• We invite you to join UKWorkshop.
    Members can turn off viewing Ads!

Object weight for material conversion

UKworkshop.co.uk

Help Support UKworkshop.co.uk:

Kryten602

Established Member
Joined
23 Aug 2017
Messages
33
Reaction score
0
Location
Kettering
Not sure if there is a quick way to determine this but if I have an irregular shaped, small solid object made in plastic that weighs 8g, what will it weigh if made in steel?
 

Cabinetman

Established Member
Joined
5 Jan 2017
Messages
2,078
Reaction score
1,058
Location
lincolnshire Wolds
I think it’s time for an Archimedes Eureka moment, Fill a jar with water and immerse the object – or 10 of them if it’s small, the water that overflows is the volume, then look online for the weight of steel for that volume, Ian
 

Richard_C

Established Member
Joined
17 Oct 2019
Messages
564
Reaction score
241
Location
Cambridge
I would do exactly as Cabinetman suggests, but I would also do a sanity check via arithmetic. There are all kinds of density tables on the internet. The ones below seem straightforward, especially if you know what the plastic is.



Most plastics are around 1.2 gm/ccm, most steels are around 8 gm/ccm: your 8 gram plastic item would be around 50 to 55 grams in steel (8x8/1.2).

The volume in water method will be more accurate, but I'm a pessimist, I like to do things 2 ways of I can to avoid silly errors on my part.
 

TheTiddles

Established Member
Joined
14 Oct 2007
Messages
2,679
Reaction score
600
Location
Wiltshire
If you know what plastic it’s made from, you can skip the water play, just use a calculator. 8g of water is a very small volume, your error will be large
 

Alpha-Dave

Established Member
Joined
18 May 2015
Messages
361
Reaction score
133
Location
Durham
Is your object solid plastic or 3d printed with voids? If the latter, then 7x will be an underestimation.
 
Top