#Scout-CoreXY :: QUESTION :: Is such a high insertion of the routed belts to the X carriage going to affect the stability of the system? Ideally the belts should come in between the two horizontal X rods, at their level as far as my logic has it.
But with this design I can only have it quite high so I thought about asking in the community…
Largely the bearings should withstand any torsional forces being applied here. Ideally, yes - the belt might be routed in the same plane as the rods, but due to space constraints, etc that’s not always an option.
I don’t know how much of an effect it would have. It’s not hard to make it more optimal, see the design I’m working on: https://plus.google.com/+StephanieS3D/posts/czA8bKrLDUT
By the way, the way you have to bearings aligned will not work. As the carriage moves closer to the back the belt will rub and catch on itself.
@Stephanie_A with the size of the blocks, I’m no sure they can can move far enough to rub on itself.
@Stephanie_A
I am aware of that possibility and its caused by the quite small diameters I am working with (16 tooth motor pulley and flanged F694ZZ). I have that in mind for when I’ll do the actual build but its something easy to overcome if it does happen. I’ll just have to use a larger pulley for the outer belt length, maybe even a printed sleeve on the current setup.
@Stephanie_A (“It’s not hard to make it more optimal”)
It’s about the only option I have considering the design. I can only mount the motors the way I do (efficiently) because I’ll be using ALU square tube (not extrusions). I don’t really think that it will have that much of an effect but I am still working on the vertical stacked rods configuration because I like that better than this flat/horizontal carriage.
@Nathan_Walkner
I have 0.9 steppers for all axes so it should be good enough. Smartrapcore uses belt for Z so I am not the first doing it. The belt routing in the sketch I have presented is an experimental thing, a combination of spectra and belt, using the belt for the length that goes over the motor pulley in a complete up-down stroke and spectra for the rest. It can be done with belt only all the same.
This particular configuration will be useful should I decide to do a compound pulley system to double the Z resolution without going into microstepping (discussion here: http://forums.reprap.org/read.php?397,585219,631668#msg-631668)
My anchors are quite high compared to the rods: http://www.thingiverse.com/thing:313095 however, I do have some weight on the carriage, which seems to nullify the pull effect.
In your case, I would alter the design to use long linear bearing to help you fight the pull force, because after all, tour anchors can be seen as levers…
That’s a slick machine but you must have some weight on the X. I am not expecting anything outrageously wrong with the design but wanted to learn the feeling of the community.
Indeed, I max out at 80 mm/s, faster than that, on tight infill I am loosing steps. But I tend to print at 60 mm/s all the time. This is not a production machine, its just for fun.
yeah i know mine will be too an experimenting platform…
