Author Topic: Caliper animation  (Read 7067 times)

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Offline SohRon

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Caliper animation
« on: October 10, 2013, 12:14:09 am »
Every year we take off into the mountains for a week or so and live as primitively as possible. Seems like something semi-tragic manages to happen each time; once, while we were gone lightning hit the house and took out my computer, for instance.

Well this time I managed to break my foot (don't ask how   :-[ ), so I'm laid up here unable to move and wondering what to do. Seemed like the time to fool around with the computer, so I made this little gif file showing the action of the front caliper. I had a sectioned caliper handy, so I set it on the copier and got the basic shapes, then went from there. I hope you find it interesting, if not informative!

This shows the braking sequence from rest to full braking action. Note that the moving pad connects first which then forces the caliper to move, activating the fixed pad. Also, note that the piston seal distorts with the movement of the piston, then drags the piston back when pressure is released. The arrows indicate application and release of the brake lever.

All of the gaps and motions are exaggerated in this gif to make things a bit more clear; the total movement of the piston is actually in the .012" range, which would be hard to see in this vid. (EDIT: See post #18 below for a better version of this if you want a copy)

« Last Edit: October 10, 2013, 01:07:46 pm by SohRon »
"He slipped back down the alley with some roly-poly little bat-faced girl..."

Assembling my '74 CB550: http://forums.sohc4.net/index.php?topic=86697.0
Assembly of the Right-hand Switch (a rebuilder's guide):  http://forums.sohc4.net/index.php?topic=80532.0
Installing stock 4X4 exhaust: CB500-CB550 K: http://forums.sohc4.net/index.php?topic=82323.0
CB550 Assembly Manual: http://forums.sohc4.net/index.php/topic,151576.0.html

Offline TwoTired

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Re: Caliper animation
« Reply #1 on: October 10, 2013, 12:53:29 am »
Nicely Done!
Lloyd... (SOHC4 #11 Original Mail List)
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Offline dave500

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Re: Caliper animation
« Reply #2 on: October 10, 2013, 12:55:26 am »
yeah bloody beautifull,now do a 550 transmission please.

Offline flatlander

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Re: Caliper animation
« Reply #3 on: October 10, 2013, 01:01:47 am »
neat, and very clear!

Offline 70CB750

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Re: Caliper animation
« Reply #4 on: October 10, 2013, 01:25:39 am »
Great job!  Do you mind if I grab a copy?

Offline SohRon

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Re: Caliper animation
« Reply #5 on: October 10, 2013, 01:36:32 am »
I have better versions available if you want a copy. Check back tomorrow and I'll try to post something.

Thanks to all for your kind comments.
"He slipped back down the alley with some roly-poly little bat-faced girl..."

Assembling my '74 CB550: http://forums.sohc4.net/index.php?topic=86697.0
Assembly of the Right-hand Switch (a rebuilder's guide):  http://forums.sohc4.net/index.php?topic=80532.0
Installing stock 4X4 exhaust: CB500-CB550 K: http://forums.sohc4.net/index.php?topic=82323.0
CB550 Assembly Manual: http://forums.sohc4.net/index.php/topic,151576.0.html

Offline dave500

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Re: Caliper animation
« Reply #6 on: October 10, 2013, 01:45:32 am »
do one of your broken foot,get better soon!

Offline 75CBCafe

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Re: Caliper animation
« Reply #7 on: October 10, 2013, 03:33:20 am »
I never realized that the seal acted as a return spring. Yes, very nicely done

Offline bwaller

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Re: Caliper animation
« Reply #8 on: October 10, 2013, 03:45:21 am »
do one of your broken foot,get better soon!

Dave, you're a riot man!

I hope your foot heals quickly, are you wearing a "boot"?

Offline evanphi

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Re: Caliper animation
« Reply #9 on: October 10, 2013, 04:55:37 am »
Nicely done!
--Evan

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Offline Stev-o

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Re: Caliper animation
« Reply #10 on: October 10, 2013, 05:26:38 am »
At first, thought maybe you cut the caliper n half with your bandsaw (like the plug cap), this is much better.

Guessing the accident may be a bit embarrassing since you don't want to give details!
'74 "Big Bang" Honda 750K [836].....'71 Honda 750K project.....'76 Honda 550F.....K3 Park Racer.....K5 Fiddy Dolla Special!......and a Bomber!............plus plus plus.........

Offline Bob Wessner

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Re: Caliper animation
« Reply #11 on: October 10, 2013, 06:24:26 am »
Nicely Done!

+1

Out of curiosity, what software did you use?
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Offline 754

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Re: Caliper animation
« Reply #12 on: October 10, 2013, 06:35:26 am »
Nice, if that wont explain it, they will never get it.
 Can you get the rotor to turn slowly, or slow to a stop ?
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Offline flybox1

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Re: Caliper animation
« Reply #13 on: October 10, 2013, 07:24:51 am »
well played.  needs to go in the Brake FAQ section for sure.
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

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Offline Powderman

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Re: Caliper animation
« Reply #14 on: October 10, 2013, 08:14:00 am »
I never realized that the seal acted as a return spring. Yes, very nicely done
When I ran the caliper department at Rebco Racing Enterprises I built all the calipers with a square o-ring seal. When the racers complained about brake drag when the brakes got hot I would rebuild them caliper using round o-ring seals. The round seal allowed for more retraction of the piston eliminating the hot drag condition.The seal is the only thing that retracts the piston.

