Derek The Daleks Wheels
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This got a bit complicated so here is some of the work trying to figure out the best way to do this.
First I had to model the Dalek Skirt from measurements taken from the physical skirt.
Next I had to measure up the wheel chair base we have and model that.
Then integrate the two models and see whether or not they would fit together.
Integration Version 1
This is the mating of the Skirt model with the current state of the Wheel Chair base.
|Wheelchair Integration Take 1|
As you can see things dont look great for fitting together and it looks like the front castors will clash with the body of the skirt. To confirm I modified the castor position so that the wheels were in a nominal "worst case" for clashing with the body for Integration version 2.....
Integration Version 2
|Wheelchair Integration Take 2|
With one castor rotated to 90 degrees to the side and one to 180 degrees, forward . It becomes clear that the existing chair configuration isn't going to work.
Integration Version 3
This version has a space model of the volume swept by the front castors so you should be able to see where a castor might clash with the skirt in any orientation. I also had to try and squeeze things together a bit somehow.
Space recovering steps:
- Move the castor pivot brackets in-board od the wheelchair frame. (essentially just swap the left and right wheels over and bolt them inside, rather than outside, the frame.
- Shorten the wheelbase. Move the rear wheels forward on the frame. This effectively pulls the castors backwards away from the skirt.
|Wheelchair Integration Take 3|
This looks like it will work. However the shorter wheelbase may be an issue:
- Making the steering response too lively.
- May affect stability by moving the weight too close to the rear axles.
- The inboard castors may make it difficult for the driver to fit their feet in to the Dalek.
- Switch to a 3 wheel design with only one castor as far forward as possible.
- Locate smaller diameter / narrower castor wheels.