I have done just this with my electric speeder that is for sale. The rear axle is rigid to the frame, the front wheels have their own pivoting frame.duckman903 wrote:We went to Washakum today and some one had brought there hand cranked speeder for there (guessing) 3 YOGS to use and the owner told my GD she could ride it , well it was made for a 3 YO so my 5' 11 YOGD had trouble riding it we found that the rigid chassis had no flex and kept derailing, now I realized that I'll have to incorporate 1 axle flexing , my first idea is similar to a bolster with the pillow blocks mounted on a plate that can rock side to side, I'm planning to make the drive axle rigid so any misalignment in the track will be taken care of by the sloppy axle. Does it sound like a good idea I'm open to suggestions.
It works like a charm but I had to add in springs to the front pivoting frame. Since adding springs the speeder does not derail. Without springs, the uneven track will throw you around to the point that the rear wheels will run off the track. With the stiff springs in the front, it keeps the speeder from swaying too much yet keeps all four wheels firmly planted to the rails.
The springs on the front are mounted such as to limit the pivoting action.
Here is a cad drawing of my speeder with emphasis on the pivoting action.
