One thing you may look into is the square of the router. If one side,
left or right, is high, it will do what we are seeing here. Also if the
router is allowed to lift because of pressure it will do this. If all
is close enough and you take a clean out final pass, start it half the
distance of the blade to cut the ridge instead of repeating the same
cut. About a 1/32 of an inch is plenty.
Mike OK
On 2/15/2017 10:30 AM, Jim Riggen wrote:
First off, thank you all for your comments. I am learning a lot.
The accuracy I am concerned with is that of the setup. How accurate
does the setup have to be to get rid of the ridges that remain after I
turn the work piece to diameter.
The attached photos will (I hope) show the ridges.
The process I am using is:
1. Set the bit height,
2. start at the tail end,
3. place the center of the bit about 1/2" to the rear of the center of
the cylinder,
4. router carriage fixed,
5. rotate the work piece 1 revolution.
6. Move router abour 5/8" to the right
7. Repeat steps 5 and 6 until reaching the head end of the work piece.
The ridges can easily be felt and are not just a bit of fuzz. They
don't sand off very well at all.
On Wed, Feb 15, 2017 at 8:17 AM, 'joe biunno' via Legacy Ornamental
Mills <legacy-ornamental-mills@googlegroups.com
<mailto:legacy-ornamental-mills@googlegroups.com>> wrote:
my two cents...nine thousandths, .009, to me is an acceptable
tolerance for a piece done on a legacy machine...there are times
when we are cutting up some solids for a job and overnight I have
seen a difference of thirty thousandths, .030 or 1/32",the next
day...I have even gotten drawings from architects that had
measurements with 1/64th inch dimensions and just had to shake my
head, LOL...and of course, those were all computer generated
drawings...as far as the corner spec's go, the greatest difference
there being thirty thousandths, .030, 1/32", so if you wanted to
tweak that a bit you would most likely get better results...but
like I said, to expect metal-turning lathe tolerances on a legacy
( i.e. .001), might be unrealistic...even hand sanding can disrupt
anyone's tolerances...bill's four block method is what we do and
if we are off a hair, we don't sweat it...just one person's
opinion here...joe biunno
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