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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Tue Sep 25, 2007 3:06 pm Post subject: Question re the Chief motorized lifts... |
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I have a customer that wants to put in a motorized mount to get rid of the projector when not in use. I know Draper scissor lifts are hellishly expensive, but has anyone used the Chief mounts that use aircraft cable?
I've had two here (long since sold), and I know they are more made for servicing of a unit, to lower the projector to the floor from a ceiling, but can it also be used to suspend a projector in mid air, and does it have a lowered stop sensor so I can set it to stop say at 3' below the full up position?
Just curious...
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Tue Sep 25, 2007 4:35 pm Post subject: |
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Hello
There is no stability, it would sway in mid air.........
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Clarence
Joined: 08 Mar 2006
Posts: 3827
Location: Smith Mtn Lake, VA
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| Posted: Tue Sep 25, 2007 4:51 pm Post subject: |
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| Tim in Phoenix wrote: | | Hello |
OK, who are you and what did you do with Tim? 
What happened to your iconic "Guys!" greeting?! 
I agree... I've lifted a Marquee with a Chief powered cable lift, and Cliff recently sent me one to use with my G90, but I would never leave it dangling on the cables... much less lift it up and down on a daily basis.
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Tue Sep 25, 2007 5:21 pm Post subject: |
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That's what I figured, thanks!
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Wed Sep 26, 2007 12:01 am Post subject: |
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I've been kicking around an idea that would answer this question, with sufficient ceiling height...
Imagine a cubic rectangle made out of 8020 or even Unistrut... Suspended within the rectangle would be a frame that overlaps the bottom plane of the cubic rectangle such that the frame could come to a full stop on the inside (top) surface of the bottom plane...
What you would have is a PJ platform that could be lowered by cable and have a very repeatable Z height.In order to control the X and Y position (and angle) you could have two cone- or ball-and socket interfaces on opposite corners between the 8020 frame and the PJ platform. When the PJ descends to a stop the ball- or cone-and socket interfaces would pull the PJ into a highly repeatable square-to-the-screen position.
That clear as mud? I could try to draw it up if anybody is interested, but time is a bit of a problem lately.
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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| Posted: Wed Sep 26, 2007 2:23 am Post subject: |
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| Clarence wrote: | | Tim in Phoenix wrote: | | Hello |
OK, who are you and what did you do with Tim?
What happened to your iconic "Guys!" greeting?!
I agree... I've lifted a Marquee with a Chief powered cable lift, and Cliff recently sent me one to use with my G90, but I would never leave it dangling on the cables... much less lift it up and down on a daily basis. |
Instructions state the projector must be locked in position and not left suspended by the cable alone . I suspect there could be some slipping in the motor or gears ? Plus with only two cables you most likely will have a balance problem. 
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Clarence
Joined: 08 Mar 2006
Posts: 3827
Location: Smith Mtn Lake, VA
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| Posted: Wed Sep 26, 2007 2:30 am Post subject: |
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| Tom.W wrote: | | Instructions state the projector must be locked in position and not left suspended by the cable alone |
Instructions?! 
Wrong forum. 
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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| Posted: Wed Sep 26, 2007 3:30 am Post subject: |
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One button is easier on the back !
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Wed Sep 26, 2007 2:08 pm Post subject: |
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I have been thinking diy motor mount when I was hoping to move to house that have attic. It would be cool to have flat ceiling where projector can be lowered down...
This kind simple mount have very accurate positioning (two cone pins) when projector is lowered down using what ever winch. But it need lot of room over ceiling. 
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Wed Sep 26, 2007 2:50 pm Post subject: |
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That's pretty much what I had in mind!
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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aspec2
Joined: 10 Apr 2006
Posts: 549
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| Posted: Wed Sep 26, 2007 6:11 pm Post subject: |
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I like the design except
1. It needs 2 (not 1) locating pins made with percision.
2. It needs an "up" locking device so that it is not supported by the cable.
Also, I see many many people with 4 point mounts. It is much easier to level anything with 3 points.
Walt
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Wed Sep 26, 2007 8:22 pm Post subject: |
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| aspec2 wrote: | I like the design except
1. It needs 2 (not 1) locating pins made with percision.
2. It needs an "up" locking device so that it is not supported by the cable.
Also, I see many many people with 4 point mounts. It is much easier to level anything with 3 points.
Walt |
I agree with both points, but the need for precision can be lessened by making a ball-and-cone interface (so that the tangential interface of the ball and its' mating cone will make a highly repeatable stop regardless of the relative imprecision of the machined parts used in this interface.)
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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Bighitter
Joined: 15 Dec 2006
Posts: 159
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| Posted: Sun Sep 30, 2007 9:14 pm Post subject: |
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I may have a SVS lift I can pull out of a customers place soon. He doesn't need it anymore as he no longer has the Vision One being lowered from it and since he has a much smaller projector he wants to keep it stationary so the noise isn't a problem anymore.
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Clarence
Joined: 08 Mar 2006
Posts: 3827
Location: Smith Mtn Lake, VA
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| Posted: Sun Sep 30, 2007 11:57 pm Post subject: |
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| aspec2 wrote: | I like the design except
2. It needs an "up" locking device so that it is not supported by the cable. |
I'd envisioned the lower blue frame as being fixed to the ceiling joists, or a support frame above the joists if the projector is completely hoisted into the ceiling.... adequately supported with joist hangers, lag bolts, etc.
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