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Frequently Asked
Questions

Open Wheelchair Part List

The parts list is broken into 3 parts:

  • PVC Frame,
  • Gear Train, and
  • Electronics.
The frame is adjustable to the size of the child and so you will need to make six measurents of your child with a rule or tape measure, and enter the results below to get the correct size of the PVC segments, so that your wheelchair can be perfectly tailored to the size of your child.

When you press the "Size Parts" button, below you will be give a total list of all the PCB segments that will need to be cut for the wheelchair. This will also calculate the total length of PCB that you will need to purchase. You should buy extra PVC, because there will be remnants from each stock piece that is cut.





Child's Measurements

M1 Seat Width. Measure distance between hips (inches)
M2 Seat Depth. Measure inside of knee to back of hips (inches)
M3 Foreleg Length.Measure from inside of knee to bottom of foot (inches)
M4 Back Length.Measure from bottom of seat to top of shoulders (inches)
M5 Arm rest height. Measure from bottom of seat to elbow (inches)
M6 Forearm length. Measure from elbo to tip of fingers. (inches)



If you pruchase your PVC piping and connectors from www.formufit.com, you can get get them in a variety of colors. When ordering use the color suffix.


PVC Parts List

1/2" PVC Pipe Segments (From www.formufit.com Part Number: P012FGP-COLOR-5)


Part Number Description Pipe Length (inches) Quantity
PVC-PIPE1 Based on seat depth. PIPE1= M2 2
PVC-PIPE2 Based on seat width. PIPE2= M1+1 10
PVC-PIPE3 Fixed at 3.5
4
PVC-PIPE4 Half of seat depth. PIPE4= (M2-1) / 2 10
PVC-PIPE5 PIPE5= M4 - 5.5
2
PVC-PIPE6 Based onseat width. PIPE6= M1-2 2
PVC-PIPE7 PIPE7= PIPE2+8 1
PVC-PIPE8 Half of arm height. Minimum is (1.5). PIPE5= M5/2 8
PVC-PIPE9 Fixed at (1.5). PIPE5=1.5 5
PVC-PIPE10 Based on forearm. PIPE5= M6 2
PVC-PIPE11 Based on footrest height. PIPE3= M3-3 2
PVC-PIPE12 Based on footrest height. PIPE3= PIPE11-2.5 4
TOTAL PVC
(inches) (feet) ($)


1/2" PVC Connectors
(From www.formufit.com)

Note that pricing is for plane white PVC. Colored PVC costs about 20% more.

Part Description Part Number Quantity Cost Total
PVC-CON-A 4-Way Tee Connect 1/2" F0124WT-COLOR 6 $1.20 $7.20
PVC-CON-B 5-Way Cross Connect 1/2" F0125WC-COLOR 4 $1.70 $6.80
PVC-CON-C 3-Way Elbo Connect1/2" F0123WE-COLOR 6 $1.10 $6.60
PVC-CON-D 90 Degree Connect 1/2" F01290E-COLOR 6 $0.90 $5.40
PVC-CON-E Tee Connect1/2" FO12TEE-COLOR 6 $1.10 $6.60
PVC-CON-F Slip Sling Tee Connect1/2" F012STE-COLOR 9 $1.60 $14.40
TOTAL $47



PVC-CON-A

PVC-CON-B

PVC-CON-C

PVC-CON-D

PVC-CON-E

PVC-CON-F






All prices are in $USD. Note that becuse the design is evloving part numbers, prices, or suppliers may change without notice.

Main Parts List

Part Description Part Number Supplier Cost QTY Freight Total

Frame

PVC pipe and fittings Furniture grade PVC See PVC Parts List www.formufit.com/ $75.5 1 $15 $90.50
Seatbelt Auto-Style Positioning Belt 45928 www.1800wheelchair.com $12.50 1 $4.00 $16.50
Casters 5" x 1-1/4" Swivel Caster with 7/16" diameter grip ring connector. PRES5024ZN-TPR
Hardware Store, or

A1-Casters
Phone or email Order to sales@a1casters.com
$7.50 2 $10 $25.00
Fastener Pack Pack of screws, and clamps. FASTENER-PACK www.openwheelchair.org $14.95 1 $0.00, if purchased with controller, below. $14.95

Cushion

Note that you can purchase a cushion or make one yourself.
Seat Cushion(1)

Note that if you use this option you will need to use these dimensions in the calculator above for the hip width M1, and the femur length M2.
Comfort Company Curve Pediatric Cushion

Multiple sizes are available. 10"x10", or 12"x12" is a good size if you are unsure.

http://www.medicaleshop.com/ $61.68 1 $18.28 $79.96

Drivetrain

Gearbox Takanawa 555 Gearbox, 2 pcs.

2015021601

These gear boxes come with integrated motors. They are not as powerful, as the motor listed below, but they can be used.
www.aliexpress.com

Please note: if this link is unavailable, search aliexpress.com using the following search words: "Takanawa 555", and you will find various vendors that have stock.
$30.00 1 $2.95 $32.95
Motor RS-540 Motor.
These optional motors are more powerful than the motors which come included with the gear box.
RB-Ban-68 www.robotshop.com $6.25 2 $0.00 $12.5
Set Screw Hub Actobotics 8mm Bore 0.77'' RB-Sct-628 www.robotshop.com
www.amazon.com
$4.99 2 $0.00 $9.98
Hub Adapter Actobotics 1.50" x 0.770" RB-Sct-376 www.robotshop.com
www.amazon.com
$3.99 2 $0.00 $7.98
Wheel Actobotics 6" Heavy Duty RB-Sct-437 www.robotshop.com
www.amazon.com
$9.99 2 $9.00 $28.98
Pinion Remover Turnigy Pinion Removal Tool.
This is used to remove the pionion from the motor which comes with the Tekanawa gear box. You remove the pinions, and press them onto the other motors which are more powerful. If you are just using the motorsthat comewith the gear box, you don't need this tool.
S630 www.hobbyking.com $5.06 1 $6.37 $11.43
Gear Box Plate Custom Milled Aluminum Plate GEARBOX-PLATE www.openwheelchair.org $14.95 2 $0.00, if purchased with controller, below.
$14.95

Electronics

Motor Controller Board and Joystick Joystick Motor Controller Board with Joystick JOY_MOTOR_CTRL www.openwheelchair.org
Note, we are currently beta testing this product. If you order it now,it has not been fully tested.
$139.95 1 $9.95 USA,

$47.00 International
$149.90 USA,

$186.95 International
Battery(2) 5 Ah SLA battery B000YA7SQU www.amazon.com $14.99 1 $0.00 $14.99
Battery Charger Battery Tender Junior 12V Battery Charger 210123 www.amazon.com $25.66 1 $0.00 $25.66

NOTES:
(1) The seat cushion can be sown and assembled from these parts, or optionally a more expensive off the shelf seat cushion can be purchased.
(2) Any size battery may be used between 5 - 12 Ah or that fits below the seat.





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© Copyright 2015 Open Wheelchair Foundation. All rights Reserved.

The Open Wheelchair hardware design is licensed under CERN Open Hardware Licence v1.2 and the Software is licensed under the GNU General Public License Version 3. By viewing or using the design posted on this website you are agreeing to these licenses. To view the license see our license page.