Prop re-pitching and casting.

[Terry Keeley]

Thanks, hopefully this jeweller will be able to do the casting for me.

 

[john bass]

how can I get one of the modified 2170 props modified for my GAS eagle SGX ...JOHN BASS...941*451*3585....THEY LOOK AWSOME

 

[john bass]

I NEED A 2170 SET UP FOR AN EAGLESGX GAS RIGGER....JOHN BASS...941-451-3585

 

[Terry Keeley]

Sorry, just for personal consumption.

Try Mark Sholund...

 

[john bass]

OK thanks for the reply

 

[Terry Keeley]

Got wax. They did one in a different wax which came out better than this one, that's the one they'll try to cast.

 

[Randy Rapedius]

Looking good Terry.

 

[Terry Keeley]

Look what followed me home from the pond today.

 

[Brian Sorgente]

Cool!

 

[dave roach]

So when will we have TK props.Like to put my order in.

 

[Terry Keeley]

So when will we have TK props.Like to put my order in.

Lol!

I couldn't charge enough!

 

[gil sonsino]

So you re ready to make some dental crowns...lol.

 

[Terry Keeley]

So you re ready to make some dental crowns...lol.

lol!

BTW, do you know the alloy that's used today for dental work?

Do they use vacuum casting machines or do some still use centrifugal ones like this?

 

[RaceMechaniX]

I can see Terry with a nice BeCu grill.

 

[Chris Wood]

Lol an terry is more a cobalt guy

 

[lohring]

Chrome cobalt alloys like those for partial denture frames should work well for props. I believe that alloy has been used on many commercial record setting props, especially for high power electric motors. I ran one on the gas scale boat that Kelly Gruol drove to the 2 lap record. The local dental lab in my area uses a vacuum melting and casting process. The centrifugal casting machine you have was used years ago but should work with the right alloy and an inert gas shielded torch flame. Find a lab in your area and see what alloy they use. My local lab quoted $80 to cast a prop from a furnished wax pattern. Brass & bronze alloys will cast a lot easier, though. One of my classmates used an ox/acetylene torch with a centrifugal casting machine to cast jewelry from brazing rod .

Lohring Miller

 

[XtremeRcBoats]

Terry can you explain how it works, I havn't got a clue how you can get a prop with these machines.

 

[Terry Keeley]

Chrome cobalt alloys like those for partial denture frames should work well for props. I believe that alloy has been used on many commercial record setting props, especially for high power electric motors. I ran one on the gas scale boat that Kelly Gruol drove to the 2 lap record. The local dental lab in my area uses a vacuum melting and casting process. The centrifugal casting machine you have was used years ago but should work with the right alloy and an inert gas shielded torch flame. Find a lab in your area and see what alloy they use. My local lab quoted $80 to cast a prop from a furnished wax pattern. Brass & bronze alloys will cast a lot easier, though. One of my classmates used an ox/acetylene torch with a centrifugal casting machine to cast jewelry from brazing rod .

Lohring Miller

Thanks Lohring, that's what I suspected. I did get a couple props cast in CoCr but wasn't happy with the finish on the bore or the drive dog, that's why I'm leaving mine solid and will finish after casting. That and CoCr is hard stuff! Regular tools don't touch it, you need diamond! $$$

I'm going to try one of the heat-treatable stainless steels that can get to a tensile strength of 210,000 psi, every bit as strong as most CoCr alloys but more workable.

I started this hoping a jeweller could do it, but, it's getting complicated so I decided to bring it "in house". The alloy I'll try melts in the 2600F range so that's quite a bit more than they're used to when casting silver and gold. Platinum is a little higher at 3200F but jewellers that do it are "high end" and expensive. The equipment I'm going to use is all rated for Platinum so hopefully it'll work well.

ps: I just looked at the properties of those dental alloys and this SS "as cast" will be stronger...

 

[Terry Keeley]

Terry can you explain how it works, I havn't got a clue how you can get a prop with these machines.

Very basically you make a high temp plaster mold of the wax prop, melt (burn) out the wax then sling molted metal into it. There's quite a bit of technique involved so I'm lucky to draw on a bunch of experience from a couple local guys.

 

[Ken Retallick]

All you need now Terry is an Induction furnace!