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Mention BurnTest in docs and in the burn parameter description

This commit is contained in:
Florian Festi 2019-10-19 12:29:56 +02:00
parent cfbcbb065c
commit b0b35d6084
2 changed files with 8 additions and 3 deletions
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2
boxes/__init__.py
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@ -277,7 +277,7 @@ class Boxes:
help="print reference rectangle with given length (zero to disable)")
defaultgroup.add_argument(
"--burn", action="store", type=float, default=0.1,
help="burn correction in mm (bigger values for tighter fit)")
help='burn correction in mm (bigger values for tighter fit). Use BurnTest in "Parts and Samples" to find the right value.')
@contextmanager
def saved_context(self):

9
documentation/src/usermanual.rst
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@ -70,10 +70,10 @@ basically the radius of the laser - or half the width of the laser cut.
The value of the burn parameter depends on your laser cutter, the
material cut and the thickness of the material. In addition it depends
on whether you want the parts to be over or under sized. Materials
that are spongy like wood can be cut oversized (larger burn value) to
that are spongy like wood can be cut oversized (larger burn value) so
they can be press fitted with some force and may be assembled without
glue. Brittle materials (like Acrylic) need to be cut undersized to
leave a gap for glue.
leave a gap for the glue.
**Note:** The way the burn param works is a bit counter intuitive. Bigger
burn values make a tighter fit. Smaller values make a looser fit.
@ -82,6 +82,11 @@ Small changes in the burn param can make a notable difference. Typical
steps for adjustment are 0.01 or even 0.005mm to choose between
different amounts of force needed to press plywood together.
To find the right burn value cut out a rectangle and then meassure how
much smaller it is than its nominal size. The burn value should be
around half of the difference. To test the fit for several values at
once you can use the **BurnTest** generator in the "Parts and Samples" section.
format
......