- Joined
- Sep 26, 2009
- Messages
- 2,210
Regarding the old cheshnut. fork sticking.
This is the problem; STICKY SLIDERS.After a few simple tests , your concerns about fork sticshion,could be the nature of spring compression :!:
I placed a standard commando spring down the stanchion and applied a known weight; ie 21.5 kg the spring reacted by compressing 28mm, But i could compress it another 10mm ,total 38mm..by pushing onto the 21.5 kg , and it stayed there :shock: Pulling back the said weight and allowing it to settle again , well it was back to the 28mm. The answer is simple...as the spring deforms it twists to impart a force to the tube wall. this action is a frictional force at right angles to the centre line, Appling more weight increased the outward force's . having seen many springs with there sides worn.conferms this. AND WEAR AND FRICTION GO TOGETHER This is the effects by static loading and not under road usage...but the effect is there! Interesting ?
This is the problem; STICKY SLIDERS.After a few simple tests , your concerns about fork sticshion,could be the nature of spring compression :!:
I placed a standard commando spring down the stanchion and applied a known weight; ie 21.5 kg the spring reacted by compressing 28mm, But i could compress it another 10mm ,total 38mm..by pushing onto the 21.5 kg , and it stayed there :shock: Pulling back the said weight and allowing it to settle again , well it was back to the 28mm. The answer is simple...as the spring deforms it twists to impart a force to the tube wall. this action is a frictional force at right angles to the centre line, Appling more weight increased the outward force's . having seen many springs with there sides worn.conferms this. AND WEAR AND FRICTION GO TOGETHER This is the effects by static loading and not under road usage...but the effect is there! Interesting ?