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Old Sep 15, 2014, 03:49 PM
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United States, CT, Wethersfield
Joined Mar 2006
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1:12 Radar

001 (0 min 13 sec)

Here is the 1:12 radar Patmat printed for me .
It has a micro servo hacked for a motor, I have to add a resistor to slow it down
It runs very smooth its the video that makes it look jumpy
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Old Sep 15, 2014, 06:39 PM
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Umi_Ryuzuki's Avatar
PDX, OR
Joined Dec 2002
10,273 Posts
Seems like it is turning too fast,... 60rpm should be plenty.

Unless you are plotting intercepts with incoming drones or quad copters.

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Old Sep 15, 2014, 07:28 PM
"Take the Cannollis"
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Lake Martin ALABAMA
Joined Feb 2006
877 Posts
Man, that's not a radar....it's a helicopter.

Way too fast
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Old Sep 15, 2014, 11:38 PM
Boats on the brain!!
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Arnold, Mo.
Joined Jul 2005
4,582 Posts
Radars turn at two speeds, 13 and 26 rpm.
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Old Yesterday, 03:42 AM
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Blackpool, Lancs
Joined Feb 2006
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Scaling the speed accurately for 1:12 gives 45 or 90 rpm - but slower would probably look more convincing.
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Old Yesterday, 10:25 AM
Veni, Vidi, Feci
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Motor City
Joined Dec 2004
12,419 Posts
Looks great, I have a happy!

For best motor control (for low current applications), don't just put a single resistor in series with the motor. Use a "voltage divider" with two resistors and a center tap, or a potentiometer (adjustable version of the same thing).


12v between Vin and ground; connect motor leads to the center tap and ground.
If the resistors have the same value, then you'll have 6v at the center tap.
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Old Yesterday, 12:04 PM
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PDX, OR
Joined Dec 2002
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This works really well also.

https://www.dimensionengineering.com/products/de-swadj

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