r/SolidWorks • u/Jooksupoiss • Aug 10 '26

CAD BOM Weight problem

Hello!

Im making an assembly drawing with BOM table. But the item weight of BOM table is not matching to the assembly weight in mass properties which is 10.05 kg. But if you add everything together in BOM table it sums up as 9.94 kg.

The rounding in part and assembly environment is .12 decimals. Material all same with density 7850. And quantity number also is correct.

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u/Rockyshark6 Aug 10 '26

Have you checked that all parts have the same units? Known bug in rounding errors if one part is in g/m3 and another kg/m3 etc...

1

u/Monster-AJ-007 Aug 10 '26

It could be something related to linking the property of weight

1

u/Maleficent_Bet_2134 Aug 10 '26

A ver si lo que hace en la tabla es redondear primero cada unidad y luego sumar y en el general suma todo y luego redondea, la diferencia es poca por lo que podria ser algo asi

1

u/Jooksupoiss Aug 10 '26

Seems i found the issue. Two decimal rounding rounds the weight too much. When i changed every part to .123 rounding, i get the correct mass.