On 10/11/22 19:51, Chris Albertson wrote:
Here is a good table of mechanical properties of 3D printable materials.
PLS actual comes out as very good, except for durability because of its
typical failure mode, it breaks rather than deforms.
https://www.simplify3d.com/support/materials-guide/properties-table/
I'll still repeat that good design is FAR more important than selecting
some magic materials. A redesign can many times net a 10x or more
improvement but swapping materials can only get an incremental increase.
Going back to the question, If the goal is dimensional stability, the best
solid un-filled plastic is PLA, the stiffest is carbon-filled PLA but the
carbon stuff is not as strong and dose not save weight. over plain PLA.
Which surprises me.
If you want a "tough" plastic that does not shatter then you want something
flexible. But that was nt the question asked here.
True, but shatterproof because it its resilience make PETG a good deal
for the price.
Nylon or PC would be best but doesn't print that well in consumer printers.
My walking robot is made from PLA and motors with hardened steel gears.
The biggest design issue I'm having is the gears are wearing out too soon.
But large gears are over my budget
One thing I've found that might be helpful in printing bigger stronger
gears, is grinding
a bigger flat on the motor shaft then printing the gear to be a hard
push fit on this bigger flat.
Don't need a metal hub with grub screws in the gear. My B axis on my
6040 mill is a small 5/1
worm drive from fleabay, has an 8mm to 11mm adapter I printed while
waiting for the metal
one from China. With a 3 phase, 3NM motor spinning it, the plastic piece
is still working several
hundred spinning hours hours later as I carve these vise screws.
Take care & stay well Chris.
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
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