Y wheel setting procedure

Tools required 

You will need the following tools for maintenance:

A: T25 torx

B: 10mm spanner

C: Wheel setting tool

D: 4mm hex 

Lower beam preparation

You will need to access your Lower X Beam before you can do any changes to the Y axis wheel setting. Click here to learn more.

Set motor height

The motor is set so the pinion meshes with the rack. However, when doing maintenance, you will need to lower the pinions slightly. This will prevent damage to the rack and pinion. 

As an indication, if the motor is raised as shown in the picture this means the pinions are meshing into the racks.

To lower the motor pinion, slightly unscrew the hex bolt using a 10mm spanner on both sides of the beam and slacken off the 4mm hex socket at the top of the motor.

Level the raised edge parallel to the mounting plate, so the distance between the two becomes zero. This will move the pinions down meaning less resistance will be required to push or pull on the Lower X Beam.

D: Mounting plate

Check wheel plates

Check the lower wheel plates are parallel to the motor mounting plate. If the plate is not set at an even distance or it’s angled then this will wrongly set your Lower X Beam and put pressure on the wheels as a result they wear out quickly.

E: Wheel plate

We recommend using a set square to check the wheel plate is square to the Lower X Beam extrusion.

If you find that the plate is not parallel or is loose, then unscrew the CSK bolts and set the plate to match the squareness to achieve parallel gap. Retighten the CSK bolts to secure the plate. These bolts have blue loctite applied so may be more difficult to remove than expected.

F: Set square

G: CSK bolts

Wheel setting rules and procedures

Step 1: Setting the initial wheel position

Before setting wheels, position them according to the chart shown below. We have also given an identity to the wheels, for example, 1st row wheels are called wheelset one, 2nd row wheels are called wheelset two, etc.

When setting Y wheels, always start with this chart and position your wheels accordingly.

Step 2: Set preload on wheelset 1 

Before loading the wheels into the channels, move the cam to ensure that both sides have an equal amount of preload. When you insert the beam, a light pop will ensure the correct fitting.

Check the following:

  • Insert the Lower X Beam into the channels and feel the resistance.

  • If you feel too much resistance, then you have to reduce the preload by slightly rotating the cam clockwise away from the channel wall. 

H: Wheelset 1

Step 3: Set preload on wheelset 3

After setting preload on wheelset 1, skip wheelset 2 for now, move on to wheelset 3 and apply the same principles as you have done for wheelset 1.

H: Wheelset 1

J: Wheelset 3

Check for squareness 

When checking for squareness against the Lower X Beam plate, pull the beam from the centre and align both the Y Bench and Lower X Beam plate so that they are parallel

If both left and right plates match then you have achieved squareness.

If either of the wheel plates doesn’t match, for example in the image below, the right side plate is sitting slightly proud of the Y Bench end plate compared to the left side plate. 

If you encounter this issue or vice versa then you have to do minor “equal and opposite” adjustments on wheelset 3 which you have preloaded.

A general rule of thumb is:

  • If the side is minus: reduce preload on that wheel 

  • If the side is plus: add preload on that wheel 

  • Do an equal and opposite adjustment to the other side to maintain preload

For the case below:

  • On the right side plate (plus): add preload on wheel 3 for that side only.

  • On the left side plate (minus): reduce preload on wheel 3 for that side only.

  • Then check the beam for alignment. If the plates align then proceed to step 4 or keep doing the adjustments until both the plates are aligned.

Step 4: Set preload on wheelset 2

Now we will apply preload on wheelset 2, note that they run on the outside of the channel. Also when you apply preload on wheelset 2, it's likely that the preloaded wheelset 3 might be hard to get into the channels. If so, reduce the preload by small, equal amounts on both sides of wheelset 3 until you can insert into the Lower X Beam without needing excessive force.

H: Wheelset 1

I: Wheelset 2

J: Wheelset 3

Check approach on wheelset 3 

Once preload is added on wheelset 2, you need to check if both wheelset 3 axle bolt centres approach the bench end plate at the same time as shown in the image.

If either of the bolt centres do not approach at the same time, for example, in the image below, the left side bolt enters the channel before the right side,  then you have to do minor “equal and opposite” adjustments on wheelset 2.

Note this setting is opposite to squareness.

A general rule of thumb is:

  • If the bolt centre is minus: add preload on the wheelset 2 on this side 

  • If the bolt centre is plus: reduce preload on the wheel 2 on this side 

For the case below:

  • On the right side bolt (plus): reduce preload on wheelset 2.

  • On the left side bolt (minus): add preload on wheelset 2.

  • And check the bolts centre for approach. If both the bolts centres enter the bench end plate at the same time then proceed to step 4 or keep doing the adjustments until both the bolt centres approach is the same.

Step 5: Re-set preload on wheelset 3

Once you are happy with the bolt centre approach on wheelset 3, the next step is to check the beam plate for squareness as we did after setting the initial preload on wheel set 3. Follow the same procedure as mentioned in the check for squareness section. 

Do not change the setting on either wheelset 1 and 2.

Step 6: Set preload on wheel 4

To set preload on wheelset 4, simply insert the Lower X Beam into the channels so that your finger can access the wheel for rotation. Initially the wheels will rotate as they were set for zero preload. 

Start applying preload on wheel set 4 as shown in the image. 

H: Wheelset 1

I: Wheelset 2

J: Wheelset 3

K: Wheelset 4

If you can insert the Lower X Beam by using your thumbs (and feel slight resistance) this indicates adequate preload. 

Once you have applied the preload, check whether the wheelset 4 spins or not with your thumb. If it does then you have to slightly increase the preload by an equal amount on both sides and re-check for spin.

Do not change the setting on either wheel set 1, 2 and 3.

Check for squareness

Once you are happy with the preload on wheelset 4, the next step is to check the beam plate for squareness. Usually this will be set but if not then follow the same procedure as mentioned in the check for squareness section and only adjust preload on wheel set 4.

Don’t change the setting on either wheelset 1, 2 and 3.


 

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