Trex 700n dfc elevator servo mount??? Help

[jayfrs]

Hi guys

am I missing some thing here I have a trex 700n dfc and I can’t get the servo horn to fit inbetween the frame I had to unscrew the servo to attach the horn. I have taken some pics! It looks like the mount is to wide? The servo is an align ds820

https://flic.kr/p/YaSHxR

https://flic.kr/p/YNbgzy

[Justin vaughan]

Yep have to remove servo, to install the horn . Pain in the ass , only downside to the 700n ����

[jayfrs]

It when the horn is fitted I cant get the servo in coz of the nuts hit the frame. When the servo is in the mount and fitted should the servo back plate be sitting flush with the outter side frame? Mine isn’t?

[Justin vaughan]

Yep the servo mount should pull up flush to the L/H side frame.

[jayfrs]

Ok I will have a look tomorrow something ain’t right. Cheers

[nkma]

Hi guys

am I missing some thing here I have a trex 700n dfc and I can’t get the servo horn to fit inbetween the frame I had to unscrew the servo to attach the horn. I have taken some pics! It looks like the mount is to wide? The servo is an align ds820

https://flic.kr/p/YaSHxR

https://flic.kr/p/YNbgzy

Align DS820 is some 1.7 mm higher than e.g. DS610/DS615.

Try first to remove the rubber you have between the servo and the servo mount. If that does not do it, you have (at least) three options:
– Modify the servo mount by grinding it down 1-2 mm, whatever is needed. Check if you need to deepen the holes and M2.5 threads.
– Get a plastic servo mount (HN7074), that is easier to modify. A weakness is that the plastic threads are easy to destroy.
– Make your own servo mount.

I recommend the grinding, if you have the tools or can get help with it. I made a mount some time ago from aluminum that I had. I am not near it now (no pics), but I made it from 2 L-pieces and a flat piece of Alu. The hardest part (for me) was to get the M2.5 threads good. Partly the problem was that threading tools for <M3 not are so common. It could have been 20x20x3mm (L) + 20x1mm (flat) alu I used.

/Bo

PS: Before you start to grind, if you do that, check if there is the necessary space under the bottom of the servo. It seem to be some 1.5-2 mm on your pic, but check first!

[nkma]

Hope you got this resolved jayfrs.
Finally got a pic of the servo holder I made from some aluminum I had, 2x30 mm flat and 4x25 mm L-profile. I got a shelf for the FBL-controller on top of it, too.



3D-printing is probably another way to make your own servo holder, if that is necessary.

/Bo

[jayfrs]

Yes mate I took the rubbers off the servo and it gave me just enough clearance!

[nkma]

Yes mate I took the rubbers off the servo and it gave me just enough clearance!

Great! I love simple solutions!

I don't know if it is a concern and I never flied nitro, but I have seen warnings about what nitro vibrations can do to servos. What I have seen on forums, but can not confirm, is that the vibrations can cause damage on the potentiometer in the servo that then gets jittery. That could be just an urban legend to...

If it works well and flies well, just enjoy!

My solution was a lot more work than yours, but my alternative was to wait a week and at the time I did'nt have the patience for that...

/Bo

[jayfrs]

[QUOTE=nkma;1224423]Great! I love simple solutions!

I don't know if it is a concern and I never flied nitro, but I have seen warnings about what nitro vibrations can do to servos. What I have seen on forums, but can not confirm, is that the vibrations can cause damage on the potentiometer in the servo that then gets jittery. That could be just an urban legend to...

If it works well and flies well, just enjoy!

My solution was a lot more work than yours, but my alternative was to wait a week and at the time I did'nt have the patience for that...

/Bo[/

Yeah mate it was a simple solution not sure if it was the best one but it worked and it flys awesome. Only time will tell how the servo holds up to the vibrations not to concered about it!