Should'nt the stylus and the bit be same size?

On Thursday, September 29, 2016, Richard Ellis <rchrd.ell...@gmail.com>
wrote:

> Thanks Mike for the explanation.
> Today I put a piece of ash in the chuck --same dia. template in the same
> place as the forsythia and it came out a smaller size????, maybe the wood
> pulls the cutter towards it.
> The cutter is on the side nearest the leadscrew and the rotation of the
> spindle is clockwise looking from the headstock.
> I can make the spindle turn the other way , which way would you recommend,
> using a up cutting two flute spiral cutter and top router speed .
> Cheers
> Richard
>
> On Wednesday, September 28, 2016 at 5:40:27 PM UTC+1, LILtwisted wrote:
>>
>> 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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