J4 TIMING HUB does not match with 84XL037 timing belt. Most of the 28 teeth of J4 TIMING HUB work fine. Only three or four teeth are not correct. I tried it with a higher belt tension but it doesn't get better.
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- Dear Chris, I am having trouble with the number of amps being inputted into the motors of my AR2 robot, and am concerned about whether or not I need to replace the J3 motors due to the amps being too way high on the motor. For some reason while I was wiring the motors, I was having some of my stepper drivers disabling themselves since there were too many amps being passed through the driver (the red light was blinking every few seconds on the driver). I was experimenting on switching which drivers controlled what motor between the J1 and the J2 (note that I had not wired up all the motors yet, just the J1 and J2 at this point), and found that I was able to control the J2 motor with the J3 motor driver (making sure I flipped the right switches), and determined that I had isolated the problem to the J2 driver. I had then tried to wire the J3 motor into the J4 motor driver with the switches set for J3, and unfortunately, the J3 motor potentially burnt itself out when it started to heat up extremely quickly and eventually start emitting small amounts of smoke. What is causing my motor drivers to alert me about my amperage being too high being though I have the switches set up correctly on the motors? This is my first major robotics project by myself, and I am quite a novice when it comes to writing up electronic systems, especially as complex as a robotic arm control box. Any ideas on how I could fix this problem? I'm not entirely sure where all the extra amps are coming from, and I need some guidance on how to solve it since I don't have much experience in electrical design. Sincerely, Alex
Interesting; I have not seen this issue come up yet. @Ari Hant @Matt Carrier have you guys experienced this? do you have any pictures of how your belts aligned on the J4 timing hub?
I had a bit of hand finish do to poor finish on the hub, but the pitches matched
The belt fits well on the printed version as well as on the aluminum version
here you can see the issue on the right side (the white paper is only for a better contrast)
if i turn j4 timing hub 180° backwards then the issue moves to the left side. I marked this two places in one of the following pictures. The red line is for the right side and the blue line for the left.
Thank you for the pictures - that is very helpful. I should be getting my next batch of parts within the week and as soon as I have them I will check the fit against the stock of belts I have as well as some older belts I still have that I got from a different supplier. I’m wondering if the is an issue with the belts or if I need to have the sprockets polished to reduce the sharp edges on the teeth.
I haven't built enough of it to properly test that built but it does seem like when rotating it in my hands with the belt it isn't going to grip properly. As I rotate it seems to come out of alignment.
I suspect with these being laser cut and no finish work the OD is probably slightly large and the faces and flanks need polished. As soon as I get my next batch I will certainly review with different belts as well as some finish work and I will get back to you.
I just received the next batch of parts. The belts fit well on this batch so I am unable to replicate the issue but I suspect variance in cutting equipment and materials. I would recommend using a nylon abrasive wheel along the width of the teeth, polishing not only the OD but the faces and flanks of the sprocket - removing any sharp corners should allow the belt to fit as intended.
Good idea!
I did it. The j4 timing hub is matching now.