Weak diseqc rotor assistant

[Trust]

#1
For a diseqc rotor behind a heavy dish with several lnb's , its hard working to bring it back from a far east or west position .
To help the rotor doing that , the STAB rotor has a system with spring inside .
I've never seen such system in any other rotor , so I thought about making that for the Moteck type rotors .
Made a kind of drum around the elbow pipe with a steel cable , two pulley's and two springs with adjustable tensioners .
Started with a empty SG2100 , just with the main shaft , with equal tension the elbow shaft is on zero .
The springs are pre-tensioned to keep the cable on the drum when turning to the other direction .
To keep de drum fixed to the pipe , I made two shells that kept in place by replacing the M8 X 50 pipe bolt by a longer one , and covered by a piece of alu pipe .
For the final test I have to buy a longer steel cable and put back the motor and worm in the SG2100 .
Will do the test with the CM 1.2 and the 5 lnb revolver and noticing the current turning with and without the spring assistant .

If its working OK I will it also make at the Twoteck .

 

[Magic Static]

I used a series of six springs, three on each side that engaged in steps. The dish was lighter at the horizon than the middle of the arc. But it wouldn't handle a wind load. I'll be interested in seeing the final outcome. You have better tools than me

 

[Trust]

I used a series of six springs, three on each side that engaged in steps. The dish was lighter at the horizon than the middle of the arc. But it wouldn't handle a wind load. I'll be interested in seeing the final outcome. You have better tools than me

I like to see pictures of your system .

 

[Magic Static]

I like to see pictures of your system .

From years ago a thread I posted about it.
USALS on CBand project FAILED

But there is more than one way to"skin a 1.2m" A few months ago I did it this way.
? offset angle Primestar 1.2m

 

[Trust]

Nice story , never read it before .

 

[Trust]

I used a series of six springs, three on each side that engaged in steps. The dish was lighter at the horizon than the middle of the arc. But it wouldn't handle a wind load. I'll be interested in seeing the final outcome. You have better tools than me

The empty rotor has a current of 130/150 mA .
Added the springs , each time one spring is almost idle when the rotor is in that end position , and the other spring has a load of ± 100 kg
When the rotor is at Zero , both springs had a load of ± 25 kg

Turning to 70º E with 290 mA , back to zero starts with 180 mA later 160 mA
Turning to 75º W with 330 mA , back to zero starts with 200 mA later 160 mA

Than I put the 1.2m CM with lnb revolver (15.5 kg ) with the adapter plate and clamp (4.2 kg) on the rotor , as high as possible at the elbow pipe .
Turning to 70º E with 170 mA , back to zero starts with 330 mA later 260 mA
Turning to 75º W with 170 mA , back to zero starts with 290 mA later 250 mA

Unhooked the springs
Turning to 70º E with 150 mA , back to zero starts with 400 mA later 360 mA
Turning to 75º W with 150 mA , back to zero starts with 360 mA later 330 mA

attached the dish as low as possible and 44 mm closer to the elbow pipe and put the springs back .
Turning to 70º E with 160 mA , back to zero starts with 180 mA later 170 mA
Turning to 75º W with 160 mA , back to zero starts with 220 mA later 170 mA

Unhooked the springs
Turning to 70º E with 150 mA , back to zero starts with 280 mA later 250 mA
Turning to 75º W with 150 mA , back to zero starts with 270 mA later 250 mA



For the bearings in the rotor the best way is to attach the dish high as possible at the elbow pipe .
But the weight of the dish acts lower when its more close to the polar axis when attached as low as possible .
@Rimants made once a special polarmount about this issue

Channel Master 1,2m issue