I know this is a basic question, but I'm hoping I'll read some alternatives
I hadn't considered.
I need to make a T, which is a simple butt joint against the 'centre' of
another piece of wood. the depth of the short leg of the T should be
5.234567 (exaggerated) within one RCH. I thought I would clamp two blocks
5.234567 wide to the edge of the wood, then glue and tack the long leg of
my T using the blocks as a guide. Once my gap was filled with the 5.234567"
filler wood I would sand to within 1 RCH>
Any better thoughts on achieving RCH accuracy, especially squareness.
Many years ago, Edward Deming (father of quality control), made the claim
that sometimes it isn't the workers' fault, the fault is in the system. To
fix a recurring conformance design problem, the design and the system of
manufacturing may have to be changed.
- you are working with wood, the nature of the material is not steel.
- Since you are asking this question, I presume you are using home-owner
- your power tools don't weigh thousands of pounds.
- your power tools aren't bolted to the floor
- woodworking sometimes requires skills, not only book learning, but years
of experience with the tools.
- any fabrication needs an error tolerance calculation due to fabrication
process. What are your + / - errors allowed? (have you allowed for wood
Nobody can measure anything beyond three digits (0.000) with any meaning as
the tools for measuring become inaccurate and the results meaningless. With
wood, three digit precision limit is cause for laughter. You are asking for
SIX digit accuracy. (The deflection of the wood by the pressure of your
hands squeezing it will negate any attempt at SIX digit accuracy.)
In short, your "plan" or design is in error if you attempt to fabricate to
such accuracy. Even trying to custom fit with sanding is going to get you
high blood pressure. (sanding will many times cause loss of square in 3D of
parts, as hand sanding is very, very in-accurate; one place always gets
sanded more than another leaving a slight dip in the surface.)
Re-think your design, remember you are working in wood.
For FOUR digit accuracy, the Newsgroup you want is rec.metalworking. Their
toys are a bit more $$$$$.
No straight answers here then?
So now have to go to bed thinking...
Royal College of Hairdressers?
Registered Caliper Handlers?
Roughly Calculated Hairsbreadth?
I am setting the pub quiz tomorrow night. I could ask this question.
On Sun, 11 Nov 2007 02:21:55 GMT, firstname.lastname@example.org (Doug Miller)
I had to laugh at this thread, wondering how long it would be before
someone asked. I think I was introduced to the phrase when I was about
16 working in a hardware store among nothing but ancient (to a 16 year
Now we need a dictionary to find out what one of the words
referenced to explain an acronym is? This is getting funnier
After a day at a slow woodworking show I really did need a thread
like this one. Four out loud laughs so far - and I'm only half way
through the postings. This is great!
BTW the H in question is not limited to the location you provided
- especially in France I'm guessing ; )
You'd be _surprised_ -- if not 'startled' -- at the data available
under the heading of "forensic science'.
He uses only the traditional/classical methodologies -- no power equipment/
Some things _are_, quite simply better, when done by hand.
(thoroughly documented in an 'automation' newsgroup, when somebody transposed
the last letters of the first word in their request for a design for a "bar
Rumor has it that -he- was the one doing the peering.
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