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| PeterE Tries to Build a Trojan ... |
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| saw:
Good progress keep up the good work :clap: |
| doubleboost:
Looking good peter :thumbup: :thumbup: Like you say Some counter weights would be a good idea (change wheels work great ) :lol: :lol: Bronze is really nice to machine :drool: Alloy bronze can be a pain to drill & tap :lol: :lol: |
| OldMetaller:
Hi Peter, I've just bought a set of castings for this engine, so I will be following your build thread with great interest! Regards, John. |
| PeterE:
Thank you for kind words benni and rob! John, I hope you can find some useful info, even if only to avoid my mistakes ... Rob, Yes bronze is nice to machine and this casting also seems good to drill and tap but it is good to know that it can be a problem to take into account. Have been occupied with the last phase of replacing the old and worn-out roof tiles on my garage/storage/hobbyarea. Found some time for metal work and thought that after this I would be ready with the main dimensions of the cylinder. Started off well, but at the second cut the toolbit dug in into the quite soft bronze :bang: Not a complete disaster but enough to make me re-think the setup. Obviously the cylinder had moved under load even though I tightened the screws quite hard. In an attempt to correct the errors, I set the cylinder up using the 4-jaw instad. The jaws are big enough to grab the cylinder on the flat sides and thus keep the port face perpendicular to the lathe axis, like below. The setup was better but I did not get it absolutely correct :bang: :bang: The port face is now at the correct distance from the cylinder bore when measured on the centerline which is good. The question is if I can live with the fact that the port face and then the valve "box" leans very slightly to one side. Since the centerline is OK it will not affect the centerline of the valve rod even though slightly skewed. Well, well, I will see where this goes. In the worst case I have to get a new cylinder. |
| NickG:
This will be an interesting project Peter, I often used to look at trojan castings when I was younger. I must admit, I preferred your first setup but with another angle at the other end ... or, the same way on the milling machine but with a piece of packing under the other end. Difficult to get things lined up in the 4 jaw like that and the chances are you'll leave big marks from the chuck jaws in the gun metal. Nick |
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