RunRyder RC
WATCH
 1 page 773 views POST REPLY
Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › How to read the linkage ball spec?
12-29-2014 03:30 AM  5 years ago
Topic Vote0Post 1
rudyy

rrElite Veteran

E. Amherst, NY

MyPosts All Forum Topic
How to read the linkage ball spec?
Does anyone know how to read the spec? What is the difference between the two below?

Linkage ball C(M2x5) x 16(Φ5x10mm)
Linkage ball C(M2x4) x 16(Φ5x9mm)
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
12-29-2014 03:34 AM  5 years ago
EEngineer

rrProfessor

TX

MyPosts All Forum Topic
I believe the 1st has studs(could be bolts) with M2 threads...and the ball itself is 5mm in diameter.

The 2nd has M2 threaded studs(bolts) with 4mm balls...

The length of the stub is not clear from your post...

Could be that the bolt is 9/10 mm for the 4/5 mm balls after the ball is on the bolt.

FWIW
SHARE  PM  EMAIL  Attn:RR  Quote
12-29-2014 03:38 AM  5 years ago
rudyy

rrElite Veteran

E. Amherst, NY

MyPosts All Forum Topic
Is Φ5 the ball diameter?
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
12-29-2014 03:40 AM  5 years ago
EEngineer

rrProfessor

TX

MyPosts All Forum Topic
I would think so...
SHARE  PM  EMAIL  Attn:RR  Quote
12-29-2014 03:42 AM  5 years ago
EEngineer

rrProfessor

TX

MyPosts All Forum Topic
But, I would call and find out...to make sure...

Could be a spec typo....
SHARE  PM  EMAIL  Attn:RR  Quote
12-29-2014 05:24 AM  5 years ago
dkshema

rrMaster

Cedar Rapids, IA

MyPosts All Forum Topic
Is Φ5 the ball diameter?
Yes.

What build/manual are these specs from?

-----

OK -- a little research, here is your answer:
Linkage ball C (M2x5) x 16 (Φ5x10mm)
This is Linkage Ball "C", from an Align 700 kit.

The ball has 2mm metric threads (M2) and the threaded portion (shank) is 5 mm long. That takes care of the "M2 x 5" piece of the puzzle.

"x16" means there are 16 of these in the bag.

"Φ5" tells you this is a 5mm diameter ball.

"x10" is the overall length of the ball and threaded shank -- stick the entire part between a set of calipers, it will measure 10mm overall.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
12-29-2014 06:04 AM  5 years ago
EEngineer

rrProfessor

TX

MyPosts All Forum Topic
"x10" is the overall length of the ball and threaded shank -- stick the entire part between a set of calipers, it will measure 10mm overall.
Why the 9/10 mm delta?.....

Between 2 different 5 mm M2 ball bolts?....
SHARE  PM  EMAIL  Attn:RR  Quote
12-29-2014 06:22 AM  5 years ago
dkshema

rrMaster

Cedar Rapids, IA

MyPosts All Forum Topic
Why the 9/10 mm delta?
Because one of the parts has a 4mm long threaded portion. The other one has a 5mm long threaded portion.

Each of them has a 5mm diameter ball.

Why does one have an extra millimeter of threaded shank?

Why can you go to a hardware store and buy 4-40 x 1/4 inch long machine screws, and 4-40 x 5/16 inch long machine screws?

Answer -- because in some instances, the extra 1/16 inch of thread is required in a particular design. They're both 4-40 machine screws, aren't they?

With regard to the Align parts, it could be someone decided that an extra millimeter of thread engagement was needed in the design to insure an adequate amount of threads were present in the assembled portion.

Or, in one spot in the assembly, a 5mm diameter ball is needed, but there is only enough material thickness present for a 4mm threaded shank, and not a 5mm threaded shank. Somewhere else, a 5mm long threaded shank is needed, along with a 5mm diameter ball.

Think up on a rotor head, swashplate, mixing arms, where the material thickness varies, but the plastic ball links all require a 5mm ball.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
12-29-2014 06:30 AM  5 years ago
EEngineer

rrProfessor

TX

MyPosts All Forum Topic
Who knows, Dave....

I'm taking this...as the OP wants to get the correct balls...with enough thread length....and such that it fits his servo arms...

And his ball cups on the link end...
SHARE  PM  EMAIL  Attn:RR  Quote
12-29-2014 06:38 AM  5 years ago
dkshema

rrMaster

Cedar Rapids, IA

MyPosts All Forum Topic

All 4.75 mm diameter balls, some with M2, some with M2.5 threads, some with M3 threads, some slightly longer, some slightly shorter.

If the OP needs to know WHICH balls to use, the dimensions of each ball used in the kit are shown in the assembly manual where used.

Whatever his purpose, he now knows how to decode the sizes, and from there can figure out what he needs. He now knows how to fish and can eat forever.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
12-29-2014 06:42 AM  5 years ago
EEngineer

rrProfessor

TX

MyPosts All Forum Topic
OK....
SHARE  PM  EMAIL  Attn:RR  Quote
12-29-2014 06:48 AM  5 years ago
EEngineer

rrProfessor

TX

MyPosts All Forum Topic
He now knows how to fish and can eat forever.
Nice...
SHARE  PM  EMAIL  Attn:RR  Quote
12-29-2014 01:20 PM  5 years ago
rudyy

rrElite Veteran

E. Amherst, NY

MyPosts All Forum Topic
Thank you.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 773 views POST REPLY
Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › How to read the linkage ball spec?
 Print TOPIC  Make Suggestion 

 2  Topic Subscribe

Monday, April 6 - 2:56 am - Copyright © 2000-2020 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online