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2 pages [ <<    <    ( 1 )     2     NEXT    >> ]2015 viewsPOST REPLY
Real Raptors . Mikado Modellhubschrauber . GrandRC

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Main Discussion > Circular Travel Limiter
 
 
Leif
Elite Veteran
Location: Oxford, PA - USA

The last thread on cyclic rings sure went on long enough. Long enough to get me researching. During my research, a comment made by Malorie in a thread from two years ago got my interest.

From that comment, the Circular Travel Limiter was born.



Material Cost: A few dollars at most
Made from a plastic Easter egg and a spare lower stick nut.

Time to Build: 30 minutes
Tools Needed: Cordless Drill, 3mm drill bit, M3 bolt and nut (to hold part while turning), File or Sanding Block, sharp scissors
Directions:
1. Drill 3mm hole in bottom of egg.
2. Rough-cut excess material with scissors.
3. Mount on M3 Bolt and tighten nut.
4. Chuck in cordless drill.
5. While turning, file or sand down to size.
6. When done, file nut down to size
(I used 5mm for shortest stick length)



Easy Installation - Installs and Removes in seconds.



Does not permanently modify your radio. Available in a wide variety of colors! Works with most Futaba radios and Realflight controllers. Don't know about JR, since I don't have access to one of those.

Leif
04-05-2005 Over year old.
 
 
BlakeMcBrayer
Elite Veteran
Location: Georgetown, Ky

Looks and sounds good, but what the heck is it made out of?

Don't come off the throttle untill you see your GOD!
04-05-2005 Over year old.
 
 
Leif
Elite Veteran
Location: Oxford, PA - USA

I modified the original post with details. See above.

Leif
04-05-2005 Over year old.
 
 
BlakeMcBrayer
Elite Veteran
Location: Georgetown, Ky

Cool!!

I'm off to raid the kids room!

Maybe I'll find on that is a cool color and still has candy in it!

Don't come off the throttle untill you see your GOD!
04-05-2005 Over year old.
 
 
orlee008
Veteran
Location: Miami, FL USA

very clever!!! havent seen that around yet. you might have to patent that!
Would it get in the way for the people that "pinch" the sticks?


orlee

Flying in Miami, FL (Kendall Area)
04-05-2005 Over year old.
 
 
TMoore
rrProfessor
Location: Cookeville, TN

I did the same thing with a machined delrin ring on top of my TX stick but I like this idea better. It looks slick, is non invasive and doesn't leave residue on the stick face from double stick tape. Plus it goes on and off at will.

Good idea! How does it feel when you stir the stick?

TM
04-05-2005 Over year old.
 
 
darkfa8
Key Veteran
Location: Eatontown, NJ, USA

i have a large Futaba servo wheel with a hole in the middle opened upto the 10* mark, or 25mm in diameter.. snaps right into the controller and works very well. Cost = $0

- Dan G. -
04-05-2005 Over year old.
HOMEPAGE  
 
 
Leif
Elite Veteran
Location: Oxford, PA - USA

orlee,

I don't think it would be a problem for "pinch" pilots, unless you're used to putting your pinch fingers below the knurled parts of the nut.

I ground down the lower nut so that I get the shortest stick length possible, since I use thumbs only and like a short stick. For those who like the pinch method, you would probably be using a longer stick length. This would mean you wouldn't grind the lower nut as small.

TMoore,

It feels great. It rides very smoothly, since the bell actually rides against the inner ring of the gimball assembly. A machined version made from Delrin would probably be nicer. I offered the design to Augusto at Carbon Extreme, but they didn't think the market was big enough to tool up and make them. Can't think the patent would be worth much to anybody except the radio manufacturers (if they decide to make this a standard radio feature). After all, there's still the ring design as an alternative.

darkfa8,

Everything has a cost... I priced this as if you were going to go out and buy the parts new (which of course I did not). I could have reduced the cost to essentially zero if I used standard M3 nuts to hold this thing on instead of grinding down a spare knurled nut. The ring design works, and has been published in several versions. This is just another way to get the same functionality.

Leif
04-05-2005 Over year old.
 
 
coop
Senior Heliman
Location: Bainbridge, NY

...

...Still think this is more simple...

Coop
04-05-2005 Over year old.
 
 
Leif
Elite Veteran
Location: Oxford, PA - USA

Yep Coop, that works and is definitely easier to make.

