Two problems with drilling the holes in the right place on the pivots:
1. Getting the existing straight-through holes in the rotator turned to
45 degrees.
2. Drilling a new hole in the pivot pipe at 45 degrees, in line with the
holes in the rotator.
The first problem is easy to solve. I just used a level with a 45 degree
surface on one of the 2x2 frame brackets and propped the frame in that
position. If I drilled the holes in the rotator in the right position
for holding the frame level, they should now be in the right position
for drilling a 45 in the pivot.
The second problem required a refresher in geometry. I needed a mark 1/8
of the way around the circumference of the pipe from the first hole
(360/8=45). This could be calculated, but I'm not really interested in
the measurement, hence, the geometry refresher.
I wrapped a sheet of paper around one of the 2-1/2 inch (nom.) pipes,
squared it up by making sure the edges lined up where it overlapped, and
marked it along the overlapping end. A line drawn at 90 degrees to that
mark represents the circumference of the pipe.
Using a compass and straight edge, I drew a perpendicular bisector to
that line. If you're a little rusty on that, see these:
http://mathforum.org/~sanders/geometry/GP05Constructions.html
http://www.mathopenref.com/constbisectline.html (requires javascript)
http://en.wikipedia.org/wiki/Bisection
That gave me 1/2 the circumference. Repeat two more times and there's
the 1/8 mark. All it takes then is to wrap the paper back around the
pipe, line up one end with the center of the existing hole and punch a
mark through the intersection at 1/8. Except, of course, I couldn't wrap
the paper around the pivot pipe because of the pipe welded to it that
makes it the adjustable upright.
That's ok, all I needed was enough of the paper to show one end of the
line and the intersection showing where 1/8 the circumference is. That
gives me how far around the pipe to go and it's easy to measure how far
from the end of the pipe the first hole is drilled.
Using a scratch awl and combination square, I marked the centerlines of
the first hole in the pipe. That gave me a way to align the paper on the
pipe so I could punch a mark to drill the hole at the 45 degree
location. That gave me a way to pin the rotisserie at 0 and 45.
The rotisserie was rotated to 45 degrees in the other direction and
supported there. Again, a level was used on the 2x2 square tubing
holding the frame to set the 45 degree angle. In this position, the hole
I just drilled in the pivot pipe became a guide hole for drilling a new
hole in the rotator pipe (refer to the 1st image in journal entry 109).
The new hole would be 90 degrees from the first hole in the rotator. I
just had to make sure the same amount of the rotator pipe was sticking
out from the pivot pipe before drilling.
The procedure was repeated at the other end of the rotisserie to get the
same arrangement of holes drilled into the pivot pipe and rotator pipe
for the other end stand. Each end stand can be pinned at any multiple of
45 degrees throughout a full rotation.
Photo 1: Tools used for getting 1/8 the circumference of the pivot pipe.
That line marked "0" on the left is where the other end of the sheet of
paper overlapped when it was wrapped around the pipe.
Photo 2: Strip cut from the paper in photo 1, aligned with the
centerline marks of the 1st hole. You can see I was off a little when I
punched the mark for drilling the 2nd hole.
Photo 3: A montage of 9 photos, showing the rotator pipe pinned at 0,
45, 90, 135, 180, 225, 270, 315 and back to 0.
(This montage was produced using the program "montage" from ImageMagick:
http://imagemagick.org
The images were named 000.jpg, 045.jpg, 090.jpg, 135.jpg, 180.jpg,
225.jpg, 270.jpg, 315.jpg and the command used was:
montage +frame +shadow +label -quality 85 -borderwidth 4 \
-bordercolor white -tile 3x3 -geometry 256x192+0+0 000.jpg \
045.jpg 090.jpg 135.jpg 180.jpg 225.jpg 270.jpg 315.jpg \
000.jpg 3x3-small.jpg
That's a mouthful, but it's easier for me to just tell it what I want
than to fiddle around with a mouse, dragging and resizing and
repositioning stuff in a graphical program, at least, in this
situation. I didn't want to edit each image, just stick them together
as equal parts of one image.)
(click photo to enlarge)
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