Offline TwoTired

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Re: Caliper animation
« Reply #15 on: October 10, 2013, 09:09:42 am »
I never realized that the seal acted as a return spring. Yes, very nicely done
The seal is the only thing that retracts the piston.

The seal only does half the job of retraction.  The other half of the job is the caliper arm spring around the adjustment bolt and incidental contact of the rotor to the piston side brake pad.

I don't see how a round seal would work at all for retraction, unless it was deformed enough to form a square section.  Perhaps if a different material was used...
Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline 754

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Re: Caliper animation
« Reply #16 on: October 10, 2013, 09:12:45 am »
Dont think of it as a round seal, think more like double D shape.like a steering shaft in a car. Ie a shaft with a flat on 2 sides is an example
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline brewsky

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Re: Caliper animation
« Reply #17 on: October 10, 2013, 10:52:33 am »
Great job!
How about adding a little vibration and a loud screeching soundtrack to make it even more realistic?
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Offline SohRon

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Re: Caliper animation
« Reply #18 on: October 10, 2013, 11:22:19 am »
Thanks for the comments, guys, and for the sympathy for the foot. I'll try to answer your questions all at once.

Stev-o, you must have missed the part where I mentioned a "sectioned" caliper, which means I cut it apart - actually a couple of years ago, now. The bleeder screw was frozen solid and nothing I (or the guys down at the shop) did could free it. The shop crew offered to mill it out for me. but I decided (the caliper being from a "Box-O-Bolts auction on ebay - $25 for a box of parts) I'd just as well see how it ticks and so I hit the band saw. After all, my motto is: "If You Have Access To A Band Saw - Use It!"

As for the foot... Let's just say it involved a rock, a fire, and possibly just a smidge too much "Jackie Dee" and leave it at that...

Here's the original raw footage, so to speak:









I processed the scans and created the artwork in Photoshop, then exported them into Adobe's "Image Ready" to create the animation and .MOV files, then converted that to .GIF in AVS Video Converter. The rather poor video in the GIF is due to its limit of 256 colors. Here's a better version on Youtube:

CB Caliper

And theres a link at the bottom of this post you can use to save a version for your very own, if you're so inclined...

I thought about rotating the disc and showing the return spring... maybe I'll get to that in another version. I'm actually working on an essay covering the brakes; this is just kind of a test to see how the process works. Next up will be the Master Cylinder.

Now, where is that band saw?
« Last Edit: October 10, 2013, 11:31:50 am by SohRon »
"He slipped back down the alley with some roly-poly little bat-faced girl..."

Assembling my '74 CB550: http://forums.sohc4.net/index.php?topic=86697.0
Assembly of the Right-hand Switch (a rebuilder's guide):  http://forums.sohc4.net/index.php?topic=80532.0
Installing stock 4X4 exhaust: CB500-CB550 K: http://forums.sohc4.net/index.php?topic=82323.0
CB550 Assembly Manual: http://forums.sohc4.net/index.php/topic,151576.0.html

Offline flybox1

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Re: Caliper animation
« Reply #19 on: October 10, 2013, 11:39:41 am »
anyone notice during a cleaning that the o-ring groove is not square  ;)  cross section clearly shows it.
how about a nice closeup gif of the piston to piston o-ring interface, so all can see how it 'rolls up on edge' because of the off-square groove it sits in. 
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

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1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
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Offline brewsky

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Re: Caliper animation
« Reply #20 on: October 10, 2013, 11:46:52 am »
anyone notice during a cleaning that the o-ring groove is not square  ;)  cross section clearly shows it.
how about a nice closeup gif of the piston to piston o-ring interface, so all can see how it 'rolls up on edge' because of the off-square groove it sits in. 
+1...........you beat me to it....I thought I was not able to get the corners completely cleaned out!
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Offline mono

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Re: Caliper animation
« Reply #21 on: October 10, 2013, 11:46:58 am »
Well done!  seriously impressive :)

Offline flybox1

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Re: Caliper animation
« Reply #22 on: October 10, 2013, 11:53:47 am »
anyone notice during a cleaning that the o-ring groove is not square  ;)  cross section clearly shows it.
how about a nice closeup gif of the piston to piston o-ring interface, so all can see how it 'rolls up on edge' because of the off-square groove it sits in. 
+1...........you beat me to it....I thought I was not able to get the corners completely cleaned out!
Yes. at rest, piston-facing side of the seal sits flush with the piston, with enough pressure to prevent leaks(good condition piston assumed), but when fluid pressure increases behind the piston and it moves, only the posterior edge of the seal rides/rolls up on the edge on the piston, increasing the pressure in the groove and tightening the seal.
good stuff.
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline Bob Wessner

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Re: Caliper animation
« Reply #23 on: October 10, 2013, 11:58:55 am »
A copy of the animation has been posted to the Brake thread within the FAQ's. Thanks, SohRon.
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Offline Deltarider

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Re: Caliper animation
« Reply #24 on: October 10, 2013, 12:00:59 pm »
Quote
yeah bloody beautifull,now do a 550 transmission please.
;D ;D ;D
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