Originally Posted by Greyswann
1) I was amazed when i pulled the tubes upper mount to find there was no attempt to set the tubes in some sort of bearing design..not even an open U-mount. Only blocks of stacked plywood lathered in axle grease. I understand the tubes only rotate a few degrees (15?) but it seemed that during the jerky operation of the top the chattering sound came from that area.
2)somewhere in a similar topic someone sais they were told by the Midwest SMB that the jerky top movement was from the motors not being synced and it would correct itself with a certain number of complete raises and drops. Do you understand how this might work?
Plywood lathered in axle grease????? That's a new one..haven't seen that on any tops.....
Remember that the front tube rotates and the rear tube slides and rotates. I've been contemplating using a sheet of ULMW PE (ultra low molecular weight Polyethylene.....the white slippery plastic cutting boards are made from) on the sliding tube to reduce friction on top of
or in place of
the plywood. At this point my manual top raises and lowers quite easily so I'm working on higher priority projects like moving my front axle forward.
If you have a power SMB top, they use Linak actuators. When using a pair of Linak actuators they can be used with or without an optional electronic control box (I think this is the case..it's been awhile). The control box is required for higher loads and/or dynamic loading (again don't remember details) but with lighter loads it's not required, and SMB just uses the actuators. I assume the control box gets position feedback from the actuator to keep them synched. I called Linak and talked to one of the engineers there a few years ago when I determining the scope of converting a top to power.