Model Steam Locomotive Building (Lap and Lead) - Dyak pt 23.

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This is Steamworx, a Model Engineering channel. Building Dyak continued...

The start of making the motion work!

Building this model steam engine in 2 1/2 inch gauge, Dyak (an LBSC design) continues with construction of the lap and lead components of the motion work.

There are four essential parts to the lap and lead motion each of which has its own machining challenges. The ‘LAP’ is the amount the valve covers both steam ports preventing the steam from entering the cylinder during the exhaust phase. The ‘LEAD’ is the port opening event as the piston reaches the end of its stroke. Both are essential to get right for proper operation of the valves.

Some errors have sneaked in which you will see resulting in me having to make a couple of parts twice, not something I enjoy doing!

As always there is nothing to hide here, mistakes are made from time to time. I don’t re-make things off camera you get to see the finished article warts and all!

I hope you approve!

Please comment and subscribe, let me know what you think or would like to see!

Enjoy!

If you are interested in 2½” gauge locos please visit ‘The National 2½" Gauge Association’ at https://www.n25ga.org/
Castings for this and many other locos available from Kennions at https://www.kennions.co.uk/