My first project is a round table top. I have researched the group's past
postings on direction of cut with a router, but still am not sure for my
situation. I would appreciate some knowledgeable help.
Table diameter after cutting will be 46 inches. The table rim is mahogany,
approx. 1.75 inches thick; the mahogany is glued and splined in a hexagon
shape from pieces that are about 5 inches wide. The grain on each piece is
fairly straight. I have made a 2 by 6 stretcher that forms a diameter
inside the hexagon, and have a 0.25 inch carriage bolt protruding from the
center of the stretcher for my pivot. My router is restrained by two 0.375
inch-diameter steel rods through the router base to the pivot. The bit is a
0.5 inch diameter, with two straight flutes.
I would like to climb-cut to minimize tearout. I believe the trammel is
strong enough to keep the router in check. However, the bit with be
partially exposed (about a quarter inch) as I hit the mid-point of each of
the hexagon's sides. Will this cause any problems? I know to make multiple
passes, increasing depth each time, but I'm not sure of the effect of the
bit coming partially out on each side.
Thanks for your help.
Dangerous, and you wouldn't want to.
Replace the wheels of your car with big sawblades and drive along.
That's a climb cut. As you might imagine, there's quite a force
generated to drive the saw along relative to the road/workpiece.
It's safer to feed the other way. The workpiece is pushed back at you,
and you both oppose this and feed it by pushing in the same direction.
Things are under control.
Climb cutting is hazardous, because you're either pushing the feed in
one direction or restraining it from leaping ahead of you. As you
feed, and as the cut changes, then the force you need to apply changes
direction. This is always somewhat hazardous.
Climb cutting is really only done (for hand tools and woodworking)
with routers and small cutters. For saws and planers, it's just far
too hazardous. No-one likes doing it, but it can reduce break-out
when working across the grain, especially when you reach the end of a
Die Gotterspammerung - Junkmail of the Gods
CW, thinking about it is how I came up with the suggestion. Considering I've
had my router for two months, I thought I was contributing an idea no one
else brought up. If you would be so kind as to elaborate on the 'think about
it', I would be most grateful for the wisdom and advise. I don't want to
wear my router anytime soon 8~).
The problem with climb cutting is that you are cutting in the same direction
as the cutter is trying to pull the router. Holding the router back against
its urge to jump forward is tricky and not recommended in most cases. The
spiral bits ill help from a finish standpoint but will be the same as strait
bits in their propensity to pull the router forward. That said, climb
cutting is considerably more efficient. Smoother cuts with virtually no
tendency to tear out, better chip ejection and far better cutter life
result. Unfortunately, for the majority of routing, climb cutting is only
practical on machines (such as CNC routers) that have backlash control.
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