12 replies to this topic

[Ben Naelitz]

what would work best?

[DOCinCanton]

Are you asking about Loctiting the set screw or the entire gear hub?

[Dominator]

Are you still planning on using a set screw? I know some racers in wing and scale will use epoxy but sure of the brand.

If your just trying to keep the swr screw from coming loose here are a couple things to do:

1. With the gear off the axle run the set screw through the hole then use a reamer to clean up the axle hole on the hub.

2. Place the gear on the axle and apply blue lock tight on the set screw then tighten on the axle. You can also use an axle with flats.

[swodem]

I have done some of this and it’s risky stuff. If they let go it’s race over.

Always ensure surfaces are very clean, use solvents on axle and inside gear boss. You may also like to rough the surface a little (when using the epoxy, not the Loctite).

Loctite 620 (edit) 638 is the best of the retaining compounds and I don’t think it’s let me down (only used in FK motors though)
Loctite 680 is good but I have had occasional and eventual failures.
They both will lock up quickly once assembled but still need 24hrs to fully set

I have also used a UHU 2part Resin Epoxy, it hasn’t failed and I have used this up to G12

http://www.hobbiespl...640-p-2371.html

Hope this helps you.

I’m interested in others experiences on this too



Sent from my iPhone using Tapatalk Pro

[Eddie Fleming]

Use a setscrew and be done with it. That is what everyone does and it works.

 

That said if I were Loctiting a gear on an axle I would use Loctite 680 Retaining compound. I starts to setup quick so you need to get the gear in position quick with a even coating of compound. Make some test before trying it on good parts. I use 680 to install pinions on motors but do not let it get into the motor bushings at all.

 

Good luck

[swodem]

Use a setscrew and be done with it.....

....I use 680 to install pinions on motors but do not let it get into the motor bushings at all..

Use solder and be done with it...


Sent from my iPhone using Tapatalk Pro

[swodem]

Edit. Just looked in the fridge

It’s Loctite 638 (not 620) that’s the superior Retaining Compound




Sent from my iPhone using Tapatalk Pro

[Eddie Fleming]

Use solder and be done with it...


Sent from my iPhone using Tapatalk Pro

I soldered pinions for years with great success, but for the last couple of years I have been using 680 with great success. Whatever works for you.

[kvanpelt]

I use the Loctite 638 for my Eurosport stuff.  I have had them let go, very risky but doable. Things must be cleaned well with solvent.

 

The safest and best for me, is to notch axle where the set screw touches, remove set screw and replace with 4-40 aluminum threaded rod, tighten threaded rod, cut off, and turn down both the boss and rod with your lathe. The only failure I've experienced with this is when I've taken the boss down to a very small diameter.

 

Some of the other 1/32 eurosport racers will glue the gear on and remove the entire boss so they don't need the reverse hub wheels usually required for 32ES. I've tried this for practice, but has eventually failed for me. 

[swodem]

KVP is that both Glue (or 638) and Aluminium threaded rod?

Or just notch and Alloy rod?


Sent from my iPhone using Tapatalk Pro

[kvanpelt]

Steve, yes 638 glue and the threaded rod before turning boss down. Credit to my friend George Russell for this recommendation!

 

I had some failures with the glue only. Since adding the threaded aluminum rod for that little extra insurance, I've only had one failure which I attribute to getting a bit too aggressive in my machining of the boss.

 

The failures that I had with the glue only appear to be heat related. I could run dozens of laps without fail, but after car had a complete cool down and I would take the car back out, within a couple laps the gear would let go.

[swodem]

I soldered pinions for years with great success, but for the last couple of years I have been using 680 with great success. Whatever works for you.

Eddie
I think my post went right over your head


Sent from my iPhone using Tapatalk Pro

[Eddie Fleming]

Eddie
I think my post went right over your head

It probably did I am a very shallow thinker.