stars_in_my_eyes
sage
Reged: 03/24/08
Posts: 383
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I would like to build a bino chair that will hold and support the binoculars while allowing minimum vibration to be transmitted to the binoculars from the user.
Any suggestions?
Thanks
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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 12345
Loc: Cumberland, R I , USA42N71.4W
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See the link thru the Best Of - Mounts to the thread on "binocular chairs", the most comprehensive collection of links to chair mounts to be found anywhere on the internet.
My guess is that will lead you to over 100 links to chair mounts.
edz
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Teach a kid something today. The feeling you'll get is one of life's greatest rewards.
member#21
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stars_in_my_eyes
sage
Reged: 03/24/08
Posts: 383
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I have...and there is little mention in what efforts were successful in minimizing vibration.
That is why I am asking the question in hopes to have a discussion on this particular design issue.
Thanks
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rnabholz
scholastic sledgehammer
Reged: 07/25/04
Posts: 764
Loc: Iowa
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A couple of thoughts resulting from the experiences with my chair.
There were two vibrations types that I encountered. The first was vibration from movement of the chair and movement of the observer. For the most part those are pretty easily controlled using a couple of strategies. If the intention is to "slew" the chair while observing, slow and steady movements have proven to produce vibration free views. The lazy susan bearing moves very freely and so azimuth slews are quite smooth.
The other interesting discovery was that the position of the obvserver made a big difference in the vibrations encountered. When seated on my chair, because of the relative low height of the seat, I found that when i planted my feet flat on the ground, knees bent, I was experiencing vibrations from what I believe are the tiny involuntary tremors of my leg muscles. When I extended my legs straight out in front of me, with only my heels making contact with the ground, the view improved tremendously.
So you can do quite a lot of good by adapting the way you use the chair to minimize vibrations.
The second source of vibration is from the observer's heart beat. At times, I could detect a small tremor coincident with my heart beat. It was not consistent, and often after I had been sitting a while it disappeared, I suspect because being at rest meant that my heart was not pumping as hard as it was while I was setting up and just starting to observe.
I did find that a couple of things addressed this to a great extent. Setting up on grass vs concrete or other hard surface had a positive effect. The other was the addition of cushions to the seat which I suspect acted as a damping mechanism to prevent the transmission of the vibration from the chair to the parallelogram and binos.
It might be a worthwhile exercise to add something to the feet of the chair to add some vibration damping as well - maybe hockey pucks.
It is a great way to observe and the vibrations are easily managed.
Good luck with your project,
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Rod Nabholz
Home Built Astronomy Projects
Wild Bird Photography
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Wes James
Carpal Tunnel
Reged: 04/12/06
Posts: 2364
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One of the things that cut down on vibration/increased the smoothness/stability of my chair was to add chair/table sliders outboard of the 12" lazy susan bearing I used for the platform. Placing sliders the same thickness as the bearing as far out from the center as I could kept everything much smoother and more stable. I never really encountered any vibration problems that I noted.
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Wes
Atlantic Beach, FL
Some bino’s from Miyauchi 5x32 Binon's up through Garrett 20x110 Signature's,
Some telescopes from a Stellarvue 80mm NHNG up through a couple of 8” reflectors…
And a wonderful 4.25" Delmarva Shiefspiegler!
Some good friends, made here on C/N.
Oh- several cats and a wonderful wife!
Anyone want a cat???? :-O
"When your work speaks for itself- Don't Interrupt" -Gamble Rogers
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devond
super member
Reged: 08/21/06
Posts: 120
Loc: Northern CA, USA
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My low-tech solution was to mount an Orion Paragon Plus P-Mount on a $20 Lowes steel sawhorse. The sawhorse is attached to two boards with wheels on the end. This allows the "saw-mount" to be moved while seated and thereby avoids any connection between the chair and the binos. Granted you now have to rotate the chair AND maneuver the mount but it's not that bad. And since I had the P-Gram on hand it's hard to beat the price.
