legacy unit insertion scale bug in metric autocad

[Anonymous]

Every time a block is inserted or even copied linework is pasted to a AutoCAD 2019 drawing it scales up by 25.4, as if it was going from millimetres to inches. This happens without fail.

I have checked the units they are all in millimetres.

insunits                 = 4

insunitdefsource = 4

insunitdeftarget  = 4

The help file states that "4 = millimetres".

The work around seems to be either W-block every single of the thousands of blocks in our block library so that they are based in AutoCAD 2019 architecture (which should only take 2 or 3 months worth of man hours) or set the new drawings up as though they are in inches by setting it up so that:

insunits                 = 1

insunitdefsource = 1

insunitdeftarget  = 1

The help file states that "1 = inches".

We do not or have ever worked in inches.

Is there an update or patch available to fix this Bug?

In Civil 3D in the Options window it has a AEC menu, this has legacy drawing options to control the units of legacy blocks and files.

AutoCAD vanilla and Plant 3D do not have this option in the Options window.

Is there a system variable that controls this?

[ChicagoLooper]

1. Make sure you are using a metric template, not imperial. 
2. On cmd line, type DWGUNITS and proceed through all options, carefully reading and selecting each one according to your needs.

[Anonymous]

Thankyou ChicagoLooper,

The DWGUNITS are set to 3 (millimetres).

However I did as you suggested ("On cmd line, type DWGUNITS and proceed through all options, carefully reading and selecting each one according to your needs.") and carefully went through the options.

At the end of the routine I came across this:

Scale objects from other drawings upon insert? [Yes/No] :

I changed it to which seems to have fixed it.

AutoCAD must default older files to "inches" even though the units are set to "millimetres", which is odd to me.

[cadffm]

DWGs without AECinformations (= in DWG or there template never started the -DWGUNITS/AECDWGSETTINGS command in the past),

for imperial drawings(measurement=0) the default is 1 (feet),

for metric drawing(measurement=1) the default is 4 (millimiters).