Play in the gearboxes of all step motors
Hi everyone,
I mailed Chris about this issue and he told me that it is normal for these low-cost motors to have some play in the gearbox. The question is - are there any better quality motors that I can mount on the arm without big modifications? Please see this video and tell me if it is normal to have this amount of play: https://photos.app.goo.gl/JbkGkzq95JAdzVzVA
I would like to have approx. 0,3 mm repeatability and I'm not even close to that, even with the fine calibration and keeping the arm under constant weight. I checked all connections with the shafts, belt and chain tensions, everything is really nice and tight, on every axis.
Thanks in advance
David
photos.app.goo.gl
photos.app.goo.gl/JbkGkzq95JAdzVzVA
Thanks for the reply. The belts and chain are quite tense. There is also a lot of play at J2. By "constant weight" I meant that the arm is never perpendicular to the table - the gravity pulls it constantly downwards. I want to move some PCBs with the robot, so I'm far from 4 lbs. I'm 99.9% sure the play is coming from the gearboxes. Is there no other stepper alternative?
(https://anninrobotics.com/community/questions/play-in-the-gearboxes-of-all-step-motors) Šinko Maybe you will have better luck with gearboxes from Nanotec
3 replies
Chris Annin
from the pic it looks like movement is coming from J1, 3 & 5. After some break in I would try increasing belt and chain tension. I cant tell how much force is being exerted or if the movement is gear backlash or belt stretch but keep in mind max lift is around 4lbs.