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Clear skies,
-DevonD
Bincos: 7x35,10x25,11x56,15x50,15x70,25x100
Scopes: AT66, ST80, 90mm Apex Mak, 100mm Skyview, 8" C8
EPs: Hyps(5,8,21),Pans(22,35),Nagl(3-6),Pentax 10 XW, Orion 3.7 ED-2,Vixen 15 LV, Misc Junk
Mounts: CG-5GT, Orion XHD+PGram, Bogen 501 HDV
Toys: Power-X-Switch S2, BV3 Binoviewer
Money: zilch
---sleep deprivation indicator---
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stars_in_my_eyes
sage
Reged: 03/24/08
Posts: 383
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Thanks for the discussion so far.
I have already learned details I did not anticipate.
I look forward to more discussion.
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Denis
sage
Reged: 12/24/05
Posts: 204
Loc: Rennes, France
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Here are the result of differents attempts.
With the final version, observing at 20x is a pleasure, 30x need to be very steady on the chair and heartbeats become sensitive. I try 40x with a sc 4" and I considere it unsuseable or at least very difficult to use on this chair.
http://www.reto.fr/jumelles/index.html
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Canon 10x42 IS binoculars.
Meade sc 4" on homemade fork equatorial mount.
homemade 10" an 14" dobsonian
Nikon photogear.
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stars_in_my_eyes
sage
Reged: 03/24/08
Posts: 383
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Thanks for the input.
Since I am considering higher powers (thinking about 30x), your information is important.
Anyone else?
This has got to be a very important issue with bino chairs.
And since I am considering the "bino cube" approach where the binos are linked to the bino chair, dealing with this issue up front is important.
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stars_in_my_eyes
sage
Reged: 03/24/08
Posts: 383
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Quote:
http://www.reto.fr/jumelles/index.html
Excerllent web page...thanks for posting.
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later
sage
Reged: 01/16/05
Posts: 445
Loc: Posen, Michigan
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I have been reading quite a bit about Sorbothane. The shock absorption qualitys of this polymer is far superior than anything else on earth. It turns vibration energy into an almost imperceptable amount of heat.
It is important that the shape of the Sorbothane is correct for proper dampning.
It is being used in turntable platters and mounts for cameras in race cars. Also some insoles have this materiel in it.
This "might" be the magic material we have been looking for??
Sorbothane
(I have no connections with Sorbothane!!!)
Gary
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Galileo 15 X 70
Oberwerk BT100-45
Televue 8-24mm EP's
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KennyJ
Reged: 04/27/03
Posts: 10031
Loc: Lancashire UK
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Due to three weeks of taking exams , I'm playing catch - up with some of these threads .
My word , there have already been some VERY enlightening posts in THIS thread !
Thanks to EVERYONE who has contributed thus far !
Clear skies
Kenny
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Two eyes and a preference to use both
Zeiss 7 x 42 BGAT
Captain's Helmsman 7 x 50
Nikon 10 x 42 Superior E
Swift Audubon Kestrel 10 x 50
Helios 15 x 70 Observation
Strathspey 20 x 90
Televue 76 APO
Zeiss 85 Diascope
Helios 102 f5 refractor
Various eyepieces barlows tripods mounts etc.
Panasonic Lumix DMC - TZ5 digital camera
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Dennis_Oz
sage
Reged: 08/20/06
Posts: 214
Loc: Brisbane, Australia
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Just for information, I have used the Celestron Vibration Suppression pads for my ‘scope tripod, and I found that the effect of the sorbothane puck was to reduce the dampening time from around 6 secs to less than 1 sec, although the amplitude of the initial displacement remained the same.
Cheers
Dennis
Quote:
I have been reading quite a bit about Sorbothane. The shock absorption qualitys of this polymer is far superior than anything else on earth. It turns vibration energy into an almost imperceptable amount of heat.
It is important that the shape of the Sorbothane is correct for proper dampning.
It is being used in turntable platters and mounts for cameras in race cars. Also some insoles have this materiel in it.
This "might" be the magic material we have been looking for??
Sorbothane
(I have no connections with Sorbothane!!!)
Gary
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