hi,

i am not familiar with the aqua calc that is mentioned. if brian's post helps more, that's great! what i thought your first post was saying is that you built a solid part and measured it's weight. so you knew the weight and volume. however, you didn't know the density and based on what you are saying lead does not have a consistent density. i am not familiar with lead. so i was just reading your first post and it reminded me of some things from a previous life. it seems like you already know everything you need to, to calculate the density of the part you made. with that value you can do any calculation you wish. you shouldn't have to worry about how different it is from some other density and constantly adjust calculations. that would drive you nuts and possibly cause mistakes. just using the density per batch should be sufficient. obviously, the volume and weight will have accuracy limitations. so the density you calculate is not going to be perfect. but it will be as good as it can be. scales are not very accurate. i think your volume calcs will probably be of a higher accuracy. but it really doesn't matter much. it's only going to be so good. i'm assuming, also, that you have the standard density of lead to compare to. it seemed like you were saying it's not matching. lastly, i always do all my calcs in metric units. they are full proof. i use unit conversions on the inputs and outputs. this particular problem is simple enough that you could probably do it all in english units, if you have to. it's more of an issue when you write code with tens of thousands of calculations. it's full proof in all metric. also, all standards labs use metric. so any given constant is actually figured out in metric units.

i hope you figure it out. it seems like you are close and brian's help is pushing you over the finish line.