One thing I do when figuring out the path is to draw the ball on a piece
of paper, then draw the follower then draw the bit diameter centered on
the follower. If there is a smaller bit than your follower, the
follower's center will be farther away from the radius path need to
accomplish the finish ball. You will need to make a smaller template to
be left with the correct diameter.
Lets say a 2" ball, a 1/2" bit and a 3/4" follower. the difference of
the bit and follower are 1/4" or 1/8" radius. The radius of the ball is
1" but to correct we need to make it 7/8" radius in order to accommodate
the larger radius.
the reverse is true if the follower was only 1/4" in this case you would
have to add 1/8" to the template to get the cutting side of the blade to
swing on a 1" radius.
Bottom line here is to draw it out and prove your path with a compass.
Mike OK
On 9/28/2016 11:10 AM, Richard Ellis wrote:
On Friday, September 23, 2016 at 6:02:35 PM UTC+1, Richard Ellis wrote:
Hi All
I am at a loss to understand why, when I try to turn balls from
some pine to go with some kids skittles I have made, they come out
looking like rugby balls instead of spherical shape.
The wood is 1 1/2 dia. and is held in a chuck,--- router cutter is
1/2 inch dia. the stylus on the end of the router carriage is 1/8
inch dia
I use a metal washer /plate of the same dia. as the wood as a
pattern .
The ball as I have said before comes off oval in shape it parts
of very easily, I do the end of the wood first then travel back to
the washer to do the other side of the ball, it just drops off
into the sawdust, which was a surprise
Do I need a larger plate washer or what do you recommend I do
is there a magic formula for the diameters of the cutter plate
and stylus ???????
Richard
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