all most got squashed by my table March 17 2004 at 9:44 PM
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i was propping up the table on one side as i was fixing the concrete blocks (bad idea) i was all the way under the table,,, when steel poles i was propping it un with stared to give....i mad it out just in time with only a few bumps.......dont put a table togeather with out a friend's help... and don't be as dumb as me
read this one...spell check did check all of the last post
March 17 2004, 10:04 PM
i was propping up the table on one side as i was fixing the concrete blocks (bad idea) i was all the way under the table,,, when steel poles i was propping it up with started to give....i made it out just in time with only a few bumps.......dont put a table togeather with out a friend's help... and don't be as dumb as me
Danny, apply the same technique as needing to jack up a car and work underneath it. After you jack up a corner of your table and it is setting on those poles, use some concrete blocks to build a rigid temporary leg. This way the end of the table can never fall on you. Glad you are OK.
In my sand table days in the late 80's I built an 8'x 6' x 15" sand table with layers of blocks, plywood and inner tubes. The innter tubes were sandwiched between two layers of ply and the table itself was sitting on the upper layer of ply. There were 6 inner tubes arranged asymmetrically (a point I've not seen addressed here so far, but important. You don't want to set up harmonic modes.) Anyway, one of them started leaking. Unfortunately, all the nozzles or whatever you call 'em were on the inside. oops. I spent an entire afternoon shovelling over 100,000 cubic inhes of sand and dismantling the entire thing to get to one nozzle. Luckily I had a more mechanically oriented friend who inter-connected all the inner tube nozzles with platic piping and then had one arm of this plastic piping system sticking outside the table and blocked off as a 'inflating pipe'. The next time I had a leak I simply had to connect the 'inflating pipe' to a bicycle pump.
Same sort of thing with me. I removed the valve cores and epoxied plastic tubing to the valves, added replacement valves at the other end.
It's really easy to alter the level of my table. More details here... http://www.dragonseye.com/holography/2004_02.html#tubes
John, good call! Even if you have a table that is already built you can make the holes you need if plywood is on bottom. I have even replaced tubes that were on a table that did not oringinally have holes.
