Hi Stan, Stefan, Tricotosa
Yes, I’m using 0.2mm wire. Unfortunately this was the thicker wire I could get and the price was very nice. So I will
test with this and see
what can I get before looking for 0.4mm wire
I’m usind a DC motor, so speed is never a problem because you can slow it down with any PWM controller keeping a high
torque
Anyway this motor is for 24VDC and I’m using it at 12VDC. It has a planetary reduction gear and couples into a slewing
gear which
adds more reduction. See the pictures in links:
https://www.dropbox.com/s/h38e927b0odwqns/IMG_20190218_161653_954.jpg?dl=0
https://www.dropbox.com/s/53qgmegdtm00nro/IMG_20190218_161707_381.jpg?dl=0
To support the plastic bucket I used a rotary stand for old tube TV sets. The bottom of the stand keeps steady and the
top section rotates
with the motorized axis
https://www.dropbox.com/s/wopp4i8h4r7htew/IMG_20190218_161725_973.jpg?dl=0
The bottom of the bucket includes holes for draining. The upper senction of the stand has screws which fit in the holes
and drag the
bucket for rotation
https://www.dropbox.com/s/d01uk1dmz2ax0wd/IMG_20190218_161808_596.jpg?dl=0
Is important to be able to rotate the buck back, manually. To correct any wrong winding
73 de Luis
EA5DOM
Maybe i can contribute something here:
Luis' wire is 0.2 mm diameter, not 0.02 mm.
I would recommend to use a bigger wire if you have enough space. 0.4 mm is much more comfortable to wind and it holds a 500 mA in a stacked configuration.
If your motor is to fast, just try to switch a resistor in series. This has the advantage that the torque, or the force which pulls the wire is lower and you can manually regulate the motor speed by holding the wire a bit stronger/lighter.
This has worked very well here.
73, Stefan
Am 18.02.2019 14:49, schrieb Stan, W1LE:
Hello Luis,
Thanks for the update. I am in the midst of starting to think about winding a loading
coil for the 50 foot vertical in the front yard.
What is the revolutions per minute of your rotary table ?
What speed are you most comfortable with ?
I am also thinking of a nested "bucket brigade" for a tunable loading coil.
My initial thought was to use a lathe and I built up a jig to horizontally hold the 5 gallon plastic bucket.
Unfortunately I could not get the speed low enough to allow me to comfortably wind the single layer coil.
The lathe has a DC motor and the DC drive board could not be adjusted low enough. I think I need about
0-20 RPM. 0.02mm solid wire is about a #32 AWG or a #36 British WG, rated at ~ 90 milliamperes.
My initial thought was to use a wide double sticky tape at about 4 locations on the bucket, about 90 degrees apart.
I am also considering a tape over the entire coil after winding to hold everything in place.
Another thought is a clear UV proof epoxy over the entire coil, to hold in place.
My concern is the derating of the current due to the reduced dissipation of heat in the covered coil.
Back to the drawing board..... My coil winding will start with #22 AWG from a 4.4 Kg spool.
Stan, W1LE Cape Cod FN41sr
On 2/18/2019 7:20 AM, VIGILANT Luis Fernández wrote:
Hi Stefan, VLF
The "Tricotosa" works nicely. Added a pedal to activate the motor, which is very useful
