Units in exported STEP files

[0E9B061F]

Is there any way to control the units used in STEP files exported from CadQuery? They seem to use millimeters by default which is making my parts much smaller than I had intended - I designed them so that 1 unit is 1 inch, not 1 millimeter.

[Liam Nordvall]

Nothing that I've tried but reading the documentation you should be able to use the doc_units parameter in the export function. Read the table at the end of the link to see what number cooresponds to 1 inch, in your case doc_units = 1.

So I assume without testing that you could write exporters.exportStep(result, doc_units=1). Try that out and let me know it it worked! 

Alternativly you can write a function like toInch were you use that in every meassurment.

https://cadquery.readthedocs.io/en/latest/importexport.html?highlight=unit

[Jeremy Wright]

https://github.com/CadQuery/cadquery/issues/1449

https://github.com/CadQuery/cadquery/issues/1375

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[0E9B061F]

It seems like `doc_units` must only work with the DXF exporter. `cq.exporters.export(wp, 'path.step', doc_units=1)` produces an error,  `cq.exporters.export(wp, 'path.step', opt={'doc_units': 1})` seem to do nothing (the exported STEP files are still in millimeters). I could use a function like `toInch` but my code is already pretty complex (I should have tested exporting a lot sooner, now I have a headache). I think I might try just editing the step files after exporting.

[Adam Urbanczyk]

Not currently implemented in CQ, but you can always use the OCCT API directly. E.g. setting units to um:

import OCP

w = OCP.STEPControl.STEPControl_Writer()
OCP.Interface.Interface_Static.SetCVal_s("write.step.unit","UM")

NB: This seems to be a global operation in OCCT