Petters Pump

[CI]

Looks great !
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[maury]

Thanks for tuning in guys. Hopefully I'll be soon back in the shop cutting metal.

[maury]

I Had some shop time, so I thought I'd do an update. The base had only a little machining,and was fairly strait forward.
The same for the pulleys, still need to make the bearing for the idle pulley and do a keyway for the drive pulley. The gears were made on my Barber Coleman gear hobber. I needed to make a work arbor for the bull gear to support the outer rim to avoid chatter while hobbing.
I worked on the cylinder and inlet and outlet pipes. Unfortunately the pipes were badly chilled. I could not machine them, even after two annealing sessions in my oven. Maybe I'll have to make them out of bronze or aluminum.I very much prefer iron, and am having talks with the foundry about thus. My hope is that the melt was contaminated and the castings weren't chilled.
maury

[CI]

Nice castings, and pretty intricate too !
Following along.
 

[Jasonb]

I wonder if adding some more machining allowance to the pipe patterns would help with reducing the risk of chill. Would be easy to make the flanges thicker.

The lugs for the tie rods may not be so easy, possibly add a cylindrical extension top and bottom that can be machined away like a spot face or extend them outwards and accept a fettled end which the removal would require. Both would put more metal where the casting is thin and help slow cooling.

What does the air dome machine like? that would indicate if there is contamination or just the thin flanges and lugs cooling too fast on the pipe castings.

[maury]

Thanks for the comments guys.

I may end up adding more metal to the machined surfaces as you suggest.

First I want to make sure that casting the metal was ok. I once used a foundry which is now gone. I once had them make castings with area that needed to be drilled that had a 1/8 cross section. There was no issue with chilling on these castings, but the has a 2000 lb ladle. I suspect with my latest castings, the metal has cooled too much before pouring, and if my mold was at the end of the pouring line it may have cooled.

I also had some castings made by another foundry that had hard spots on a thick flywheel. When asked they admitted pouring my castings from a melt that was for a customer making some kind of pipe flanges. They added something to the melt that hardened the iron. After that, I specified Class 20 grey iron only.

[maury]

Ok, I'm finally getting around to posting these parts. I'll be waiting for the new CI parts from the foundry. But in the mean time I think I'll have some adventures in powder coating the parts I have.

[CI]

Nice !
.

[maury]

Well, there has been some progress, but there has been an issue with getting the inlet and outlet piping castings. First try the iron castings were either contaminated or chilled. no amount of annehling would soften them. So my friend tried to cast them from brass, but his cores failed.We had the foundry make some air set cores, he cast the parts in brass and now we have good parts. But I think the problem is still not really solved. Maybe they will have to be cast solid, drilled and plugged :<(

[CI]

 

[Jasonb]

They would be good candidates for 3D printing, you could get them done in stainless. I had some pipe elbows done recently for 6mm and 10mm pipe.

I don't have enough thumbs so will just say all the engines you have updated up with today are looking good.