Ballsscrew support help

[andy_con]

So I had a bearing starting to make a noise on the Y so rather than leave it, I got onto it and change both bearings.

But something isn't right as the new ones make a horrible grinding/squeeking noise from day one with zero hours use on them. I assumed I had put things back wrong.

Got some new bearings, took things to bits and replaced them again, making sure I didn't damage anything and putting everything back correctly.

But again from day one they are making the same horrible grinding/squeezing noise.

Is there some special method of installing bearings or ball screw support that im not aware of? Im clearly doing something wrong

[routercnc]

So I had a bearing starting to make a noise on the Y so rather than leave it, I got onto it and change both bearings.

But something isn't right as the new ones make a horrible grinding/squeeking noise from day one with zero hours use on them. I assumed I had put things back wrong.

Got some new bearings, took things to bits and replaced them again, making sure I didn't damage anything and putting everything back correctly.

But again from day one they are making the same horrible grinding/squeezing noise.

Is there some special method of installing bearings or ball screw support that im not aware of? Im clearly doing something wrong

Does it vary with speed? Steppers can emit squealing noises at different speeds (usually low speeds) and this travels down the ballscrew and can sound like it is coming from the bearings. Steppers are driven by pulses so this can happen as a result. Do you have a recording you can upload?

[routercnc]

Suppliers put different bearing in, sometimes standard, sometimes deep groove, so it’s possible they have put the cheapest they could find . Are they noisy when you spin them in your hand (before installing)? You can feel poor quality as a first pass. If not then back to the steppers. Are you microstepping? This can make them run smoother at the expense of some loss of torque. Vary the microsteps and try again. Depending how it is defined in the units on the driver case 1600 is a fair start point

[m_c]

If it wasn't making a noise originally, then it's unlikely to be anything stepper related.

Now don't take offense at the following questions, but I like to cover the basics.
What bearings did you fit?
Support block should be two angular contact 7xxx series bearings, not standard deep groove 6000 series.
And did you fit the bearings the correct way around, with outers races opposing/inner races facing?
And did you adjust the preload correctly?

[andy_con]

If it wasn't making a noise originally, then it's unlikely to be anything stepper related.

Now don't take offense at the following questions, but I like to cover the basics.
What bearings did you fit?
Support block should be two angular contact 7xxx series bearings, not standard deep groove 6000 series.
And did you fit the bearings the correct way around, with outers races opposing/inner races facing?
And did you adjust the preload correctly?

No offence taken, this was kind of what I was getting at.

Original bearings on the right are 6001Z, they do not look like angular contact bearings.

They have been replaced with skf e2.6001-2z bearings.

[andy_con]

Does it vary with speed? Steppers can emit squealing noises at different speeds (usually low speeds) and this travels down the ballscrew and can sound like it is coming from the bearings. Steppers are driven by pulses so this can happen as a result. Do you have a recording you can upload?

Its not the stepper sadly

[Lee Roberts]

If it wasn't making a noise originally, then it's unlikely to be anything stepper related.

Now don't take offense at the following questions, but I like to cover the basics.
What bearings did you fit?
Support block should be two angular contact 7xxx series bearings, not standard deep groove 6000 series.
And did you fit the bearings the correct way around, with outers races opposing/inner races facing?
And did you adjust the preload correctly?

This is what i was going to post, I'm going to say 100% on the bearing's and:

And did you fit the bearings the correct way around, with outers races opposing/inner races facing?

To clarify the Bearings, in back to back configuration:

Back-to-Back angular contact ball bearings provide a rigid, high-capacity arrangement capable of supporting heavy radial loads, tilting moments, and axial loads in both directions.

These bearings are ideal for applications requiring precise axial positioning, such as spindle bearings or high-precision machinery, with load lines that diverge towards the bearing axis, increasing stiffness.

Key Features & Advantages of Back-to-Back (DB) Bearings
High Rigidity: Excellent for supporting overturning moments, suitable for high-speed precision applications.
Bidirectional Axial Load: Handles axial loads in both directions, where each bearing handles one direction.
Matched Sets: Often supplied as a set (e.g., 7005CD/P4ADBA) to ensure precise preloading and accurate assembly.
Common Back-to-Back Arrangements/Designs DB (Back-to-Back): Designated by "DB" (e.g., 7005CD/P4ADBA), with load lines diverging.
Double Row: The 3200 and 3300 series are standard options.

.

My advice is, don't by cheep ones, I've had to buy proper radial bearing shims in the past to get them preloaded properly...

Single row deep groove ball bearings vs single row angular contact ball bearings.

[m_c]

7001 bearings don't seem to be that common. Probably be as cheap buying a new BK12 from a reputable supplier.

Lee, I think I got my description the wrong way around.
It's been a while since I've had one apart, and I've been doing far more wheel bearings lately, although fitting them that way would let you set preload via the nut provided there is enough clearance between the inners.