Objects keep moving, any suggestions?

I used to set precision to 3 decimal places which is in millimeters in my case. That is enough for the building industry. Recently, I found out a coworker worked on my drawing while I was on vacation. Something seem out of place, so I set the precision to 8 decimal places and noticed everything is off by a bit. In general, 0.00000002 isn't going to affect the project, but it just bugs me a lot. I spent hours lining everything up perfectly, just to find out most objects shifted again by a tiny bit after 2 days. I tested out a few lines by fixing them in the block editor and saving it. But everything I reedit them, they shifted again.

I asked the coworker if he remember what he did, but couldn't come up with a solution. I tried not to move the ucs, but results were the same. Please help.

I tried not to move the ucs, but results were the same.

Are you working on the WCS, or a defined UCS, or something else? If you're not measuring from a known UCS, that could certainly explain it.

I have been working on the WCS these days, but objects seems to keep shifting every time I open block editor.

I have been working on the WCS these days, but objects seems to keep shifting every time I open block editor.

That certainly makes it sound like a UCS problem, either that you are assuming you are in WCS, which you are not, or that the blocks were created and saved in a UCS (not WCS).

MMs are just fine for the building industry, anything more is going to fall on deaf ears.. Go out in the field and show one of the guys on site a measurement like 3575.00000002 mms and watch him VERY carefully as he lays it out, it never ceases to amaze me how they do it so quickly to such precision. Come back five minutes later and tell him there has been a revision and that it should now be 3575.1, best not hold your breath until the layout is corrected.

The sites I draw cover acres, (sometimes miles) and everything I draw that is supposed to be a certain measurement, IS that measurement. I always have my units turned up to the highest precision, and if something is off by 0.00000001 either linear or angular, it's wrong. No, I don't actually have any measuring devices that are capable of measuring that degree of precision, but neither does is take any more effort to draw to that precision vs only drawing to the nearest 1/10th or 1/100th.

Nestly dont forget the curvature of the Earth need to take that into account v's plan measurement ove long distance.

I'm not concerned about the effect the the curvature of the Earth has on the field construction. My requirement is that an object in AutoCAD that's supposed to be 1 mile long, must be 5280.00000000', not 5280.00000001'

I'm not concerned about the effect the the curvature of the Earth has on the field construction. My requirement is that an object in AutoCAD that's supposed to be 1 mile long, must be 5280.00000000', not 5280.00000001'

I understand where you are coming from nestly, I never OVERRIDE measurements because they are not accurate, that just annoys me no end.

Just playing the devil's advocate for those who may have never been to a site.

As a woodworker of many years, and having prided myself in a very high level of precision using tools from Starret and the like, when working to 32s or 64s, occasionally I find myself fixing or adjusting something in a drawing by .003mms, and I have to laugh, as I fix it, which I always do.

Nestly dont forget the curvature of the Earth need to take that into account v's plan measurement ove long distance.

Oh come on BIGAL, been a tough enough morning already, would you now have me believe that the world isn't flat?

Oh come on BIGAL, been a tough enough morning already, would you now have me believe that the world isn't flat?

The world is as flat and wide as my monitor screen

but neither does is take any more effort to draw to that precision vs only drawing to the nearest 1/10th or 1/100th.

why can't people understand that? I have many pet peeves but nearly all of them stem from avoiding the correct BUT EASY way of doing things!