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AlignRC Thunder Power RC
T.J.

Veteran

St. Louis

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Nothing like a head shot! Evolution Rush 700

Thanks, T.J.

07-05-2016 05:46 PM
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icanfly

Elite Veteran

ontario

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nice pic.

so happens my customized Shuttle, 450's, 300 have nylock nuts since I make my own feathering and main shafts for the most part. I'm just that way, are you?

I have a box worth of aircraft cinch nuts that have slits on the tapered end and form a mechanical bond when tightened on, they're too large for anything hobby.

anyone see the Banshee 850? 850, you should see the way one can fly, wow..

07-06-2016 01:15 AM
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T.J.

Veteran

St. Louis

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Actually on the evolution rush 700 this is the type of spindle that comes with it. I don't have the tools necessary to make these kind of things other than a dremel. Lol

Thanks, T.J.

07-06-2016 01:23 PM
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Dan Minick

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Columbus, WI

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I have had Nyloc nuts back off in the past. I would still use red loc-tite.

Team Synergy, Team FBL Rotors---Formerly Dyecocker1-------if its not broke...it will be!

07-06-2016 10:09 PM
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icanfly

Elite Veteran

ontario

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I noticed the hf topic of the same thing, that must be you who ran it op. You guys went to bat on things I've gotten past already (sorry can't participate in those reindeer games).

There's a certain way nylocks are used either to lock up on a machined stop or as in skateboard trucks clamp all bearings and spacers together (skateboarders preferring the wheels ride free with only the nylock holding the nut on).

One thing I've learned in the past is to trust your feel for resistance, if the nut goes on like there's no nylon locking, what I've done is take a hammer and flatten the nut a bit where the nylon is to compress it, mash it a little as it were, and the nylock nut is good for a few more turns, then replace it completely, they are cheap.

07-07-2016 04:02 AM
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TMoore

rrMaster

Cookeville, TN

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Bad design. Spindles with locknuts are not as strong as a spindle with a rollformed hole. Sorry to say.

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07-07-2016 08:30 PM
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rcflyerheli

Key Veteran

Granbury, TX USA

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It's funny, as IMHO things seem to evolve into a big loop. I remember that there was an issue with Align 700 tails having the bolt break on their 700 tails. then Gaui came out with the tail hub that used the lock nuts, and after a while, they started having issues with the hub breaking at the shoulder where the threads started.

Then Align had issues with the DFC bolt breaking at the shoulder where their threads started, and now, here we are with another round of a spindle with threads and locknuts.

I honestly have to say that there is no one absolute best way. Each has advantages and disadvantages. I prefer the threaded spindle and locknut for ease of installation, because if the tolerances on the shoulder to shoulder length aren't consistent, the locknut doesn't require a hard seating to keep it fixed, whereas the spindle bolt does.

However, putting loctite on the nylon lock doesn't do it any good, and it might degrade the strength of the nylon, like CA does.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
Amain Team Rep

07-07-2016 10:29 PM
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airboss

Elite Veteran

OC ,california

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SAB KSE700 spindle assembly is bulletproof and we all know Align has had quality issues for a decade or so.

Urukay HPS3 KSE 700 HPS3

07-08-2016 03:43 AM
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TMoore

rrMaster

Cookeville, TN

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There are several problems with a spindle that used external threads on the end of the shaft.

1. That type of spindle forces the hole in the blade grip to be larger than normal and reduces the area that is available for the blade grip. See the photo in the first post and you'll see what I'm talking about.

2. External threads machined on an 8mm shaft will be either cut or rolled. If you roll 8mm threads on an 8mm shaft you will have to turn the shaft down to the pitch diameter before rolling. I have not seen rolled threads on traverse shafts and if you are interested in maximum strength you will need to follow NHTSA standards and roll them. If the threads are cut the maximum strength will be based on the minor diameter of the thread form and cutting by design interrupts the material flow and will fail sooner than a rolled thread design.

3. Fastener designs work best when there is some stretch or torque applied to the fastener thread system. This is why you torque heads on engines, torque the nuts on your wheels and apply torque/stretch on other applications that require tension to apply force. A traverse shaft with external threads that are turned and necked or grooved for clearance and cut will not be as strong as one with a properly tapped thread. You will not get any stretch on this system with a locknut before you strip the end of the spindle off.

http://shop.evohelicopters.com/Spin...M8-1_p_115.html

Take a close look at this spindle in the link above and you will see where the external thread is machined to just under the thread OD and then chased or cut to create the thread form. This is not a strong shaft design. In the link above it is clear that the threads are smaller than the shaft OD despite what the description says. It may look strong but if you do FEA on this design you will be disappointed with the failure modes and stresses on the part. Rolled threads would make it better but it's still not as good of a design as a shaft that used a cap screw and washer to retain the bearings in the blade grips.

This design keeps on coming around from time to time and it's not a great design, IMHO.

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07-08-2016 04:38 AM
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