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0.1-> 00.1-> 000.1-> 0.00. Are micrometers turning tools?

 
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Arch
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PostPosted: Thu Oct 25, 2007 2:19 am    Post subject: 0.1-> 00.1-> 000.1-> 0.00. Are micrometers turning tools? Reply with quote

Numbers are important in woodturning, no doubt about it. Exs.: accurate
and repeatable grinding angles, heights of finials and depths of feet,
rules of thirds, and carets of the golden rule. No less necessary to
determine accurately are composition of finishings, length, width and
depth of flutes, percentage of cobalt, on and on. That said with an
abundance of caution, agreed with and disclaimed:


As I see it, woodturning for pleasure is mostly an intuitive endeavor.
Many of us in our working lives deal with numbers used in measuring
something, whether in sales, computers, carpentry, machining, teaching
or preaching. The freedom to turn a blank without weighing it or marking
it off or knowing its exact rpm or worrying about a classical form, not
to mention concern about a superior's opinion is a satisfying change of
pace; truly recreational without adding another problem away from work.


There is a world of difference beween a bit held rigidly in a cross
slide driven precisely by a longitudinal screw and a gouge held in a
hand and freely squeezed and waved around, in and out, up and down along
a tool rest. Likewise there's a difference in information programmed
into a CNC and the free association of mind to gouge. Who said
proprioception? Laser guides, copying devices, form tools or a felt
need to sell our work are each a bit iffy, but since they don't detract
from our satisfaction too much, they are allowed.

As I said, precise and accurate measurements are important, but I
suggested that's not always so. BTW, exactly what percentage of one
standard deviation of you guys agree with me? Come on now, 0.001% can't
be right. :)


Turn to Safety, Arch
Fortiter


http://community.webtv.net/almcc/MacsMusings
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George
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PostPosted: Thu Oct 25, 2007 2:54 pm    Post subject: Re: 0.1-> 00.1-> 000.1-> 0.00. Are micrometers turning tools Reply with quote

"Arch" <almcc@webtv.net> wrote in message
news:15062-471FB6FC-64@storefull-3171.bay.webtv.net...
Quote:
There is a world of difference beween a bit held rigidly in a cross
slide driven precisely by a longitudinal screw and a gouge held in a
hand and freely squeezed and waved around, in and out, up and down along
a tool rest.

My eldest called Sunday in the second quarter. He was setting up his new
planer, and asked what kind of magnetic dial indicator gage I had. He's a
great woodworker, but he's also an engineer, so I reminded him that touch
gages as in the manual were what I had been using on that planer's
great-grandfather for as long as he could remember. "Because you can
measure it is no reason to feel obliged to report in .001 units. The rule
you're using, likely as not, is calibrated in .0625."

Bit of silence, then the reply. "Guess I can use the block setup method
after all, eh?"

"If you're curious you can use the dial, or even feeler gages to find out
how far you need to tweak the microadjusters."

"There are no microadjusters." Silence. " I get your point."

Second half featured a call as to why there were only three wires on the
motor.

Steel City planer, and he says the fit and finish, while rougher than on the
old Rockwell Invicta, were better than the Powermatic he was looking at.
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