Last modified: 2024-12-13 22:45:38
< 2024-12-123d-printed coefficients of friction study
I have eSun PLA+ (white), Bambu ABS-GF (grey), and Polymaker PC-Max (black) test samples.
Firstly I'm going to record the weight of the empty bucket, and the weight required in the cup to allow me position the sample so that it doesn't slide, and then keep adding weight until I am no longer able to position the sample so that it slides.
Lower sample layer lines in direction of motion, upper sample layer lines perpendicular.
Empty bucket is 7.58 g.
And the test samples weigh:
This gets coefficients of friction:
Typing results in here is pointless, I'm moving to a spreadsheet. data-20241213.ods in
the NAS CAD friction-testing dir.
One idea would be to put some sort of vibrator on the table so that there is less randomness in whether or not it breaks friction.
New methodology is to bang the table with my knuckles. If it doesn't slip on the first bang then that is the small weight. If it doesn't slip after 3 bangs then that is the large weight.
With more weight in the cup, and with the banging thing, I got:
The only thing I can conclude so far is that the material you use doesn't really matter very much, even if it's ABS-GF, which is surprising because I thought ABS-GF would be much rougher.
I think we can say:
To 1 significant figure, the coefficient of friction of PLA, ABS-GF, and PC-Max, as printed by the Bambu X1 Carbon on default "0.20mm STANDARD" settings", with layer lines rubbing against layer lines perpendicularly, the coefficient of friction is about 0.1.
If 0.1 is accurate then I am quite happy about that. That is lower than I expected, good for the clock.
This paper did some more thorough tests: https://revmaterialeplastice.ro/pdf/19%20CHISIU%201%2021.pdf - they found much higher coefficient of friction than me though.
Still todo: