Horstman Slip-A-Just clutch

[Bill Peck]

Guys,

You are correct that the arms should be in the trailing position but you are off on the effect of moving the shoe away/closer to the pivot along the arms. The engagement speed goes up or down in relation to the force of the shoe against the drum. With the shoe attached to the arm as far away from the pivot as possible the force of the shoe against the drum will be less than if the shoe is placed closer to the pivot for the simple reason that the arm hanging out past the shoe acts like a lever  to increase the force of the shoe against the drum.
The shoe itself will be traveling the same speed regardless of where along the arm it is mounted so the  centrifugal force generated by the shoe alone will be the same in any position. However, since the arms have a pivot they will act as a lever on the shoe anywhere the shoe is located other than at the far end.
Think of your good old nutcracker and why it is so easy to crush the nut if it is placed close to the pivot versus if you place the nut out at the end of the two handles LOL
Steve O'Hara

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Guys,

You are correct that the arms should be in the trailing position but you are off on the effect of moving the shoe away/closer to the pivot along the arms. The engagement speed goes up or down in relation to the force of the shoe against the drum. With the shoe attached to the arm as far away from the pivot as possible the force of the shoe against the drum will be less than if the shoe is placed closer to the pivot for the simple reason that the arm hanging out past the shoe acts like a lever  to increase the force of the shoe against the drum.
The shoe itself will be traveling the same speed regardless of where along the arm it is mounted so the  centrifugal force generated by the shoe alone will be the same in any position. However, since the arms have a pivot they will act as a lever on the shoe anywhere the shoe is located other than at the far end.
Think of your good old nutcracker and why it is so easy to crush the nut if it is placed close to the pivot versus if you place the nut out at the end of the two handles LOL
Steve O'Hara

Thanks Steve. Unfortunately I didn't see you post until Friday. That's after I spent all day Thursday trying to get it to slip more going the wrong way. Oh well, there's no fool like an old one!