he's a robot. officially been confirmed

Sounds like a background noise that is filtered out when Keith talks...

new mic not working too well.

@@katelights, almost working too well! It sounds like it’s picking up to much background noise.

@@Hoaxer51 it's radio interference that gets automatically amplified by the recorder's pre-amps, it ducks down when keith speaks but stays in the background.

I think the big difference between plumbing pours and Babbitt pours is that you don’t want your plumbing to move afterwards and the oakum is packed in and left in place.

first shot is so cool, keith, the giant bandsaw and the cat :)

Sand was my first thought too.

That's what I was thinking, and I've never even done this.

Yes. I hear that a hollow tube is stiffer than a bar the same size a lot. You never strengthen a member by removing material. I think people get confused because a tube is stronger than a bar, if the same amount of material is used.

Hollow castings, where used, prevent hot tearing of the casting while it is cooling. Ask Windy Hill.

It’s not about strength. The wise engineer first looks at the loads first. Then you apply the material…. Enough to insure the stress in the material is appropriate. Think Young’s modulus here. Cast iron has a unique Young’s modulus in that you don’t have plastic deformation. It just snaps. The area of concern are the flange areas and bearing housings. The bigger problem is cooling. To get minimal shrinkage, no hot tears and no shrinkage voids you need constant cooling. A casting with thin webs and a massive solid core is a disaster. Even if you get it yo cool without defects it will be warped and the flanges may be hard as in white iron. The best approach is to keep your sectional thickness the same throughout. So this is a complex part but relatively constant in sectional thickness by using the core. Brilliant !!!!! The more patterns I make for old machines the more respect I have for the. Guys who designed these old machines.

@@stancloyd hot tears are most often seen from excessive localized stress concentrations caused by cooling. Areas to be weary about would be bosses for example. Fillets around the base of the boss not only simply the pulling of the pattern from the sand but minimize the likelihood of a hot tear in a sharp corner. Sharp localized transitions are to be avoided. The shrink rule for cast iron is often 1/8. That means that a casting could see 1/8 in per foot shrinkage. But the use of risers and complex geometry affects this. The amount of shrinkage can vary. In a slow cooling casting with risers feeding the part, you may see no shrinkage as the iron freezes around the sand but the riser feeds the cooling core.

When he files down the upper Babbitt halves you’ll see why they’re always poured this way. Alignment is a big part of it but the shims set the gap and therefore set the actual size needed for correct thickness. If it was practical to do it as you said it would have been done that way long ago.

At one time, hardwood was used as bearing material

Particularly a hardwood called lignum vitae, which has natural oils in it, and is so dense it sinks in water.

@@williamdodd8660 the old wringer washers used wood bearings on each end of the wringer rollers

To do that he would have had to drill into the side of piece (remember the cavity he was originally going to fill with paper, that is at the location he would need to put a vent). I and others thought the same, but I stopped and examined the pieces and realised it just isn't practical to do on this machine, I have seen other bearings he's poured that had vents built into the original bearing casting, and they went great without any splatter. Unfortunately he seems to be limited by the machines design + manufacture in this case, looking at the two halves of it there also was no-where for him to drill in a vent hole either due to it being two bearings either side of the cavity.

I'm sure he knows that. He's probably referring to casting irregularities and thermal properties that would be different in a solid piece. He does go on to say there are reasons, suggesting it's not just a simple as solid is better. I'm no expert with cast iron but I know it can be difficult.

I think it has more rigidity in the sense that it can’t bend itself out of shape with its own weight as easily when it’s cored. I think this is the main thing referenced when people say “it’s actually stronger”.

I was thinking the same but stopped the video and looked closely at the parts and realised nope... not without drilling a vent hole into the cast iron, then you run the risk of someone else down the line using for something else, or having to fill it in after the Babbitt pour is done.

He should have used his damming putty to make a funnel at the end of the bearings, and poured into the end of the shaft. Then the oil hole can be used as a riser to let the gases escape. I'm betting those bearings didn't turn out very good. Lots of gas trapped in the pour. You need a riser to let the gas out, and it keeps some pressure on the molten metal as it cools and shrinks.

Then the dog will come in, and do a lab test. 😁

Why as he pouring copper ingots in the kitchen?