Shop our Airplanes Products Drone Products Sales
Thread Tools
Old Nov 04, 2003, 11:57 PM
Bob Bailey is offline
Find More Posts by Bob Bailey
SpinsMakeTheWorldGoRound

.1g muscle wire actuator


Pictured below is a .1g muscle wire dual actuator, which 30 degrees of throw each side of center. It is self-centering, with good centering accuracy and force. The reaction/return speed is good. Center/full throw/center less than .5 seconds. Current draw is approx. 50 ma necessitating an amplifier to drive it. Materials used in its construction include a .4 mm double-sided, copper-clad board, a .25 mm brass spring rod, .1 mm brass sheet and .001 muscle wire. The difficulty factor in building the first one is definitely a 10, but after you learn the tricks it is on par with building a .25 g magnetic actuator . I intend to post a step-by-step here for those interested.
Last edited by Bob Bailey; Nov 05, 2003 at 12:12 AM.
Sign up now
to remove ads between posts
Old Nov 05, 2003, 12:02 AM
Bob Bailey is offline
Find More Posts by Bob Bailey
SpinsMakeTheWorldGoRound
Pictured below is a simplified drawing of the actuator function. The spring provides a force for centering and return. The off-center pivot, in relation to the muscle wire attachment points, provides a center equilibrium. When power is supplied to one side of the actuator, the muscle wire contracts, the control horn rotates, and the spring stretches. When power is removed, the muscle wire relaxes, the springs contracts, and the control horn returns to neutral.
Old Nov 05, 2003, 12:14 AM
Trizza is offline
Find More Posts by Trizza
Grand Poobah of Nothing
Trizza's Avatar
Very cool! After making a few 200 ohm coils using .05mm dia wire I swore I'd never make them again, and its what has been stopping me from trying micro stuff again. I'd be very interested in seeing some instructions on how to make these things - I'd probably build them larger though.
Old Nov 05, 2003, 12:22 AM
billystiltner is offline
Find More Posts by billystiltner
Registered User
billystiltner's Avatar
That is amazingly small.
I'm interested in the step by step process.

Billy
Old Nov 05, 2003, 01:05 AM
AIR MOVER is offline
Find More Posts by AIR MOVER
Master of the Wind
AIR MOVER's Avatar
How about step by step selling of them to us not so good at this new form of stepping.. =)~~~~~~~~~
Old Nov 05, 2003, 01:19 AM
clipclop is offline
Find More Posts by clipclop
Registered User
Bob,
Thats the neatest, best designed muscle wire setup i have seen .
Great work , cant wait for more details .
Stewart
Old Nov 05, 2003, 02:48 AM
Koichi Tanaka is offline
Find More Posts by Koichi Tanaka
Registered User
Koichi Tanaka's Avatar
Bob,

Where can he buy a 10-micron muscle wire?
Old Nov 05, 2003, 07:49 AM
epilot is offline
Find More Posts by epilot
Only nerd in the village
Bob, thanks for sharing. By all means go ahead an post a build description. Did you program a PIC yourself for driving the actuators?

Koichi-san, I think Bob must be talking about 1/1000 of an inch which is 25 micron. This wire is available from Bob Selman and Graham Stabler.

Michael
Old Nov 05, 2003, 09:19 AM
bselman is offline
Find More Posts by bselman
Registered User
bselman's Avatar

Muscle Wire


I no longer carry the muscle wire.

Bob Selman Designs
Old Nov 05, 2003, 09:34 AM
epilot is offline
Find More Posts by epilot
Only nerd in the village
Sorry Bob, I had not noticed that. Is the batch that was custom made sold out?

Michael
Old Nov 05, 2003, 11:13 AM
bselman is offline
Find More Posts by bselman
Registered User
bselman's Avatar

Muscle wire


I have sold out of that batch I had, but I understand that the LT025 is going to be produced again so there is not a problem with availability.

Bob
Old Nov 05, 2003, 11:39 AM
Gordon Johnson is offline
Find More Posts by Gordon Johnson
in persuit of low wing loading
Gordon Johnson's Avatar
For those wanting to buy a ready made musle wire actuator, but a different type of design, you can buy them from uIR in Finland

Gordon
Old Nov 05, 2003, 03:03 PM
aeronutz is offline
Find More Posts by aeronutz
Registered User

Progress!


Well done Bob
Its good to see folks trying to make actuators with Flexinol - it has to be the way for micro planes. We just need to figure out the best way to use the material.

I have sent my aritcle on our APPA actuator to the publishers so hopefully it will be in the shops before Christmas

The article describes our actuator but then goes on to say how to install it into a suitable plane, in this case a 10" span Jigglet weighing about 7.5g. My point is if you have a super light actuator you shoudl put it in a super light plane to get the advantage from it.

Micro ducted fan jets woudl benefit from Flexinol actuators as jets are still a little underpowered at the moment, but hopefully that will be better now we can use two 90mA cells.

I think it woudl be better to use coil actuators for planes weighing more than 10 grams

Well done Bob ......... more! more!

Youruncle Mark

Maybe put the actuator in a micro Corsair like Joe's see our news letter

http://www.aeronutz.flyer.co.uk/Oct03a.htm
Old Nov 05, 2003, 03:11 PM
Dave Wulff is offline
Find More Posts by Dave Wulff
Registered User
Dave Wulff's Avatar
Uncle Mark,

What publication is the article going to be in?

Dave
Old Nov 05, 2003, 04:12 PM
indoor flyer is offline
Find More Posts by indoor flyer
Registered User
I checked the flexinol website and it appears they are selling the 25 micron flexinol again (still pretty expensive but it beats custom ordering it)

I too believe that flexinol is the future of micro RC. right now I plan on using flexinol to power a dragon-like ornithopter.


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion BBA / Muscle Wire Actuator - State of the art mtabumerang Scratchbuilt Indoor and Micro Models 9 Jan 27, 2007 06:16 PM
Coil actuator to muscle wire conversion dayhead Scratchbuilt Indoor and Micro Models 1 Oct 11, 2004 06:10 PM
Muscle Wire Actuator Driver billystiltner Scratchbuilt Indoor and Micro Models 15 Dec 04, 2003 08:07 PM
muscle wire "servos"? Comatose Scratchbuilt Indoor and Micro Models 1 Feb 07, 2002 05:23 PM
Muscle Wire MicroRotors Parkflyers 11 Jun 04, 2001 01:56 AM