[PSUBS-MAILIST] actuators

[Alan via Personal_Submersibles]

Hank,
can the acetylene regulator relieve pressure? Also don't you want a
regulator that can be used external to the hull so you eliminate the requirement
for any through hulls.
You need some way of relieving pressure. If you dive to 500ft there will
be 250psi of air in the actuator to make it ambient, but if it's not relieved it will blow
the actuator apart before you reach the surface!
Another thought was "are there any electronics with electrolytic capacitors in
the actuator"? If so they may be vulnerable to pressure.
Cheers Alan 

Sent from my iPad

> On 29/11/2017, at 10:27 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> The wires are very well sealed and may be good the way they are.  I will pressure the actuator up and look for leaks first, but I think it is fine as is.  I will use the same system Cliff has developed if need be.  Being the cheap ass that I am, I will first have to test a theory I have.  I think there is potential to use a O2 regulator from a oxy acetylene  set up.  This regulator can take full tank pressure and can be regulated to nothing.  Plus I have one to play with.  
> Hank
> 
> On Tuesday, November 28, 2017, 1:27:21 PM MST, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Hank,
> You jogged my memory about the actuator being in two separate halves.
> How are you going to seal the cable entry? Can you drill & tap for a hose
> fitting & send your air & wires in through that?
> How are you doing the air compensation; modified second stage regulators
> or are you adding over pressure as with Cliff / Hugh's relieving regulator?
> Cheers Alan
> 
> Sent from my iPad
> 
>> On 29/11/2017, at 8:52 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> Alan,
>> I have just  disassembled my new electric actuator and am extremely please with the way it is built.  It is very light and operates smoothly.  The speed is perfect and about the same as my hydraulic  functions on my current arm.  Air compensating will be a breeze by drilling into the end cap and threading in a fitting.  A second vent hole will have to be drilled in the casing to allow air to move freely between the two halves of the actuator body.  I spent about 250 Canadian for one actuator, so a four function arm would be 1,000 dollars.  I will put it all together and see how it works but I am confident it will be a big improvement on a hydraulic set up both in cost and weight, not to mention complexity.  By adding air compensation, it gives me an excuse to air compensate my vertical thrusters.  I will mount a dedicated air tank for this set up.
>> Hank
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