Powderd metal valve seats

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https://register.gotowebinar.com/register/4712477558535316494

AERA webinar
these are the ones I've used for years
there was a learning curve
cutters, coolants, etc
of course nickel based seats have their own requirements as do berrillium
and there are some new coper infused berrullium alternatives


I stopped using BC seats in 1999 and switched nickel bronze or something Kibblewhite makes. Same price, better machine-ability and not carcinogenic.

There may be better out there now than what Kibblewhite had then, but it won’t be BC. They don’t cut, they smear. The tool bit needs different geometry and it’s only good for BC. Because the materiel isn’t so soft it plows up in front of the cutter and then as the cutter passes it leaves the seat out of round. I just HATE BC seats.

BTW, I signed up for the seminar. I’ve used thousands of powered metal seats. As long as the cutter was sharp and you didn’t crowd the tooling it machined fine for me. I had a relatively rigid machine most of the time.

I still prefer ductile iron seats for steel valves in racing junk. More money but dang do they machine nice.
 
we were using powdered metal in propane, cng and pollution sucking bad gas out of the ground applications
whose ductile seats
I've had to replace too many "chrome moly" cheap seets
I call them "muffler tubing"
 
we were using powdered metal in propane, cng and pollution sucking bad gas out of the ground applications
whose ductile seats
I've had to replace too many "chrome moly" cheap seets
I call them "muffler tubing"


I got the DI seats from Kibblewhite, CV Products and one other place I can’t think of.

Then one day the dim bulb in my brain went on and I realized...”you’re a machinist...why are you BUYING sized seats that may be bigger than you want, or the wrong thickness, or the ID is not what you want...why not buy a stick or two of ductile iron stock and make my own”?

So I started making my own seats. I charged extra but it was worth it. I could make them any thickness I wanted, any OD or ID...whatever I wanted.

I also had adjustable cutters so I didn’t need a nominal OD.
 
I cut plastic injection molds and we cut BC inserts. You need to use neutral rake cutters, positive and negative rake tooling cuts like ****.
 
I cut plastic injection molds and we cut BC inserts. You need to use neutral rake cutters, positive and negative rake tooling cuts like ****.


I agree. But then you need extra tooling just for the BC stuff.

I’d rather not deal with it and just use nickel bronze.
 
I would think any nickel alloy would hold up to repeated striking better than BC. I have cut forging dies as well and they are tougher to machine than alot of other tool steels.
 
I think BC seats were good for Ti valves but others will work, too.
 
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