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Egg measurements are difficult to predict #51

Closed GoogleCodeExporter closed 8 years ago

GoogleCodeExporter commented 8 years ago 
It seems the vertical and horizontal measurements are trial-and-error -- this 
is very time and resource consuming.

It would be super helpful to have inkscape templates that are sized for ovals 
and baseballs (small & large eggs, as well as golf balls and baseballs).  That 
way, one could better predict what the sizing needs are.

Original issue reported on code.google.com by eric.pat...@gmail.com on 2 Apr 2012 at 12:43

GoogleCodeExporter commented 8 years ago 
This is a topic that we have spend a lot of time thinking about, and I do not 
believe that this suggestion is a useful approach.

The horizontal measurements are fixed; there are 3200 steps per revolution, 
regardless of other factors.

For the vertical measurements, please refer to our documentation for additional 
tips about setup: 
http://wiki.evilmadscience.com/Framing_and_Pen_Centering

It is generally very straightforward, using the standard method, to determine 
the available plot distance for any given setup.  Once you learn the technique, 
we have never found it to take more than 2-3 tries (about 1-2 minutes) to find 
the available range for a given setup, and we have never found the range to 
vary once it is established for a given setup.  Furthermore, it need not be 
"resource consuming" -- the test marks can be made on a piece of paper or 
removable masking tape on the surface, so that no eggs (or other media) are 
consumed in the testing process.

The vertical plot distance available is affected by the following factors in a 
given setup, amongst others:

- The type of Eggbot that is being used
- The type of pen that is being used
- How the pen is mounted in the Eggbot-- whether it's gripped near the top or 
near the tip
- The angle of the distal pen arm with respect to the proximal pen arm.
- The equatorial diameter of the object
- The aspect ratio of the object
- The type of egg couplers that are being used
- The pen motor aspect ratio choice

Because of the number of factors affecting this, a template-based approach 
would simply not make sense for most cases.   If we had released a template 
"for chicken eggs" or "for golf balls," I honestly expect that it would have a 
significant negative effect:  those templates would create a lot of 
frustration, by creating the expectation that the template would save some 
setup time.   It is almost always better to save time by just setting up the 
Eggbot correctly the first time, and knowing how to do this quickly.

There are some cases for which a specific template might make sense-- a 
baseball stitch template (if provided with instructions for use) could be quite 
handy.

Original comment by windell@oskay.net on 2 Apr 2012 at 1:14

GoogleCodeExporter commented 8 years ago 
Hey,

Thank you for the quick reply.  I'll take the time to learn it -- but I
still think an initial drawing with lines showing some time of comparison
between 3200 and the revolution would help to engage your customers.  Or
something similar.... an actual visual is important when figuring out
spatial coordinates.

Eric

Original comment by eric.pat...@gmail.com on 2 Apr 2012 at 1:19

GoogleCodeExporter commented 8 years ago 
I'm not sure what you mean by "some time of comparison" -- our standard 
template does have a 3200 pixel width.

Original comment by windell@oskay.net on 2 Apr 2012 at 1:41