I am including a copy of the print out that I used for producing the barrel shaped
arm and from this it can be seen that the infeed progressively gets greater along
its length, that is from two tenths of a thou to eight thou. Again when viewing this
to 8 decimal places the results were identical to those using the CAD route. This
was reassuring, as because no formula was needed to be entered in the case of using
the CAD program it confirmed that the formula that I had been using both manually
and in the spread sheet was in fact correct. I often find this useful to confirm
that a formula that I have developed is correct.
Just Out of Interest
Having completed and used the calculations I thought that the spread sheet that I
had developed had served it purpose but even so kept it on the PC. Later, I had moved
into my cabinet making mode to make a dining table and having decided that it should
have very slightly curved edges went about fixing a pencil on the length of string
with the string anchored at the other end and used it to scribe a curve.
I soon learnt that the string needed to be very long, so long that it was too much
for our garden. We do live at the end of dead end road where I could use the method
but was not keen on the idea. However, I then remembered my spread sheet program
and quickly started the PC put in number of increments, half the length of the table
and half the difference in the tables width and within a few seconds I had print
out available. Having made a template for one edge from the values I decided that
it was too curved and returned to the PC using a smaller difference to the tables
width and a second template made. The result can be seen in my Cabinet making pages.