Test of fishing string drive. Will eventually be a H-bot machine but for now i tried a single motor and the results were very promising. As a side note the rattling is from the C-clamps
Are you not afraid of losing steps using the fishing line instead of GT2 belt?
What did you use as the pulley? Mine is getting all tangled
@Ariel_Yahni_UniKpty its just polycarbonate i was careful to make sure they were not overlaping each other.
@funinthefalls so far this is just a motion test once the brackets are more properly mounted i will do speed and accuracy tests. The test in the video has 4 wraps i may use 5 to be a bit safer.
I suppose if you were interested enough you could calculate the force required to make it slip given. I may run through the calculations at some point but for now i think a shake down sounds much more interesting 
worst case i buy enough xl belt as i have a few 10 tooth xl pulleys but not enough belting. Also the bearings will eventually need upgraded as some of them came from old roller blades 
and eventually i will need to make eccentric adjustment spacers too right now i have everything on a fixed pattern that i found through testing
I see where you are coming from. Personally though, I would just use belts to start with, they are not that expensive. But best of luck in your project!
Got to find where to source such aluminum beams !
Fishing line is elastic to prevent it from snapping and elasticity is the enemy of CNC motion systems.
Not with spectra
@Henrik_Larsen @Ariel_Yahni_UniKpty is right this is braided spectra poly line 65 # test very low stretch not elastic like mono filament. Initial tensioning is done then a shake down then re-tension and it should be good.
@Jeremie_Tarot i was extremely lucky to find those. They were throwing out an old server rack at work and i grabbed it up (with the proper paper work of course 
).
You’re good then
I should probably mention also that the intended mode of operation will be a laser engraver and tje motors i have here are not capable of extreme acceleration so all in all low force and reasonable acceleration rates the string drive should work perfectly
So can’t you move the gantry even a little when the motor is holding. I’m asking if there’s elasticity in the wire.
I haven’t been able to get back to this yet but initial tests show very little to no elasticity in the string. The biggest thing is surface contact and friction between the string and the drive pulley.
Amazing, as I dont know that kind of wire. But it’s very good, and cheap I guess.