Chopper Skins
I've
made a number of changes to Paul's files:
I
scaled
them up to correct size (his originals were about 1/6 full size),
corrected panel lines that were not vertical or horizontal (most likely
caused by 1 pixel differences during scaling) removed all but one of
the panel lines (there were sometimes 2 or 3 lines on top of each
other, Paul compared drawings from multiple sources to create his
drawing) and I adjusted the top strip to be precisely 1 in and total
skin height of 14 in to cover a body diameter of 18.875 in. For my
convenience, I created several layers in the .dwg file (skin, features,
dim, dim-panels, etc.) so that sections of the drawing that were not being
worked on could be turned off. For these drawings I distinguish between
"panel lines" and "skin features" (things like holes & slots
cut
into the skins). The major dimensional change was moving the
shoulder mounting holes to 4.25 in down from top edge and changing
shoulder mounting holes to 3.25 in diameter (both to match Cleofett's
drawings). To make them compatible with CNC machining, the lines, circles and
arc's that were in the drawing as splines (many small straight lines
that approximate a circle) were converted to true lines, circles and arcs.
That also required making guesses at what the dimensions for the
features really were. Using a table of fractional to decimal
conversions I chose the closest decimal equivalent (in essence,
converted to the nearest 1/64 in fractional measurements). Finally, I added slots ( double lines 1/16" (.0625)
wide ) to replace panel lines [both are available on the drawing file].
I've also created 3D models of the skins using the sheet metal
(preview) features of F360. Links to the F360 models are included
below. Because of their small size the panel lines do not show up well
unless you zoom in on the 3D model. Given the size of the skins
(14x29.65) the .pdf drawings are ANSI D size (34x22) so that, if
you want, you can print full sized skin layouts.
link to .dwg, link to .pdf, link to .pdf with dimensions, link to F360 3D model. This design is copyright Media-Conversions LLC and is made available for non-commercial use only.
Rear Skins