Rotator types

[AHPP]

Rotators for rigid rotating grabs. As far as I can tell there are the barrel type (is there a more commonly used name for them?) and the worm drive type.


Barrel type

Worm drive type

Am I right in saying that the barrel type work on whatever hydraulic magic makes most hydraulic motors work, fluid friction, swash etc and are therefore not mechanically locked if a hose blows or whatever? It would follow that they resist rotation by the presence of still oil and whatever valves are in the machine system? Will they slip if loaded excessively or is that down to valves in the rest of the system again?

As far as I can tell, the worm drive type like on engcons won't slip until the teeth sheer off inside, which would surely need to be a monstrous load? How is infinite rotation achieved on grabs under these without twisting the hoses that operate the grab ram?


First post here btw. Pleased to make your virtual acquaintances. I recognise a few names from arbtalk.

 

[V8Druid]

therefore not mechanically locked if a hose blows or whatever? It would follow that they resist rotation by the presence of still oil and whatever valves are in the machine system? Will they slip if loaded excessively or is that down to valves in the rest of the system again?
As far as I can tell, the worm drive type like on engcons won't slip until the teeth sheer off inside, which would surely need to be a monstrous load? How is infinite rotation achieved on grabs under these without twisting the hoses that operate the grab ram?


First post here btw. Pleased to make your virtual acquaintances. I recognise a few names from arbtalk.

yes, yes and via a rotary coupling with two galleries ....

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welcome to the forum

 

[JD450A]

I'm here to wait for the inevitable C word.

 

[craig]

C

....E....

 

[Mogman]

C

....E....

....T....

 

[Mick-the-fitter]

Clever!!

 

[V8Druid]

....T....

don't you ****in' start ..... get enough crap from six toes and his piskie brethren

 

[doobin]

Get him out of here! Back to the tree place with you!

The barrel type as you put it will rotate fairly easily- you can usually pull em round by hand. Not a problem in the usual day to day work of chucking brash around, but obviously for cut and hold with a grapple saw up a tree you’d spec a worm drive.

 

[AHPP]

How very straightforward. Thanks.