Melting Crankshafts

You're probably wondering why I cuting timing gears off these three crank  shafts is because we going to use these  gears and the ones that came off here  for a future project here is all the scrap it's being cut up to bite-sized chunks as I will be using the a crucible.

The metal has been added to the  crucible and we've got piece that's  sticking above the crucible or see if it  burns or not  this mole is a test mold for the  crankshaft we'll see how well it casts  this is a cylinder I need to make you'll  notice there's no vents on the core and  there's no vents in the sand mold itself  so I'm going to cast it up and see if it machines well but also to see sure  there's no flaws or blow holes in the  resulting casting adding ferrosilicon .

Ready to take the crucible layout  you here are the leftover pieces in the end  got you can see where they've hit the steel mold they are chilled but the rest  is great here are the larger ingots they're chilled they're still chill when  they've hit the steel mold at the bottom .

Here is the wedge test from the  crankshaft melt it's totally gray all  the way through the ferrosilicon has  done its job and what I'll do will drill  through the edge and see how soft it is  couldn't be any softer than that here is  a close-up of the drilled hole in the wedge test.

This is the only mold that  has a core in it we'll see how this one  turned out  here is the test casting are made from  the lawnmower crankshaft as you can see  it's just a simple in gate in here but  what someone's going to ask is why did  not put Vince in these top parts of the  mold well a simple answer is it doesn't need it  to show you there's a marker made .

There's the very top of the mold there  it is it's only barely above my finger  and that's all that's needed to fill up  that mold also here and as shrunk is a  depression and that is enough to feed it  there's no point in putting a long long  sprue on it to try and fill it up the mold  casting has machined up really well all  these surfaces the ball there are no blow holes slag inclusions or anything  like that I've got one more test .

To see how good this casting is okay this is  the final test for the steam engine  cylinder I've cut it in half and  sectioned it they'd like to see exactly  what looks like what I'm after is there any blow holes in the bore I  can't see any what I am also looking for this is where it was gated to see if  there's any shrinkage porosity and there is none and now we'll have a closer look  at the two halves  

So ,now I'm totally satisfied with this  casting turned out perfect which means I  can go ahead and machine the other four  castings are poured and they will be the  subject of future videos so what  happened to the metal that was charged  above the lip of the crucible  well absolutely nothing I charged .  kilograms of iron and all the castings  are weighed afterwards was six point  five one two kilograms so that works out  one point four percent loss so I've come  to the conclusion it...