How firm should the Y axsis slide?
Hi, I'm currently building my i3 mk2, the Y axis is done and it seems perfectly squared, everything line up perfectly and the belt is nice and tight like it should be. But should the bed slide freely when I tilt the frame or is it normal that it stand still like mine? It seems to slide fine when I push it.
Thanks! 🙂
Re: How firm should the Y axsis slide?
Hi, I'm currently building my i3 mk2, the Y axis is done and it seems perfectly squared, everything line up perfectly and the belt is nice and tight like it should be. But should the bed slide freely when I tilt the frame or is it normal that it stand still like mine? It seems to slide fine when I push it.
Thanks! 🙂
If the motor is in place, and the belt is looped over the Y-motor pulley, and the pulley is tightened on the motor shaft, it won't move without pushing due to resistance from the motor.
Re: How firm should the Y axsis slide?
What about if the motor and belt are not attached? If I just put a bearing on the smooth rods and try to slide the bearings there is some resistance. It doesn't take much force to make it move, but I also wouldn't call the action silky-smooth either, and there's a noticeable transition between the static fiction and kinetic friction. It's more like a Home-Depot lazy-Susan bearing that a Fidget Spinner bearing. If that's the way it's supposed to be I'm not complaining, but I thought I'd ask in case it's supposed to be silky-smooth.
Thanks!
Re: How firm should the Y axsis slide?
*The bed is somewhat hard to pull/push when fully assembled - but it should be the same resistance over the whole stroke from max to min or vice versa. If there are spots on the rods where you can feel a different motion compared to other spots - then maybe the bearings/rods are not so good (useful but not perfect).
*The stock bearings are probably not top notch - maybe in the low price range (few $ a piece) - compare that with SKF LM8UU (20$ a piece). Read the following interesting discussion of rods and bearings - http://shop.prusa3d.com/forum/original-prusa-i3-mk2-f23/replacement-bearings-recommendation-t2085.html .
*My rods for the x-axis (machine from mid 2015) are a bit wavy when pressed against a very precisely machined steel ruler from Japan. The waves are hardly noticeable by looking into a brite light and try to see through the small column between the ruler and the rod. This can be felt when moving the x-axis from one side to the other - the waves propagate from the rods and bearings to the hand and the motion is just a little bit jerky.
/Henrik