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by admintrev
Tue Jan 02, 2018 10:00 pm
Forum: Wheelchair/Scooter chat
Topic: Dismantling Mirage Wheelchair Motor Gearbox
Replies: 1
Views: 487

Re: Dismantling Mirage Wheelchair Motor Gearbox

Regarding the bearing part numbers, I've had a look online and found the following: Part Number, Bore Dia, Outer Dia, Width 6904 = 20 mm, 37 mm, 9 mm 6001 = 12 mm, 28 mm, 8 mm 6003 = 17 mm, 35 mm, 10 mm 6200 = 10 mm, 30 mm, 9 mm The letters and numbers after the part numbers describe the seals. RS m...
by admintrev
Tue Jan 02, 2018 5:33 pm
Forum: Wheelchair/Scooter chat
Topic: Dismantling Mirage Wheelchair Motor Gearbox
Replies: 1
Views: 487

Dismantling Mirage Wheelchair Motor Gearbox

I replaced the motor/gearbox units when they started making horrible noises. I decided to dismantle the gearbox units and replace the bearings to see if that fixed the issue. gearbox_housing_small.jpg input_shaft_bits_small.jpg main_shaft_bits_small.jpg main_shaft_bits2_small.jpg misc_bits_small.jpg...
by admintrev
Mon Jul 13, 2015 8:45 pm
Forum: Wheelchair/Scooter chat
Topic: Electric Wheelchair Design "hyperchair"
Replies: 16
Views: 11011

Re: Electric Wheelchair Design "hyperchair"

As the weight of all of the parts of my new design of chair (apart from the motor/wheel assemblies) is well under 10kg it wouldn't be too hard to have that as a maximum weight. This could be achieved by using a spanner to remove the single centre nut from each axle to separate the wheels from the mo...
by admintrev
Mon Jul 13, 2015 4:30 pm
Forum: Wheelchair/Scooter chat
Topic: Electric Wheelchair Design "hyperchair"
Replies: 16
Views: 11011

Re: Electric Wheelchair Design "hyperchair"

Lessons learned etc: Some parts on the chair didn't work out as well as hoped: 1) The motors had more movement than I liked because of the quick release blocks and as I wasn't using them to dismantle the chair I have removed them and attached the motors directly to the frame. I'm not sure if it was ...
by admintrev
Mon Mar 31, 2014 4:02 pm
Forum: Wheelchair/Scooter chat
Topic: Electric Wheelchair Design "hyperchair"
Replies: 16
Views: 11011

Re: Electric Wheelchair Design "hyperchair"

Mass of individual parts (kg): Part Mass (kg) lower frame 11.5 upper frame 3.26 Seat 2.66 Joystick 0.64 Arm rest(No 1) 1.01 Arm rest(No 2) 0.97 Wheel Assy (No 1) 9.86 Wheel Assy (No 2) 9.81 Battery (No 1) 15 Battery & Controller & cables 16 Back rest 2.56 Total Mass 73.27 If light weight bat...
by admintrev
Mon Mar 31, 2014 1:57 pm
Forum: Wheelchair/Scooter chat
Topic: Electric Wheelchair Design "hyperchair"
Replies: 16
Views: 11011

Re: Electric Wheelchair Design "hyperchair"

A trial assembly was carried out to ensure that the batteries would not rub on the tyres when the chair is in use. an additional cross-member has been added behind the batteries as they were rubbing on the rear tyres. After the trial assembly it was decided to tack on the footrest as a temporary mea...
by admintrev
Mon Mar 24, 2014 12:45 pm
Forum: Wheelchair/Scooter chat
Topic: Electric Wheelchair Design "hyperchair"
Replies: 16
Views: 11011

Re: Electric Wheelchair Design "hyperchair"

Parts LIst (Not including tools used)t: Rear Tyres 2 x 15x6.00-6 4 Ply Kenda K500 Super Turf with K-SHIELD supplier=allterraintyres.co.uk cost=79.9 delivery=6 total cost=85.9 Rear Rims Hegar 2 x 6” Spun Aluminium half 2.5” Hegar 2 x 6” Spun Aluminium half 2” + £24.04 duty supplier=Hegar (USA) cost=$...
by admintrev
Sat Mar 08, 2014 6:17 pm
Forum: Wheelchair/Scooter chat
Topic: Electric Wheelchair Design "hyperchair"
Replies: 16
Views: 11011

Re: Electric Wheelchair Design "hyperchair"

After cutting X, X', Y and Y' down to 17cm, they were welded into place along with S and S'. After welding S and S' into place it appears that although strong enough in the assembled configuration they will need reinforcing with corner bracing. The photo below shows the top section in place: chair_t...
by admintrev
Fri Mar 07, 2014 6:26 pm
Forum: Wheelchair/Scooter chat
Topic: Electric Wheelchair Design "hyperchair"
Replies: 16
Views: 11011

Re: Electric Wheelchair Design "hyperchair"

Below is the drawing for the two bearing housings: bearing_housing.jpg The bearing clearance is to allow for distortion whan the housings are welded into the frame. After welding the bearing housings into the frame it was found that a small amount of filing was required at the top where the metal ha...
by admintrev
Thu Mar 06, 2014 6:53 pm
Forum: Wheelchair/Scooter chat
Topic: Electric Wheelchair Design "hyperchair"
Replies: 16
Views: 11011

Re: Electric Wheelchair Design "hyperchair"

The aluminium hubs are still a work in progress (the keyways need cutting and then then they need reducing in size [to save weight]). The photos below show the aluminium hubs in use (non-functional as the keyways still need cutting) along with the rest of the frame assembled to verify the cutting le...

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