Z is for Zero
In discussion with some colleagues at work
on today’s topic on zero they said that I should have a bit where the limit of
the function tends to zero. Being that I
generally do not discuss calculus on the blog generally and that limits are not
my favourite thing to talk about I will defer that topic for the time being.
A zero is an important concept in building
something. It is also known as a datum.
This is the point in which to measure everything off of, and therefore
all cuts and work are from it. I typically
have two types of measurement errors, the first is where I just make a mistake
and the second is where I take a measurement off of another cut without double
checking to make sure the measurement chain works out. Sometimes it is as simple as I did not
account for the width of the blade in the cut.
Other times I was just not careful in the math to work out the chain.
On lumber typically the most accurate sides
to take measurements off of are mill cuts or the factory cuts. They are usually identified either with some
paint or they have writing on them. You
know that the cuts are parallel and perpendicular to the work so that your
other cuts have a chance at being so too.
When machining you will take your metal
stock and make a zero by facing off the stock so that it is also flat, parallel
and perpendicular to the work surface.
From this surface all of the measurements are worked off from
there.
I have made these mistakes on my personal
projects and whenever I get a drawing that has a dimension that comes from
nowhere I tend to ask a lot of questions about it, or try to work through the
measurement chain to see if the measurement is correct.
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