today's work

[He Who Shall Not Be Named]

LOL

Touché, sir!

[redboat219]

Stupendous... Marvelous... Incredible... defies all laws of Newtonian physics! I'm a frig'n God!!!!

Rube Goldberg is my *****!

David
just say'n

[He Who Shall Not Be Named]

Stupendous... Marvelous... Incredible... defies all laws of Newtonian physics! I'm a frig'n God!!!!

Rube Goldberg is my *****!

David
just say'n

[redboat219]

[He Who Shall Not Be Named]

David,

Is there positive connection between the servo push rods and the "pedals" on the dive planes and rudder control arms, or do they just abut against each other?

If its the latter, is there a spring that maintains tension on the pedal arms to move them back when the push rods retract back?

The SD's pushrod pushes against the top end of its bell-crank. The two bell-cranks share a common spring that pushes them at the bottom.

[redboat219]

David,

Is there positive connection between the servo push rods and the "pedals" on the dive planes and rudder control arms, or do they just abut against each other?

If its the latter, is there a spring that maintains tension on the pedal arms to move them back when the push rods retract back?

[He Who Shall Not Be Named]

So those 2 small joysticks control the diveplanes and rudder, one for each. In theory, a pair of 1/16 Navy SEAL action figures can drive this thing. One to handle the dive planes, the other to steer. OR one 1/12 or 1/6 action figure operating a one man SDV.

Would be nice to have a scale cockpit with SEAL figures one can drop in in lieu of the WTC when displaying the sub.

Anyway, What's the reason for forward location of the servos?

First I get this thing to work, later I finesse things to permit an open cockpit.

The tight confines between stern and after end of the SD precludes the traditional linkages and running gear coupling.

David

[redboat219]

So those 2 small joysticks control the diveplanes and rudder, one for each. In theory, a pair of 1/16 Navy SEAL action figures can drive this thing. One to handle the dive planes, the other to steer. OR one 1/12 or 1/6 action figure operating a one man SDV.

Would be nice to have a scale cockpit with SEAL figures one can drop in in lieu of the WTC when displaying the sub.

Anyway, What's the reason for forward location of the servos?

[biggsgolf]

Awesome, amazing detail

[biggsgolf]

Very cool David

[He Who Shall Not Be Named]

Hi David,
Are you planning to put o-rings on the drive post to cushion the contact?

The two sets of magnets don't make contact, there's about a 1/16" space between them. Torque is strictly magnetic, no mechanical contact at all. The inverse square law is our friend in this application -- shimming the distance between the two sets of magnets varies the strength of the bond.

[bwi 971]

Hey Bart,

I don't thread those size shafts, I use set screws to make up items to them. I'll grind a flat at an end of the shaft that will receive a set-screw that secures the item (wheel-collar, propeller hub, or universal coupler) against axial and rotation with a tight fitting set-screw.

If I were to thread these I would go with a 4-40 for the .025" shaft, and a 6-32 for the .137" shaft.


David

Ok thks David, your way will result in better centering.....not everybody is able to cut a thread with a die.....most of them will end with a wobbling propeller.

Grtz Bart

[Scott T]

Hi David,
Are you planning to put o-rings on the drive post to cushion the contact?

[He Who Shall Not Be Named]

Completely off topic but need your assistance David.

I am struggling to comprehend you guys thread system.

For shafts 1/8 and 3/16 what threads go on those?

I need to order threaded bushings.

#6-32 and #10-24?

Thks & grtz,
Bart

Hey Bart,

I don't thread those size shafts, I use set screws to make up items to them. I'll grind a flat at an end of the shaft that will receive a set-screw that secures the item (wheel-collar, propeller hub, or universal coupler) against axial and rotation with a tight fitting set-screw.

If I were to thread these I would go with a 4-40 for the .025" shaft, and a 6-32 for the .137" shaft.



David

[bwi 971]

You're one of the few who make good use of the information I and other terribly talented people present to the great-unwashed.

David

Completely off topic but need your assistance David.

I am struggling to comprehend you guys thread system.

For shafts 1/8 and 3/16 what threads go on those?

I need to order threaded bushings.

#6-32 and #10-24?

Thks & grtz,
Bart