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#1 Jens Piotrowski SOC

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Posted 25 April 2010 - 02:43 PM

It's usually the CRT monitor that's starting to vibrate and then these vibrations are transmitted into the sled. I have tried several brackets, PRO, XCS, Sachtler. Has anybody ever tried to mount the monitor (TB6/PRO) on 2 points instead of 1, maybe with a support rod or similar to the bottom of the monitor housing? Just wondering....

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#2 Iain Baird

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Posted 25 April 2010 - 03:56 PM

It's usually the CRT monitor that's starting to vibrate and then these vibrations are transmitted into the sled. I have tried several brackets, PRO, XCS, Sachtler. Has anybody ever tried to mount the monitor (TB6/PRO) on 2 points instead of 1, maybe with a support rod or similar to the bottom of the monitor housing? Just wondering....

Jens



Jens,

I have the same issue, on low mode shots it seems to be magnified, but it certainly becomes an issue either way with long lens and running work. Presently I'm using thin sailing rope (the stuff that doesn't stretch) as a stiffener. My monitor bracket has attachment points for the Tiffen super post stiffening system, I attach to these and wrap the line around my post and tighten. It makes it 99 percent better. I'm in the process of having Walter Klassen build me some brackets that I'll use for the batteries as I've noticed some vibrations there as well.

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#3 Jens Piotrowski SOC

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Posted 25 April 2010 - 04:55 PM

It's usually the CRT monitor that's starting to vibrate and then these vibrations are transmitted into the sled. I have tried several brackets, PRO, XCS, Sachtler. Has anybody ever tried to mount the monitor (TB6/PRO) on 2 points instead of 1, maybe with a support rod or similar to the bottom of the monitor housing? Just wondering....

Jens



Jens,

I have the same issue, on low mode shots it seems to be magnified, but it certainly becomes an issue either way with long lens and running work. Presently I'm using thin sailing rope (the stuff that doesn't stretch) as a stiffener. My monitor bracket has attachment points for the Tiffen super post stiffening system, I attach to these and wrap the line around my post and tighten. It makes it 99 percent better. I'm in the process of having Walter Klassen build me some brackets that I'll use for the batteries as I've noticed some vibrations there as well.

IAIN



interesting, can you post some pictures of your monitor setup with rope attached?

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#4 Eric Fletcher S.O.C.

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Posted 25 April 2010 - 04:55 PM

It's usually the CRT monitor that's starting to vibrate and then these vibrations are transmitted into the sled. I have tried several brackets, PRO, XCS, Sachtler. Has anybody ever tried to mount the monitor (TB6/PRO) on 2 points instead of 1, maybe with a support rod or similar to the bottom of the monitor housing? Just wondering....

Jens



Sorry, But I've never had monitor vibration issues. What center post are you using, that could be the source of your issues
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#5 Jens Piotrowski SOC

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Posted 25 April 2010 - 05:05 PM

Hi Eric, it's not that I'm having real problems with vibrations, I'm just trying to optimize something. Engineering wise it does not make sense, to hang the 5 lbs on just point that far out. Can you do me the favor and tap against the most outer point on your TB-6, probably the bottom corner, do you feel any vibrations arriving on your topstage? BTW, it's a PROII centerpost....
I'm fully aware that the XCS 2" carbon-fiber post is around 15x stiffer.....
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#6 Eric Fletcher S.O.C.

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Posted 25 April 2010 - 05:22 PM

Hi Eric, it's not that I'm having real problems with vibrations, I'm just trying to optimize something. Engineering wise it does not make sense, to hang the 5 lbs on just point that far out. Can you do me the favor and tap against the most outer point on your TB-6, probably the bottom corner, do you feel any vibrations arriving on your topstage? BTW, it's a PROII centerpost....
I'm fully aware that the XCS 2" carbon-fiber post is around 15x stiffer.....



No vibrations whatsoever. That's one of the reasons I bought a XCS Ultimate
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#7 Brant S. Fagan SOC

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Posted 25 April 2010 - 05:28 PM

Gents--

Have you checked your battery attachment plates for slop? Good place to look for a source of movement and therefore vibration.
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#8 Eric Fletcher S.O.C.

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Posted 25 April 2010 - 05:30 PM

Gents--

Have you checked your battery attachment plates for slop? Good place to look for a source of movement and therefore vibration.



