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Home Model Engine Machinist > Showing Them > A Work In Progress > 5"g Simplex steam loco build (hopefully)

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Old Today, 01:41 AM   #141
Charles Lamont
 
Join Date: Mar 2011
Location: UK
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Yup - it should just crack the port open at each end in mid-gear. That is your 'lead', the amount of port opening at dead centres, whatever the position of the reversing lever. With Walschearts gear the direct motion from the crosshead via the anchor link and combination lever provides the lap and lead motion.

Just to confuse you a bit more, if the engine were a piston-valve job, with the 'inside admission' normal for that type of valve, the connections at the top of the combination lever are reversed so that the valve moves in the same direction as the piston, instead of the opposite way.

I don't qualify as young.




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