6" Wheels
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Q: What PSI should the wheels be inflated to?
A: Inflate the wheels to the achieve the desired hardness. It is recommended that if used in a drive train, the out wheel should be softer than the center wheel or wheels. This helps with achieving the desired drop in the center.
Issue: Not able to turn with wheels
Possible Solutions:
This can be caused by having not enough center wheel drop in the drive train. If possible increased the center wheel drop distance.
If increasing the center wheel drop is not possible, decrease the air pressure in the outer sets of wheels and increase the pressure in the center wheels. This will do effectively the same as increasing the center wheel drop.
Refer back to the Individual Components page and ensure that all necessary parts are located before starting assembly steps.
These tools are required for the assembly of the Pneumatic Wheel.
SAE/Inch Allen Set
Simple Green or other soapy water solution
Blue Loctite (McMaster P/N 1004A12) is recommended on all bolts that thread into a tapped hole.
The pneumatic wheel options offered by WCP are some of the most popular in the FIRST Robotics competition. The core ideology is to have one hub that can support both 6” and 8” tires. Depending on the game, teams are able to use either wheel size without having to purchase another hub. The hub with adapter supports any 200 x 50mm tire available on the market.
Blue Loctite (McMaster P/N 1004A12) is recommended on all bolts that thread into a tapped hole.
The Pneumatic Wheel Hub will come with the screws and cover plate pre-installed. Before attempting to install the tire onto the hub, the cover plate needs to be removed.
Be sure that the tube is in the tire before trying to put the hub in the tire.
The tire will be a tight fit onto the hub. In order to help with installation, spray the area with a soapy water solution where the tire and hub contact each other. This should help the tire slide on much easier.
The stem in the tube needs to go through the slot in the hub. Also it is recommended that the stem faces towards the cover plate to make filling with air easier.
Simple Green is the recommended spray to use.
It may be hard to get the tire to sit fully on the hub due to it wanting to spring back off.
Once the tire is on the hub as far as possible, get all six #8-32 bolts started. Work around the cover plate and tighten each bolt a little at a time until all bolts are tight.
Be careful not to have the tire pinched between the cover plate and the edge of the hub.
Blue Loctite ) is recommended on all bolts that thread into a tapped hole.
Slide Pneumatic Wheel Hub Adapter onto the Pneumatic Wheel Hub. Align the slots for the tube stem in both components.
Once the hub adapter in installed, rivets may be installed to hold the adapter in place. The recommended rivets can be found on .
The hub does not need to be riveted to the hub. The wheel will still function without the rivets.
The Pneumatic Wheel Hub will com with the screws and cover plate pre-installed. Before attempting to install the tire onto the hub, the cover plate needs to be removed.
Be sure that the tube is in the tire before trying to put the hub in the tire.
The tire will be a tight fit onto the hub. In order to help with installation, spray the area with a soapy water solution where the tire and hub contact each other. This should help the tire slide on much easier.
The stem in the tube needs to go through the slot in the hub. Also it is recommended that the stem faces towards the cover plate to make filling with air easier.
Simple Green is the recommended spray to use.
It may be hard to get the tire to sit fully on the hub due to it wanting to spring back off.
Once the tire is on the hub as far as possible, get all six #8-32 bolts started. Work around the cover plate and tighten each bolt a little at a time until all bolts are tight.
Be careful not to have the tire pinched between the cover plate and the edge of the hub.
Pneumatic Wheel Tire (6" OD, Centipede)
Pneumatic Wheel Tire (8" OD, Diamond)
Pneumatic Wheel Tire (8" OD, SmoothGrip)
Pneumatic Wheel Hub (Aluminum, 1/2" Hex Bore)
Pneumatic Wheel Hub Adapter (6" OD to 8" OD)
1.0
6/28/2023
Document created.
1.0
6/28/2023
Document created.
Below is a table with pressure values and the associated diameter and width measurements for each type of pneumatic wheel. These values need to be taken into consideration when a drive train is being designed to ensure that no rubbing will occur and various pressures.
| PSI | Width | Diameter |
|---|---|---|
| PSI | Width | Diameter |
|---|---|---|
| PSI | Width | Diameter |
|---|---|---|
5
1.77”
7.53”
10
1.89”
7.54”
15
1.94”
7.54”
20
1.98”
7.54”
25
2.03”
7.55”
30
2.07”
7.56”
35
2.11”
7.58”
5
1.70”
7.58”
10
1.77”
7.58”
15
1.82”
7.58”
20
1.88”
7.59”
25
1.92”
7.60”
30
1.93”
7.61”
35
1.95”
7.62”
5
1.65”
5.86”
10
1.65”
5.93”
15
1.65”
5.97”
20
1.65”
5.97”
25
1.65”
6.06”
30
1.66”
6.08”
35
1.66”
6.09”
40
1.68”
6.17”
45
1.70”
6.19”
50
1.71”
6.23”
