(Dumb?) Linear servo question

[crazygary]

Thanks, once again, Subculture!!

I believe the larger plastic syringe, with a machined piston arrangement, will be a most acceptable way to go!

As this type of ballast tank will be incorporated into my Kilo, the build of which is "down-the-road-apiece", I'll file all of this great information for future reference!!

Your assistance is most appreciated!

[HardRock]

Wondering if this went any further?
Here's a relatively simple (and working) design idea using off the shelf bits.

The cylinder is a 20mm syringe. The plunger is the original rubber plunger that came with the syringe (a little tight, but absolutely waterproof). The motor is available from these guys…http://www.precisionmicrodrives.com/...lanetary-range ...and comes compete with a 700:1 planetary reduction gearbox for about 12 quid. Its mated to a Lego Techniks lead screw which came from here… www.ebay.com "Lego Power Functions 4638508 LINEAR ACTUATOR New/Sealed" which has a mechanical clutch at each end. The motor is controlled by an old servo control board and trim pot. In essence, it went together in a few hours and it works.

Now, better get back to the turbo encabulator!

[HardRock]

Simple ballast cylinder

Wondering if this went any further?
Here's a relatively simple (and working) design idea using off the shelf bits.

The cylinder is a 20mm syringe. The plunger is the original rubber plunger that came with the syringe (a little tight, but absolutely waterproof). The motor is available from these guys…http://www.precisionmicrodrives.com/...lanetary-range ...and comes compete with a 700:1 planetary reduction gearbox for about 12 quid. Its mated to a Lego Techniks lead screw which came from here… www.ebay.com "Lego Power Functions 4638508 LINEAR ACTUATOR New/Sealed" which has a mechanical clutch at each end. The motor is controlled by an old servo control board and trim pot. In essence, it went together in a few hours and it works.

Now, better get back to the turbo encabulator!

[He Who Shall Not Be Named]

Neat! Where are the mechanics that engage the feed-back pot?

M

[HardRock]

I didn't connect them in the end because the lead screw has a clutch at each end. The motor drives the plunger to the end of its travel and the clutch slips once it gets there. The same thing happens on the filling cycle. The pot is only used to adjust the neutral position.

[trout]

"Ahhh, I see" says the blind man, that is VERY cool.

[crazygary]

OOOrah!! Very cool indeed, Mate!!

Excellent find and the linear drive is quite nicely priced, as well!

This looks to be the goods for my Kilo build, once I manage to
break out of "target building mode"!! Hah!

Thanks much for yah post, and the links!

crazygary

[HardRock]

"Ahhh, I see" says the blind man, that is VERY cool.

You know. I blame you for getting me started with this tiny Type A thingy. There I was; fat, dumb and happy and then I read your post on the Aluminaut and it all seemed possible. Now that I'm up to my armpits in crocodiles, its becoming difficult to recall that my aim was to drain the swamp! I'm thinking of placing an anonymous ad in the trade press along the lines of, "desperate old fart seeks miniature ESC, 40 Mhz micro receiver and woman with VERY small hands". Its down to you pal! There may be consequences.

[trout]

I'm innocent, I tell ya, innocent.
it is appropriate that you bring up the Aluminaut, I recently received the remaining two ESCs to complete that sub! Will post as it happens or somewhere in a reasonable time frame!

[crazygary]

Good to hear that you're heading back to the aluminaut, Tom!!
Got my fingers crossed that this "bout" goes a lot better for ya than
the last one did. I recall those tiny ESC's were giving ya the fits!!!
Give 'er hell, buddy!

Also, thanks again for posting your great piston tank information,
Hardrock!! Sweet unit!!

crazygary