Only problem is that doesn't work with the Futaba radios. If you check the pic of my 8U, you'll see that they have arrow-shaped bumps on the silver upper ring. To get the correct alignment with the lower black ring on the gimball, you need something that is several mm lower down on the stick.

Looks like the design works on JR also, just with slightly different dimensions.

Leif
04-05-2005 Over year old.
 
 
THX1138
Elite Veteran
Location: Plainfield, IN

coop

I too have an 8103 and was wondering what you used for your "circular travel limiter".

Lou

Back off man, I'm a scientist.
04-05-2005 Over year old.
 
 
scotter
Senior Heliman
Location: Elkton, MD

Sure looks like a servo wheel to me. A used one at that. The simple ideas are the best ones....
04-05-2005 Over year old.
 
 
w.pasman
Elite Veteran
Location: Netherlands

Nice alternative solution, and looks funny!


But I think I prefer the standard servo wheel:
* Costs $0
* Stick length does NOT matter, you can change the stick length at any time without need to modify the limiter
* Clicks straight on of off into my FF8, nothing double stick tape or so. I dont even need to unscrew part of the stick.
* Does not modify the transmitter too.
* Sturdy, you can't break a transmitter wheel by pushing hard into the corner (I suspect that the stick will break first).
* But most importantly, the wheel is really round while I suspect that your solution will ride a bit bumpy at the extremes, because the transmitter surface is not flat under the stick.



http://graphics.tudelft.nl/~wouter/...vellimiter.html
04-05-2005 Over year old.
HOMEPAGE  
 
 
Leif
Elite Veteran
Location: Oxford, PA - USA

Actually, the limiter pushes mainly against the side-wall of the inner ring. You'll notice that there's a smooth space between the "bumps" you mentioned and the wall. Since the plastic is only 1mm thick, it rides in this smooth area.

Of course the servo wheel approach works just as well.

Leif
04-05-2005 Over year old.
 
 
w.pasman
Elite Veteran
Location: Netherlands

Good thinking about this detail!
How sturdy is your solution? In my memory those eggs are either very flexible or brittle.
04-05-2005 Over year old.
HOMEPAGE  
 
 
w.pasman
Elite Veteran
Location: Netherlands

Quote 
If you check the pic of my 8U, you'll see that they have arrow-shaped bumps on the silver upper ring. To get the correct alignment with the lower black ring on the gimball, you need something that is several mm lower down on the stick.


Strange I have an 8U (to be exact an 8UPSHX or so I think ) too - see my photo above - but never had problems with those 'arrows' In fact they provide a kind of mechanism that make the ring click into place. If your arrows point out a bit further, you could sand slight dents into the ring at the four corners.
04-05-2005 Over year old.
HOMEPAGE  
 
 
Leif
Elite Veteran
Location: Oxford, PA - USA

Of course the material leaves something to be desired, but it seems sturdy enought to me. I can slam the stick into the corner and it won't break.

The arrows aren't a problem for your "ring" modification, as you pointed out, they actually help. They ARE a problem for the use of a small servo wheel as the stick-based limiter as shown by Coop. The dimensions of the Futaba radios would have the wheel hitting on the metalized ring where the arrows are, giving you a bumpy ride.

I guess we'll still be having these discussions as long as the radio manufacturers ship heli radios with square cyclic-gimballs.

Leif
04-05-2005 Over year old.
 
 
coop
Senior Heliman
Location: Bainbridge, NY

THX 1138...That is just an aluminum servo wheel, drilled the hole out, took stick knob off, installed wheel, screwed knob back on...
04-05-2005 Over year old.
 
 
w.pasman
Elite Veteran
Location: Netherlands

Quote 
I guess we'll still be having these discussions as long as the radio manufacturers ship heli radios with square cyclic-gimballs.


Of course they want to make one type, also useable for mode 1 and also for planes. Square is simple and standard, the heli mode 2 situation is very special and it's just fortunate that this problem has such a simple solution when flying mode 2.
04-05-2005 Over year old.
HOMEPAGE  
 
 
w.pasman
Elite Veteran
Location: Netherlands

Quote 
The arrows aren't a problem for your "ring" modification, as you pointed out, they actually help. They ARE a problem for the use of a small servo wheel as the stick-based limiter as shown by Coop.


Ah apparently I misunderstood that.
04-05-2005 Over year old.
HOMEPAGE  
 
 
2 pages [ <<    <    ( 1 )     2     NEXT    >> ]2015 viewsPOST REPLY
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