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Post by puterjames on Feb 28, 2019 2:00:01 GMT
Hello,
In the M3 assembly instructions FAQ, I didn't seem to find the answer to the below question, so here it goes...
As of right now, I have everything assembled and everything looks to be squared away, however there is one issue that I have continually been running into. It appears that the belt tension is not sufficient enough for movement of the "Z", which basically does not even allow me to jog in the upward direction. The router basically skips upward and then immediately falls back down to its original position. I have tried to play with the belt tension by trying out different tensions, but no matter what I still end up with the same issue. The best case that I have encountered was that the router did successfully jog upward, but eventually the zip tie on the topmost anchor point would seemingly fall a bit, resulting in the belt system to loosen. Any help with this would be greatly appreciated.
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Post by Derek the Admin on Feb 28, 2019 2:37:38 GMT
The Z axis should actually be the easiest axis to bring into tension. Are you certain that you have it router correctly?
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rowiac
Full Member
Posts: 230
Location: California
Machine: M3
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Post by rowiac on Feb 28, 2019 4:25:14 GMT
The ziptie should not move if you have the belt attached correctly. The teeth of the belt should mesh with each other after wrapping around the anchor point. The ziptie just holds the teeth together. As long as the ziptie is reasonably tight, it really holds well.
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Post by puterjames on Mar 1, 2019 21:03:07 GMT
I've checked the belt's routing multiple times, and it is correct. I have meshed the teeth of belt together and ziptied it together multiple times and am still getting this issue.
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Post by Derek the Admin on Mar 1, 2019 22:58:12 GMT
You don't have something set up quite right then. The M3 has been around close to 3 years with the belt routed this way on every model. I suspect you are not pulling it tight enough before setting the zip tie. It may be useful to have a helper for you to pull it taught while they tighten the zip tie.
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Post by Bruce on Mar 3, 2019 2:58:40 GMT
Maybe post a picture of your Z belt routing, or a video of your problem.
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Post by Derek the Admin on Mar 3, 2019 3:54:52 GMT
I concur with Bruce. We'll be able to better help once we see this.
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Post by puterjames on Mar 3, 2019 17:20:11 GMT
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Post by puterjames on Mar 3, 2019 17:28:29 GMT
The routing of the belt is not the issue I believe. The tension of the belt after cinching down the final zip tie on the second, topmost anchor point, is not the issue either (IMO). Hopefully the video helps. Thanks guys.
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Post by Derek the Admin on Mar 3, 2019 17:54:52 GMT
Can you visually confirm it is jumping cogs on the pulley? The behavior I see in the video tells me it's one of three things: belt is loose, the pulley is not tightened to the shaft and it is spinning, or the driver is acting weird.
If it's the first one and the belt is routed cotrrctly there is literally nothing to do but for you to tighten it more. If it's the pulley slipping on the shaft then you need to tighten the set screws, making sure that one of the screws is on the flat of the motor shaft. If it's the third we need to swap in the spare driver in that position.
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Post by Bruce on Mar 3, 2019 21:19:58 GMT
Maybe a cog of the belt is broken loose, or a completely gone causing a gap in the belt?
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Post by puterjames on Mar 3, 2019 23:10:46 GMT
Well, here's an update. I have checked the set screws to ensure that one of them is sitting on the flat spot of the shaft, and it was. While I was at it, I tightened both of them up. I also removed the Z driver and put the spare one on, tightened the belt back up, and still had the same issue.
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rowiac
Full Member
Posts: 230
Location: California
Machine: M3
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Post by rowiac on Mar 4, 2019 1:48:51 GMT
I can't tell from your video, but do you have the coil extension spring installed on the z-axis? It should be pretty stretched out when the router is all the way at the bottom, and it takes some of the load off of the motor. If the spring is not there, maybe the motor doesn't have enough torque to lift off the bottom.
Also are you sure you adjusted the driver voltage to 0.6V and that the jumpers are set per the instructions?
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Post by puterjames on Mar 4, 2019 15:49:49 GMT
Sorry the picture got rotated... however...the spring has been installed, and I checked the drive readings again and they all come out to .6 V. Also, as you can see in the photos, the jumpers have been properly installed as well.
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Post by Derek the Admin on Mar 5, 2019 4:41:21 GMT
It looks to me like the drive pulley on the motor is very much out of plane with the rest of the pulleys. You should be able to look down the Z stage abd see the belt stayiht on close to the same plane.
I say this because it's unusual for the shaft if the Z motor to stick out paste the pulley.
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