The frame.

I wanted to give a good idea as to where we actually are at, and what the first steps will be.

The frame is well prepped, and brackets have been added (temp) to hold the two 12v batteries.

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We have brackets to mount the motors to the frame (one on each side).  The motors are 24v DC Bosche 750w motors, and should provide adequate torque.

A question has come up, though.  Would it be most efficient to mount the motors in the middle of the frame, or further towards the front?  Would one method be more precise for small movement than the other?

After mounting the motors, a track must be constructed.  Any track vehicle hobbyists out there?  Currently, designs are being reviewed for constructions of tracks based on bicycle chains and used tires.  4 or 5 chains could be joined to create each track.  Rubber pads could be constructed from old tires, and given appropriate grip for traction.

Once the drive system has been added to the frame, we can start to work on the various components (electronics, robotic arm, etc) in the appropriate order.  First thing’s first, and if the bot can’t move efficiently, then we have a problem.

We will need to purchase some materials soon, also.  This includes: square bar, steel rods, gears, chains, and other metal stuff; and also servos and components for the brains.

If you have experience with:  servos, RC, or anything robotic or electronic, we want to hear from you!

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2 responses to “The frame.

  1. From my experience with SpEd Kids in electric wheelchairs the positioning of the battery depends a lot on where the most weight is and what the terrain will be. In other words- balance point…

    • I am also interested in over performance stability wise. In the electric chair we used, the batteries were placed near the front. This would support general leaning by the patient, but not a good platform for varying terrain. Nor to support a heavy arm off of. With batteries near the back, around ~40-50 pounds is placed near the rear “wheels”. This will provide a good rear-based “center point” and a rear- center of gravity. The front side could then be more freely able to adjust to changes in terrain?

      How is the overall stability of these chairs (in practice)?

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