So I have been "given" a project that requires scanning of warehouses of about 250,000 SF and Active production and processing lines totaling about 210,000 SF. All the data has to be certified to 1/4"?ÿ
Curious if anyone here has dealt with these tolerances in an industrial setting? As for me, I can see the gray hair falling out already
N10,000, E7,000, Z100.00
PLS - IL, MO, AR, KS, MN, KY
Living the dream ??ÿ
That has been a standard when prefab metal structures and the bolt patterns are located or staked.
They expect that when design wants to connect to existing sturctures.
Nightmare - Best part....The contract has been signed, without a site visit, or my input.?ÿ
N10,000, E7,000, Z100.00
PLS - IL, MO, AR, KS, MN, KY
Nightmare - Best part....The contract has been signed, without a site visit, or my input.?ÿ
Who signed the contract??ÿ
My boss(es) signed the contract. I told them it would probably cost three times the contract amount.?ÿ
N10,000, E7,000, Z100.00
PLS - IL, MO, AR, KS, MN, KY
Yippee!! ?ÿI love my job...I love my job...I love my job...
My boss(es) signed the contract. I told them it would probably cost three times the contract amount.?ÿ
Well since you are an employee just do your best and if the "bosses" bid the contract to low it's their problem not yours. Bosses can be really stupid sometimes. (I know, believe me)?ÿ ??ÿ
Yippee!! ?ÿI love my job...I love my job...I love my job...
Bradley, yer on the wrong post son, go to Wendells post about the rapist.?ÿ ??ÿ
I wouldn't be too worried. How are they going to check it to those stamdards. Construction Craftsmen make things fit. It's what they get paid the big bucks to do. The designers want a 10 year old to cut it out and it all fits perfect.
Do they expect every point in the point cloud to be within 1/4"? Good luck extracting all the noise to get to those specs.
They expect every item that touches the floor to be surveyed and modeled to within 1/4" so that an autonomous system can be designed that would allow robotic fork trucks to move raw material and finished product about the plant and into the multi level warehouses.?ÿ
N10,000, E7,000, Z100.00
PLS - IL, MO, AR, KS, MN, KY
"our lady of assumption"
?ÿ
liking this entire thread.
[Rant on]
Nothing bothers me more than cr@p like 0.02' tolerances.?ÿ That's like saying all the measurements have to within "blue".
The first thing anyone learns in any college class that involves measurements in the physical sciences is that all measurements have error, therefore a measurement (or a measurement tolerance) consists of three parts - the number, the precision range, and the repeatability.?ÿ If an objects?ÿ"true" value is 1000, then a measurement of 950 +/- 60?ÿ is "correct" and a measurement of 990 +/-2 is "incorrect".?ÿ
[Rant off]
Just certify that 66% of the measurements are within 0.02 +/- .05; now you've got a tenth to play with?ÿ?ÿ ??ÿ
It's as bad as FEMA citing BFE's to .1 feet. No understanding of significant figures, estimates of uncertainty, or precision. But CAD will give you an answer to however many places you think you want.
People often don't realize the difference between a series of measurements along a line, each to X tolerance versus holding X tolerance over the whole length.
We've typically broke out the old non electronic angle turner and steel tape to lay out machinery to lay out that tolerance.?ÿ
I know a lot of clients we have done it for have always asked for a tolerance that expands with tempature....which is something we cannot do right now. We've always been able to work them back to 1/2". Sadly, looks you are past that point (not your fault).?ÿ
I can think of a lot of machinery like a printing press. To lay it out to those impossibly tight tolerances and for the machine to actually run properly, the area/pad was actually tempature controlled to control expansion.
So did you use a tape in order to duplicate the expansion of the works due to temperature? I have heard of folks doing that in some cases but never really wrapped my head around it. If I follow you read the tape and do not correct for temp when working and the concrete or metal features are expected to expand and contract to the read distance when the temp stabilizes?
The context I have heard of doing that in is concrete slab and form work for large works.
In theory that works, but only if the fabrication shop is at the same temperature as the site! I saw it done with a load of large glazed frames - site temperature at the time the manufacturer measured was -2C, his factory was at +20C. The resultant frames were very, very tight in the spaces they were supposed to fit into.