#1
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how to level a 8x15' fixture/surface plate?
I am in the process of building a fixture/surface plate.It is getting blanchard ground and the sides cut and squared.I am going to build a table for it to sit on when it gets delivered to my shop.What have you guys done in the past to level it out.My plan is to bolt it down to my table and it will most likely need to be shimmed between table and plate and then obvioulsy leveled with feet.But with a table beind 15' long and 8 feet wide and being ground i want to be as accurate as possible.Any suggestions appreciated.
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Kyle |
#2
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How thick is the plate?
What sort of tolerance are you hoping for? A steel plate that size is going to move around and change every day I would think. A twenty degree temp change over fifteen feet will shrink or expand 1/4".
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Richard K |
#3
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Richard,
I think you might be off by a decimal place. A 20 degree F change will only expand or shrink 0.023" over 15 feet. The metal (steel) will expand (or contract) by 0.0000065 inches per inch per degree.
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Jeff Newton |
#4
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I stand corrected
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Richard K |
#5
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Quote:
What are you some kind of a Rocket Sceintist or something
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Dan Pate |
#6
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I use a .0005" per 6" level to set up my lathe, with climate change in the winter- summer etc the concrete moves and throws it way off. What you making that you need such precision? At school we have a table that floats on air to keep it "perfect"
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Ben |
#7
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Or something.... for sure. Thanks Dan.
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Jeff Newton |
#8
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Surveyors transit.,
You can be as accurate as the cross hair line thickness is viewed over the story pole line. Good for leaving set up in a corner and checking chassis as parts are installed . I spent years building swimming pools using a transit none had any water running out one end. True level is when those fountains have water running off all sides in a sheet at the same time. |
#9
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I will ask the same question asked by Richard, How thick is the surface plate. When I set up pool tables I use good quality playing cards for shims and the support base is wood. Temperature and humidity will cause movement as stated above. I use a precision machinist level, .0005" per foot.
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Joe Hartson There is more than one way to go to town and they are all correct. |
#10
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I have a 6' x12' table that's covered with a sheet of 1/2" 6061. There are 18 pads under the aluminum plate. In the center of each pad there is a 1/2-13 threaded hole. The top is bolted down with flat head screws. On either side of each 1/2" bolt there are 3/8 16 jack screws. First I leveled the table frame then leveled the top with a .0005"/foot precision level.
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