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Old 02-09-2018, 03:48 PM
Nutcase Nutcase is offline
 
Join Date: Jan 2010
Location: Vernonia, OR
Posts: 12
Default Floating bridge

Recently, as I was sitting at my desk, it occurred to me that I was on top of a reasonably sturdy and stable platform that pivots easily and has an adjustable height. Used office chairs are cheap and plentiful...

So I took the seat off a chair and attached a 33" long plywood-and-2x4 beam in its place. The chair base is from a stool with a conveniently large range of height adjustment. The seat attachment platform isn't level, so I attached the box with a hinge on the high end and put in a sturdy spacer to prop up the low end. The beam's center of gravity is positioned so that it can pivot from stable horizontal to stable vertical. I attached a bridge to the beam.

So far so good. The top of the beam is itself a minimalistic table. The whole contraption, what I am calling a "floating bridge," is easy to move and easy to store.

I then clamped a 6' 2x10 plank (salvage from an old water bed frame) in Rigid's version of a jawhorse. There are lots of ways to prop up a plank, and I'll want to free up the jawhorse eventually, but this is just about ideal at the proof-of-concept stage. I rolled the floating bridge into place and raised it so that the beam made contact with the bottom of the plank.

The plank supports dimensional lumber very well, and the floating bridge allows for cuts at angles that are too acute for a miter saw.The whole setup also breaks down as easily as it goes up. However, as is, it's more than a bit wiggly, the casters limit small adjustments and the cut line is off to the side from the axis of rotation; in sum, setting up cuts isn't always easy.

So I drilled a 1/4" hole through the top of the beam in line with the chair base's axis of rotation, and through the plank. I then used the 1/4" pin from a door hinge to connect the two. The cut line is still off the axis, but the fact that axis is fixed already makes lining up a cut much easier.

There is still a lot to improve with this setup, but it's already usable.
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Old 02-09-2018, 03:59 PM
kenk kenk is offline
 
Join Date: Feb 2012
Posts: 253
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Quote:
Originally Posted by Nutcase View Post
Recently, as I was sitting at my desk, it occurred to me that I was on top of a reasonably sturdy and stable platform that pivots easily and has an adjustable height. Used office chairs are cheap and plentiful...

So I took the seat off a chair and attached a 33" long plywood-and-2x4 beam in its place. ...
I'm so glad you didn't sit on my beloved La-Z-Boy!! Heh
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Old 02-10-2018, 09:15 AM
Nutcase Nutcase is offline
 
Join Date: Jan 2010
Location: Vernonia, OR
Posts: 12
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Originally Posted by kenk View Post
I'm so glad you didn't sit on my beloved La-Z-Boy!! Heh
It's not so easy to repurpose a La-Z-Boy. At least, that's what my wife says.
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