|
Post by jpjavery on Nov 29, 2020 22:51:56 GMT
I will give that a try, Bruce! I am a little skeptical as to if that will help or not, if only because of the small area where it is binding. Wont hurt to try though, and if this last try fails, I will give support a call.
Thank you for the suggestion!
|
|
MajorFrantic
New Member
Mega V 35"x35", 4th Axis, 44w OctoPro Laser
Posts: 33
Location: Nashville, TN
Machine: Other
|
Post by MajorFrantic on Dec 2, 2020 2:58:17 GMT
I'll second the extra shim for more adjustment. I couldn't get my X-axis to stop binding when going left, no matter how I loosened the rails.
I put in an extra washer between the Z-plate and the X-stepper plate.
It worked immediately.
|
|
|
Post by jpjavery on Dec 2, 2020 16:13:07 GMT
I hope it works. I ordered the washers, they will be here Friday, so I will install them Saturday.
|
|
|
Post by Bruce on Dec 4, 2020 3:45:56 GMT
I ended up using the precision shims when I too found a second washer fixed the issue, but then there was too much play between the pinion gear and the rack. (like 2mm movement when the motors were on with holding torque.) The precision ring shims did the trick.
|
|
|
Post by jpjavery on Dec 4, 2020 20:24:38 GMT
Well, hats off to Bruce (and MajorFrantic) for the precision ring shim trick. I was skeptical because of how localized the problem was on my X axis, but with one set of shims, it no longer stutters or catches at that point at all, regardless of speed (slower speeds made it worse, it would sometimes get stuck going left to right at this spot while homing) and it rides much smoother. I am going to see how this handles a precision carve, and if it starts riding rough at all, try one more set and see if that smooths it out even more.
Thank you Bruce, I really appreciate the help!
|
|
|
Post by tliechty on Jan 2, 2021 15:35:32 GMT
I'm curious if anyone knows why adding the precision shim fixes the binding? It sounds like jpjavery did a good job trying adjusting the rack further from pinion. Adding the shim seems like it would do the same thing as well? Maybe adding the shim causes the rack to be able to sit better on the T slot, to where it is more vertical?
|
|
|
Post by btreichel on Jan 2, 2021 15:54:20 GMT
nope, just adjusts the clearance between the rack and pinion.
|
|
|
Post by mjsnauko on May 4, 2021 23:41:18 GMT
I spent some time playing with the distance between the rack and pinion, and learned this: If I have the rack farther from pinion it is quieter when rapid traversing but more play, if closer more noisy, but less play. I thought once when I heard a more quite traverse I was done, but realized the play. A good test for me was to tighten one bolt on the rack, move pinion to that bolt, turn on the system on to lock the motors (no need to connect to software), then put pressure on the motor with your hand parallel to the rack. If it wiggles back and forth then you need to bring the rack closer, if it does not wiggle then your either done or the rack needs to move further. Try moving it to a few distances, testing each until it's just close enough to where there is little to no wiggle. Once one bolt was at desired distance, I measured with a caliper, and replicated distance on others to +-.0025" if I remember right. Not sure if this helps or not, but it's what seemed to work for me. I posted a video of what mine sounds like: youtu.be/HGJ7lSQFP6kDo you have a measurement from the support rail to the outside teeth on the rack? I'm coming up with .28" I put an extra washer on the motor mount because of binding. I'm wondering if I need to reduce that gap. I have a little play in the motor when moved by hand. Thanks
|
|
|
Post by tliechty on May 29, 2021 23:03:43 GMT
Hi mjsnauko, I'm getting 0.289" if measuring right...seems pretty close. Its hard to get my caliper to rest on the outside teeth. I typically measure on the flat side of rack and pinion to other side of gantry and am getting: 1.557", however I anticipate that will vary based on if you have washer/not, and also tollerance variance from machine to machine or from where the motor sits in the mount, etc. Once I thought I was binding, but it was just motor skipping from cutting into Oak and going too fast ...Its been pretty smooth sailing once I got the feed rate right and racks all lined up.
|
|