Tony Bird
Senior Member
Hi,
The bottle empty and cogitation over; the decision reached being that work would continue with the complete cylinder, while thoughts would continue of what to do about the off-set ports of the other cylinder.
Now the previous put off problem, of what to do about the lack of piston clearance in the cylinder needed to be addressed.
As can be seen on the drawing made of the cylinder assembly the shoulders on the cylinder covers are quite thick. (P.020).
So each the cylinder covers shoulders were reduced in height by about 1.5mm (small 1/16”) which added to the previous minimal piston clearance hopefully would be enough for the engine to work well. (P.021).
The cylinder bore had been accurately bored, so a ‘0’ring was fitted on the piston. (P.022).
A bracket similar in design and from the same material to the bearing stand was made for the cylinder assembly. (P.23).
A magnet was used to hold the cylinder bracket with the cylinder attached to the engine base plate. With the piston at TDC and later a BDC marks were made on the base plate which showed that there was 4mm (large1/8”) maximum clearance between piston and cylinder covers. The 2mm (large 1/16”) clearance at both ends of the stroke should be enough. The cylinder bracket would be bolted to the base plate half way between the two marks made on the base plate. (P.024).
Before the cylinder bracket could be bolted to the engine base plate a port block needed to be made. Alas there was no brass in stock thick enough for the job, so two sheets of brass were hard soldered together. To stop the two sheets of brass floating on the melted solder two rods in slightly large holes were used to stop this. One of the sheets of brass was larger than the other to give an edge to feed the solder in. (P.025).
When soldered together the port blocks were machined to size using a lathe. (P.026).
The port block was drilled for the cylinder trunnion which allowed the cylinder bracket to be bolted in position on the engine base plate. (P.027).
It was becoming obvious that the engine bed plate needed a base to sit on and some timber off-cuts from making a garage door were used for this. The engine base being glued together. (P.028).
The base finished with rubber feet and the engine and its base plate fitted. The drilling jig for spotting the steam ports being in place. (029).
To be continued……
The bottle empty and cogitation over; the decision reached being that work would continue with the complete cylinder, while thoughts would continue of what to do about the off-set ports of the other cylinder.
Now the previous put off problem, of what to do about the lack of piston clearance in the cylinder needed to be addressed.
As can be seen on the drawing made of the cylinder assembly the shoulders on the cylinder covers are quite thick. (P.020).
So each the cylinder covers shoulders were reduced in height by about 1.5mm (small 1/16”) which added to the previous minimal piston clearance hopefully would be enough for the engine to work well. (P.021).
The cylinder bore had been accurately bored, so a ‘0’ring was fitted on the piston. (P.022).
A bracket similar in design and from the same material to the bearing stand was made for the cylinder assembly. (P.23).
A magnet was used to hold the cylinder bracket with the cylinder attached to the engine base plate. With the piston at TDC and later a BDC marks were made on the base plate which showed that there was 4mm (large1/8”) maximum clearance between piston and cylinder covers. The 2mm (large 1/16”) clearance at both ends of the stroke should be enough. The cylinder bracket would be bolted to the base plate half way between the two marks made on the base plate. (P.024).
Before the cylinder bracket could be bolted to the engine base plate a port block needed to be made. Alas there was no brass in stock thick enough for the job, so two sheets of brass were hard soldered together. To stop the two sheets of brass floating on the melted solder two rods in slightly large holes were used to stop this. One of the sheets of brass was larger than the other to give an edge to feed the solder in. (P.025).
When soldered together the port blocks were machined to size using a lathe. (P.026).
The port block was drilled for the cylinder trunnion which allowed the cylinder bracket to be bolted in position on the engine base plate. (P.027).
It was becoming obvious that the engine bed plate needed a base to sit on and some timber off-cuts from making a garage door were used for this. The engine base being glued together. (P.028).
The base finished with rubber feet and the engine and its base plate fitted. The drilling jig for spotting the steam ports being in place. (029).
To be continued……
