Re: [PSUBS-MAILIST] Fixed motors versus rotating

That's not a bad idea Jim,

Looking at the size of the motors in my linear actuators, I would only

need something that size to get the same speed of rotation.

I'm controlling everything off a Play station 2 controller, & the input output converter board has

pulse width modulation for the x & y axis on both joysticks. This means I already have speed

control for your option.

.... I just ran a car window motor off my system & works brilliantly & already has the reduction gearing.

Might be on to a winner thanks.

Regards Alan

----- Original Message -----

From: JimToddPsub@aol.com

To: personal_submersibles@psubs.org

Sent: Saturday, March 26, 2011 3:19 PM

Subject: Re: [PSUBS-MAILIST] Fixed motors versus rotating

Alan,

If you're trying to avoid having a rotating shaft penetrate the hull, one solution you might consider is using a small motor sealed with a worm gear to rotate the thruster motor. That can give you as many degrees of rotation as you want. It's very compact, has plenty of torque, and operates smoothly.

Jim

In a message dated 3/25/2011 7:54:37 P.M. Central Daylight Time, alanjames@xtra.co.nz writes:

Sorry mistake, should have said

"intended to have them rotating through 180 degrees to give me both forward & vertical movement."

----- Original Message -----

From: Alan James

To: personal_submersibles@psubs.org

Sent: Saturday, March 26, 2011 1:32 PM

Subject: [PSUBS-MAILIST] Fixed motors versus rotating

Hi all,

I have 2 motors that are going to be mounted port & starboard, & had intended to

have them rotating through 180 degrees to give me both forward & lateral movement.

I have two linear actuators (electric rams) that I was going to use to achieve this; however a direct linkage from the actuator

piston to a disk or lever on the motor rotating shaft won't give me 180 degrees. I would have to use some sort of gearing,

maybe a rack & pinion.

This all is seeming a bit hard & I'm tempted to buy 2 more motors & dedicate them to the lateral movement.

So I would have 4 fixed motors.

I don't want to rotate them using "through hulls"

Any words of wisdom on either how to set the motors up to rotate 180 degrees or on the pros & cons of fixed or rotating

motors thanks.

Regards Alan