Anton Bauer Gold Mounts are notorious for slop, a little soft velcro helps to kill it
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#9 Iain Baird

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Posted 25 April 2010 - 06:03 PM

In my case it has absolutely nothing to do with the post or battery plates, it's exactly as Jens pointed out - 5lbs of weight extended out. Perhaps some monitor mounts are more ridged than others but having solved the problem with the guide wires I can attest to the source of my issue.

And as Jens pointed out, it's not a big issue, in fact I never notice it on most shots but when you're on a 100mm any small vibration problem becomes magnified.
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#10 RonBaldwin

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Posted 25 April 2010 - 06:25 PM

I haven't noticed the vibrations making to the camera (yet) with the pro2, but I have also considered some sort of 2nd mounting point to reduce that wicked little shimmy. The sachtler bracket seems more solid than the newer xcs one. The few times I've used an xcs rig I could see the monitor vibrating way more than I was used to, but the post absorbed it and it never made it to the camera so many kudos to Greg as usual. Greg's older monitor bracket is WAY more solid. I was thinking of getting a pro monitor bracket with an extension block (Hill's 1.5", not the GPI 3.5"), that would be pretty solid but not as flexible.

In case you don't already have one...Tom Gleason's tb-6 stabilization plate helps quite a bit, the housing on the bottom of the monitor is thin. It also would give you somewhere to tap a few holes to attach said monitor stabilization chingus. I was going to try going from a treaded hole in Tom's plate to the pro plate I have on fracol's "foot":

Attached File  IMG_5803.jpg   64.93KB   141 downloads

rb
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#11 Jens Piotrowski SOC

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Posted 25 April 2010 - 06:38 PM

I haven't noticed the vibrations making to the camera (yet) with the pro2, but I have also considered some sort of 2nd mounting point to reduce that wicked little shimmy. The sachtler bracket seems more solid than the newer xcs one. The few times I've used an xcs rig I could see the monitor vibrating way more than I was used to, but the post absorbed it and it never made it to the camera so many kudos to Greg as usual. Greg's older monitor bracket is WAY more solid. I was thinking of getting a pro monitor bracket with an extension block (Hill's 1.5", not the GPI 3.5"), that would be pretty solid but not as flexible.

In case you don't already have one...Tom Gleason's tb-6 stabilization plate helps quite a bit, the housing on the bottom of the monitor is thin. It also would give you somewhere to tap a few holes to attach said monitor stabilization chingus. I was going to try going from a treaded hole in Tom's plate to the pro plate I have on fracol's "foot":

Attached File  IMG_5803.jpg   64.93KB   141 downloads

rb


i had a similar idea going from the tb-6 plate to the old style PRO gyro mount plate at the forward battery....
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#12 RobVanGelder

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Posted 25 April 2010 - 10:55 PM

I was shooting yesterday with an EX-3 and P&STechnik adapter and Superspeed, and noticed a vibration in the part of the shot when I was running.
I tighten all things that I can find ( and there were a few) but it did not improve.
Battery plates, (Anton Bauer), HD-recorder (on V-lock), even with all firmly taped the same vibration appeared while running.
Then I noticed the support from the P&S adapter: this has a small aluminium plate, filled with mounting holes and this is exactly where it goes wrong. Combined with the plastic Sony body, this is never going to be a 100% flex free construction. I had to put to wedges in between the sliding baseplate (Arri style) and the support of this adapter. Only then the vibration disappeared.

Very silly construction from P&S, I think.

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#13 Eric Fletcher S.O.C.

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Posted 25 April 2010 - 11:31 PM

Jens,

One of the things you might try is moving the monitor clamp up the post 1 or 2 inches. That way you are changing the tuning of the post and using the battery rack as a mass damper
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#14 Jens Piotrowski SOC

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Posted 26 April 2010 - 10:23 AM

Jens,

One of the things you might try is moving the monitor clamp up the post 1 or 2 inches. That way you are changing the tuning of the post and using the battery rack as a mass damper



made some use of my sachtler bracket today, which i normally use for my Blackbird monitor.

this seems to be a much stiffer setup, the bracket is mounted to the post and rests on the lower junction box. side-effect: monitor sits about 2" lower than with the standard pro bracket...

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