Steve, where I work there are lots of electric 'plinths' (treatment
couches) that have an electric ram to adjust its height. These can cope
with the weight of two people sitting on it and the lever arm is quite
short.
the ram extends only about 8" though and the motor inside was 24V DC on
the units we have. When I played with it it ran quite happily on 12V.
Its not a pivot pin and snap on mounting, it has forks on each end.
Maybe you could source a used one and see if it does the job, just
remove the transformer and control board in the housing.

Klaus

Steve wrote:

Cause I'm looking for a 12 volt electric linear drive.

I guess I should have avoided the use of the term "ram".

Sorry.

Steve
s/v Good Intentions

I have one that someone gave me; as below, 24VDC. I haven't tried it on 12,
but I expect it will work as long as the load isn't too high.
it's from a scrap airplane [should be reliable, then].
Regards, Mark Holden


"Klaus" wrote in message
...
Steve, where I work there are lots of electric 'plinths' (treatment
couches) that have an electric ram to adjust its height. These can cope
with the weight of two people sitting on it and the lever arm is quite
short.
the ram extends only about 8" though and the motor inside was 24V DC on
the units we have. When I played with it it ran quite happily on 12V.
Its not a pivot pin and snap on mounting, it has forks on each end.
Maybe you could source a used one and see if it does the job, just
remove the transformer and control board in the housing.

Klaus

Steve wrote:

Cause I'm looking for a 12 volt electric linear drive.

I guess I should have avoided the use of the term "ram".

Sorry.

Steve
s/v Good Intentions

Many of the older Autohelm Linear actuators for underdeck pilots should
be available now that Raymarine no longer supports AH5000, etc. You
might find an orphaned older type Linear type 1 drive laying around a
dealers shop that might be acquire for a 'song'. The older Linear type
1 drives do consume a lot of amps, but might be just what you are
looking for (if you have a means of controlling one). They are HUGE.
Such drives typically can handle boats up to 24000 lb.

Steve wrote:
I have a AH3000 tiller pilot that is in good working order but the linear
ram/drive is a bit light on power for my Ingrid 38 (13.5 ton). She has a
huge rudder and even if the tiller pilot can steer her, there are the
frequent occasions when the boat rolls and the tiller pushes the ram and I
can hear that little motor and gears scream as they are forced 'against
their will'. I imagine they will fail eventually.

These and other tiller pilot ratings fall far short of the need of a boat of
this displacement.

What I'm looking for is a 12 volt DC linear ram with about a 10-12 travel. I
don't care if it is marinize, I just want to experiment with some
adaptations.

I see a lot of iron gates with big cylinder but I think they are 110 AC and
too long a stroke for my needs.

I don't want to spend a fortune but perhaps a surplus one would work for
some experimentation.

I have checked a couple surplus catalogs but haven't found anything.

Anyone have any ideas on this??

Steve
s/v Good Intentions

What I'm looking for is a 12 volt DC linear ram with about a 10-12 travel.
I don't care if it is marinize, I just want to experiment with some
adaptations.

http://www.elero.biz/index.php3?Lang=en

- products
--- Linear actuators

There you can find some information about linear actuators.

Why don't you want to use a hydraulic ram?

Stephan


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Stephan Kachholz wrote:

What I'm looking for is a 12 volt DC linear ram with about a 10-12 travel.

I took my autotiller apart this weekend. It isn.t a true linear ram, but
rather a rotating motor turning a threaded shaft. No doubt much cheaper
and more "push".

Regards, Howard