Monday, December 28, 2009
"W"-slingshot: Ball Bearings added
the "W" slingshot, my best concept so far, has taken the next step.
I noticed that the rotating grip did not self center when a very strong band set was fully drawn out.
The rotating mechanism was just a steel tube that rotated around a thinner steel tube, the thinner tube beeing welded to the frame. It obviously had too much friction to rotate when the system was set under full pressure.
So I ordered some parts and enhanced the setup.
I added two ball bearings, originally from a motorcycle engine. I pressed them on the 12 mm steel rod that was welded to the frame, then pressed everything into a fitting aluminium tube (the grip). I cooled and heated the parts for the pressing. They are totally firm and there is NO play.
It works very well Now the grip rotates smoothly, even when I draw out my toughest bands.
Posted by The Slingshot Channel at 9:43 PM