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Post by maikeru on Jun 15, 2021 3:32:08 GMT
Hi folks,
I've got everything assembled and I was making some cuts and it seems the X & Y axis is having some issues but mostly in the Y axis. I can hear grinding like noise when the gantry is going towards home or -Y direction (that's the back of the machine right?). If the picture comes out right, you can see it offsetting as it's going down the project.
ok it's not letting me do the attachment as the forum is full. so here's the link
By the time the project was done, it was a couple mm off.
When it's off, I can pull the gantry towards me in what seems like a fairly smooth motion, but when pushing it away, it catches here & there. There's one spot it "almost" always gets stuck at but not every time. and by stuck, I mean I have to push it with some force, maybe 30 lbs of force or so to get it going again then it's smooth in parts and choppy in others. but always in the -Y direction.
I tried re-seating the motor and rack thingy the motor gear sits in on both sides. I think I may have gotten it a hair smoother, but it may just be my imagination as it still catches in places on the way back (never forward towards the front of the machine).
As for the X:
The X axis seems pretty smooth, but it's not the same resistance all the time. like as if the motor is getting tense/tight, but never catches on anything. Only thing of note on the X axis is the bottom left wheel isn't really gripping the underside of the rail. If I push up on it it will, but only top two and bottom right wheels are completely spinning when going left & right, will that affect anything? I don't see how I can make those wheels pinch the rail better...
Cheers, Mike
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Post by kevin on Jun 16, 2021 3:35:09 GMT
It sounds like you are having issues with the gear rack binding in the area you mentioned. With the power off, loosen the screw on the gear rack nearest the area of the bind and then traverse the gantry by hand to see if it still binds in that area. If the bind is eliminated tighten the screw and traverse the gantry the entire length of the rack by hand to make sure there is no more binding. If you still have binding, move the gantry to one end of the rack then loosen all the rack screws on the side that is binding. Move the gantry by hand along the gear rack; with the screws loose, the rack should position itself appropriately relative to the pinion gear. Tighten the rack screws as you move the gantry by hand past each screw. Once you reach the end of travel all screws should be tightened. Now traverse the gantry back and forth by hand several times to make sure the bind is eliminated.
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Post by maikeru on Jun 18, 2021 3:23:50 GMT
Hi Kevin, thanks for the help.
I redid the gear racks a few times and I think I finally figured out the sweet spot for the gears and the wheels and their tightness. at least it sounds so much better when I did a dry run.
I'm going to try a new cut and see how it goes.
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Post by btreichel on Jun 18, 2021 4:17:06 GMT
Now give it a little dry lube.
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Post by maikeru on Jun 18, 2021 18:59:36 GMT
Have you found a dry lube you like?
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Post by maikeru on Jul 12, 2021 5:23:24 GMT
It sounds like you are having issues with the gear rack binding in the area you mentioned. With the power off, loosen the screw on the gear rack nearest the area of the bind and then traverse the gantry by hand to see if it still binds in that area. If the bind is eliminated tighten the screw and traverse the gantry the entire length of the rack by hand to make sure there is no more binding. If you still have binding, move the gantry to one end of the rack then loosen all the rack screws on the side that is binding. Move the gantry by hand along the gear rack; with the screws loose, the rack should position itself appropriately relative to the pinion gear. Tighten the rack screws as you move the gantry by hand past each screw. Once you reach the end of travel all screws should be tightened. Now traverse the gantry back and forth by hand several times to make sure the bind is eliminated. ok I redid all the racks and the concentric spacers and got it to where it was pretty smooth. I cut a few things and it looked great. Then I noticed there's one spot on the right Y side near the back ( really close to the first screw on the gear rack from the back) that it makes a loud grinding sound on but it's only when traversing towards the back. when moving towards the front it doesn't make that grinding sound. It's one spot on the right, the same place every time like it's skipping a gear tooth. I checked the rack to see if something was stuck in the gears there but nothing.
I also noticed the wheels are no longer all spinning the same so I re-adjusted them. I'm guessing I'm either too tight or too loose and it's getting misaligned as I cut?
Would love some thoughts from someone more experienced with this 
Would it help if I made a video with audio? |
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