[PSUBS-MAILIST] Hank's Dive

Sun Apr 14 21:09:22 EDT 2019

 Alan,Yes they are Lenco, but I don't find them expensive for the quality.Hank
    On Sunday, April 14, 2019, 6:51:14 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Thanks Hank,I believe you are using the Lenco actuators that have the ball bearing systemat the end of the stroke. If anyone is going to emulate you, this is a good butexpensive option. A word of warning about using other linear actuators; some use micro switchesto control the stroke limit & there is the possibility that they could trigger underpressure if you are pressure compensating the inside of the actuator.I drilled a hole in to the limit switches in one of my actuators because of this concern.Would be a problem if you grabbed hold of a large object & couldn't let go.Also the small brushed motors in my actuators didn't work well in oil.Alan

On 15/04/2019, at 12:17 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Alan,Advantages are huge, there is no pump or valves and the speed control is just amazing.  The actuators have ss shafts.  It takes about 1\2 hr to modify an actuator to oil or air compensation.  You take it apart and drill a passage way in the body so air or oil can flow to the entire cavity.  Then you make up a bunch of penetrators with a 1/4 in pipe fitting with two wires each.  You also have to drill a port in the housing for the air or oil line, and you do that while it apart.  If your sub has external scuba tanks with a first stage regulator, then air compensation is the way to go.  If you don't have that set up go with oil.  Just depends how your sub is set up.Hank
    On Sunday, April 14, 2019, 5:21:37 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Hank,what are the advantages of the linear actuators over a hydraulic manipulator.Is it just smoothness of control? No large valves?  If you have to have hoses to the actuator for compensation, which you would have for hydraulics anyway, thenis there much more of an advantage. You would need to find a linear actuator witha stainless piston rod.I am wanting to build a manipulator but still vacillating over the various options!Cheers Alan 
On 15/04/2019, at 10:31 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Alan,It was a shallow dive to get the sub balanced and ready for a job I have coming up.  I had to make proper electric penetrators to keep the oil in.  I also had to add an expansion bladder.Hank
    On Sunday, April 14, 2019, 1:49:38 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Hi Hank,
See on Facebook you have been diving!
Wondering what modifications you had to do on your electric arm.
How deep did you go etc.
Alan

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