Verification record of Y-axis and Z-axis bump (impact sound)

Snapmaker 2.0
1

Verification record of Y-axis and Z-axis bump (impact sound)

I currently have 6 linear modules, and I am at a loss to solve the bumping sound of Y and Z axis with any combination.

The A250 assembled with the combination that seems to be optimal generates bumping sound like this.

Changing the combination results in a much worse bumping sound.

Attached is the result of measuring all the linear modules.
From this, we can see that the best way to eliminate the bumping sound is to prepare two of the same dimensions.

Even so, if there is yawing in the rotational direction due to separate fixation or other reasons, or if there is an oblique inclination to the axis, bumps will occur.

If you are having trouble with bumping noise (bouncing or misalignment due to the impact of the bet), you need to measure the dimensions and select two linear modules with minimal difference each.

In my case, the bumping sound has not been eliminated in all combinationsā€¦

mo
mo1690Ɨ908 106 KB

2

Nice documentation!

The homing position is not that relevant as it seems, if a couple of linear modules is homing the first end switch turns off both.

What you need is the same travel length and if I interprete your documentation right, there is a way to assemble your machine for correct function without bump.

Why do you have 6 linear modules?

3

The linear module was prepared by support due to a single defect.

Unfortunate or fortunate?
While I had 6 linear modules, I measured the dimensions and tried to put them together with the ā€œsame dimensionsā€.

Based on the dimensions of the homing and 200mm movement, the best combination was found, ā€œY-axis: No.2, No.6ā€.
ā€œZ-axis: No.3, No.5ā€, and X-axis: No.1".

As a result, there was no bumping noise before the table or X-axis was mounted and fixed, but after fixing, bumping noise was generated, and as a result, even the best combination did not improve.

To be sure, I measured the distance between the two linear modules and fixed them in parallel so that they would not form a V-shape when fixing the two Y axes to the foundation plate, but the result was not improved.

Discussion
Is the foundation base twisted?
Is the mounting bracket of the linear module twisted in the direction of rotation and fixed?
Accuracy of the ball screw?

Since I donā€™t have a surface plate and height gauge, it is impossible to grasp the problem any further.

I canā€™t solve the problem, I can only laugh now:)

4

Its almost to weak. The linearmodules (at least mine) were also not straight. If I lay them down on a flat area they will wiggle an not laying flat. All togehterā€¦ at this point I must laugh too and have no wordsā€¦

5

I even have no fix, sry, you have to email support@snapmaker.com , i guess.

Maybe this thread helps you to find more accurate linear module couples.
"Bump" in Y-axis - #39 by Snapmik**

6

Wow thats very crazy, must check this by myself. Fortunately I have no bumping or such with my modules jet knock knock knock on wood

7

I have read up on many of the events, including past forum threads.

In my case, it may be that all 6 linear modules are moving at different speeds.

This is a very fortunate (and unfortunate) occurrence.

Physically, the ā€œdifference in travel speedā€ is added to the following causes I have considered for the bumping noise in a combination of linear modules of ā€œalmost the same dimensionsā€.

Discussion
Is the foundation base twisted?
Is the mounting bracket of the linear module twisted in the direction of rotation and fixed?
Accuracy of the ball screw?
Difference in movement speed

The solution to this problem is to measure and combine linear modules of the same dimensions and the same travel speed before shipping.

It is not good for the product if the user has to figure out the solution and deal with it.

I always believe that the safety design should be ā€œinterlockedā€ so that any person can assemble it and it is safe for any operation.

Misconnecting cables, pressing the wrong button.
It seems that a lot of people have experienced this, but I think it can be avoided with a little thinking on the part of the manufacturer.

But I digressā€¦

If the bumping noise of the linear module is not prevented, its life will be shortened and some harm will occur in the near future.

This is also a safety issue in a facility that operates continuously for tens of hours.

If you have the same problem and canā€™t solve it at all, please contact Snapmaker support and donā€™t give up.

I have already assembled, disassembled, and tested the device more than 20 times.
Iā€™m very tired, but Iā€™m trying to fix it because I love Snapmaker.

I donā€™t know when it will be fixed:)

I hope the people in Snapmaker will reflect this in the next version of the Snapmaker 3.0 design philosophy:)

1 Like
8

Iā€™ll write down the subsequent developments.
In case anyone else has the same symptoms and problems.

After a long back and forth with Snapmaker support, we were able to resolve the issue yesterday.

They pointed out that the controller was faulty, so I reconfigured it with a new controller, two Y/Z axis branch connectors and new cables, and checked the A250 operation.

As a result, the bumping noise (impact noise and bouncing) was completely eliminated, and we obtained smooth table movement and stable Z-axis movement.

Since the linear modules are made up of modules with the least error in the dimensions we checked, everything is fine except for the operating noise.

Now we can use every inch of the table without limiting the operating speed.

I would like to report an example of a problem with the controller.