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I had two spare Ps4 tender trucks, now I have one.  One spare crumbled to pieces in the parts drawer. Now its trash (or maybe a scrap gon load).

I remember a call for a GG1 sideframe to use a a brass casting master.

I will donate my last truck to use as a casting master or a 3D print scan (or both).  GRJ would do you think Harry Henning be interested in Brass?  AlanRail  would you give it a try in resin?  Any other vendors, ideas, options

Not only do the side frames need reproducing the bolster block does too,

I've go too many Ps4's to have then sidelined by zinc rot trucks.  And yes they are a hot part as I know I have had at least 3 go bad, not counting the bad one Lionel sent me as a parts order.

Any takers?  Who else needs trucks or just a spare or two.

Gray Lackey

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Smooth On makes a silicone mold material that will withstand the heat of casting in pewter. I have not tried this so am not sure of the resolution of pewter but if I had to make these sideframes this how I would do it.

https://www.youtube.com/watch?v=D_BGMBmc7Pg

Good idea to reuse the bearings but new ones could be machined with oilite bronze.

I think a one part mold could work but the video shows how to make a two part mold.

Pete

@NHVRYGray posted:

"I had two spare Ps4 tender trucks, now I have one.  One spare crumbled to pieces in the parts drawer. Now its trash (or maybe a scrap gon load)."

"Not only do the side frames need reproducing the bolster block does too,

I've go too many Ps4's to have then sidelined by zinc rot trucks.  And yes they are a hot part as I know I have had at least 3 go bad, not counting the bad one Lionel sent me as a parts order.

Any takers?  Who else needs trucks or just a spare or two."

Gray Lackey

On which Lionel production run is this occuring?

Last edited by BobbyD
@Jan posted:

Doesn't one have to compensate for material shrinkage by making an oversized master. And isn't the shrinkage casting material specific?  Earlier replies on the GG1 sideframe issue mentioned this.  How would resins be affected?

Jan

Yes and yes.  There is shrinkage, and it is material specific.  Those were the lessons learned casting the GG1 sideframes.  The zinc ones looked great, but were about 1/4" too short, and obviously smaller in every other dimension.  The resin ones we ended up with held their size and worked very well.  But the specific material used for the casting has to be considered.

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