
Bob K
You're in a fix. Can be done with a semi sophisticated templet, smaller than the work.
Shank bearing (or centered collar) 1/2 round cutter, bearing rolls on templet, work underneath. Work has to be centered and well clamped for this to work. Moreover the templet sandwich, if hand routed, takes some trick fixturing. Vacuum clamping for the router table; nunthin's easy here!
Better, for one piece, to undersize the round over and sand the booger with a small snading caul.
Multiples? May justify the fixturing, but one-off? Never.
Routers
Perhaps they sell longer bearings for your bit?
or maybe create a jig for the router table?
Chaim
Make your own mistakes not someone elses, this is a good way to be original !
When I need to round over both edges of a board with a quarter round bit, I generally use a fence lined up with the bearing. I realize that you are working with a curved piece rather than a straight board, but I think that this method would be a simple way to solve your problem. Even simpler - sandpaper!
Chris @ flairwoodworks
Hi,
Use a router table or if you don't have one make a simple one that you can clamp to your work bench. Then make a simple curved fence that matches the outside diameter of your frame. This way the guide bearing doesn't come into play.
Paul
Thanks to everyone who replied, I'm trying some of the suggestions.
thanks again
nu,
I have visions of a fence very similar to a resawing fence that protrudes out from the regular fence to a sort of rounded point. Then just barely bury the bit in it and leave a small strip in the center for the other side. Once both sides are complete simply sand off the strip in the center.
Regards,Bob @ Kidderville Acres
A Woodworkers mind should be the sharpest tool in the shop!
Drop the bit down so the bearing is riding on the center of the piece. Flip it over and rout the other side. A little sanding will blend it in so no one will be the wiser. Simpler to fudge it a bit than get all anal about it. I'd sand a bit more on the handle as having the same rounded profile might be less interesting than having some iteresting progressions.
Buy a small rasp (maybe a file too) and a few sheets of sandpaper.
Try a router bit with a soild brass guide instead of a ball bearing. Since there is no space between the cutter and the bearing, the brass guide will ride on the edge of your profile without giving the little lip you now get. Merry Chrismas, Matt
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