Mar 21, 2005, 01:48 PM Registered User California Joined Dec 2004 162 Posts Actuator Help can someone help me with this problem? I have 36 awg wire and i need to make a 30 ohm actuator, how many feet of wire should i use and how do i solve this problem?
 Mar 21, 2005, 02:36 PM Registered User Coventry Joined May 2004 268 Posts Just done a quick search for you. look at the stuff I posted here. http://www.rcgroups.com/forums/showthread.php?t=324779 None of it is mine, I'm not that good yet
 Mar 21, 2005, 03:05 PM Registered User California Joined Dec 2004 162 Posts cant really find anything that will help.
 Mar 21, 2005, 03:21 PM Registered User USA, FL, Fort Lauderdale Joined Feb 2002 1,902 Posts 36 awg is a bit large, but measure out 30 feet or so and check the ohm reading. You should be able to do some math and figure it out from there. When I first started winding coils I just made one until it looked right and checked the resistance, keeping track of the number of turns, wire guage etc. It's good practice and shouldn't take you too many practice coils to zero in on your 30 ohms. Dave
 Mar 21, 2005, 03:35 PM Registered User California Joined Dec 2004 162 Posts do i measure the ohms by simply putting a voltmeter between the circuit with power going to the coil?
Mar 21, 2005, 03:48 PM
Inventor
Sweden, Gothenburg
Joined Mar 2005
179 Posts
Quote:
 Originally Posted by anyoneelse do i measure the ohms by simply putting a voltmeter between the circuit with power going to the coil?
Hay Im no king at this ither.. but I tried my way.. my first atemt was 0.25mm coil-wire.. and that meassured about 3.3ohms.. big setback, but then I tried 0.12 and got 57ohms - try wind and siply meassure ohm between the two ends of your actuator

'peace.
 Mar 21, 2005, 04:07 PM Registered User California Joined Dec 2004 162 Posts you got 57 ohms from 30 ft of .12mm wire, correct?
 Mar 21, 2005, 04:23 PM Registered User Sydney Joined May 2004 326 Posts From the referred spreadsheet you need 22.65m of 36swg wire to make 30 ohms. It is way too big, 12mm OD for 4.5mm ID and 2.5g. Thats about 880 turns. You need finer wire.Try old coils from fish tank bubbler, cheap clocks or wall timers.
 Mar 21, 2005, 04:31 PM Registered User California Joined Dec 2004 162 Posts ok, thats what i thought. ill get some thinner wire. where did you find the information on turns and resistance of coils? and what are some good ways of getting the enamel off?
Mar 21, 2005, 04:42 PM
Registered User
Sydney
Joined May 2004
326 Posts
I've attached the spreadsheet again I think the link is in here somewhere but not sure where. You will need to unzip it. Credit to the author who I do not remember, he posted it here before.

I can get the enamel off with soldering flux and heat.

When using fine wire braid the tails so you have 5 or 6 strands twisted together. keep a couple of turns of each braid on the coil so you are much less likely to break the tails off.