TJ Magnet location

[marked23]

I test fit everything about the engine, including the bracket for my Throttle Jockey. It looks like the magnet should be mounted right in the middle of that line on the bottom of the fan (extreme) where the bevel starts.

Does that sound about right?

Also, I'm guessing that the TJ bracket mounts in such a way as it is on top of the engine mount, and not underneath it. That is to say, the screw goes through the TJ bracket first, then the engine, then into the mount.

-Mark

[Russ McC]

Hi again Mark,

I have not used the TJ but the GV-1 is probably very similar in mounting. The GV-1 bracket mounts just as you describe mounting your bracket. The position of the magnet is determined by the width of the motor mount and the construction of the sensor, the magnet should end up very near the bevel on the bottom of the fan as you described.

[Rob Stump]

Yes Russ, it's pretty much the same just different sensor. The location marked23 is stating sounds right on the Extreme cnc fan.

Marked23 you can use a drill press for accuracy and depth. I'm pretty sure there are directions on the Model Avionics website too just in case.

Regards,

[marked23]

Thanks guys,

Whoops! I drilled through my fan. I didn't mean to do that. However, it looks like that it needed to be drilled through in order to get the magnet to seat deep enough to be flush.

Did screw this up? I was thinking that the glue was supposed to grab the bottom of the blind hole in order to have some surface area to hold on to. Now that the hole goes all the way through, the glue will only have the sides to hold on to. Will this be enough? I'll be using some slow epoxy.

-Mark

[WillJames]

It will be enough. I have a few fans that are all the way through. Just make sure and balance it before you sue it. Also dial indicate it using the technique DavidH posted at the top of the glow forum on how to tighten it while dial indicating it. I got my last one to less than .001 suing the technique David posted. :)

[Rob Stump]

Mark, the magnet doesn't have to be flush with the fan surface but it does have to be recessed into the fan a bit for security. It's just a good idea to have it parallel to the sensor surface.

To keep things from getting messy just cover the hole by putting some scotch tape on the side of the fan with the fins, mark your magnet face with a marker to ensure you have the right polarity facing the sensor, put just enough epoxy to cover the bottom of the hole and then some. Now you can just drop the magnet in the hole (correct polarity facing the sensor) and it should sink. It will push any excess epoxy up and out around the magnet edges. You can wipe off any excess. Just be very sparing with the epoxy. You can always add a little here and there as you go if needed. After it dries pull the tape off and balance as Will stated.

Regards,

[marked23]

I did the tape trick. The glue is drying right now.
BTW, the fan is in better balance now... not perfect yet, but closer is better.

Thanks for the tips guys.

-Mark