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I MADE THIS MARINE ENGINE FROM A
SET OF STUART TURNER CASTINGS.
THIS IS NOT A EASY JOB, IN FACT
I THINK IT IS A GOOD "SKILL TEST"
FOR ANY MODEL ENGINEER.
I THINK THE MOST DIFFICULT PART
IS THE TURNING OF THE DOUBLE
THROW SPLIT ECCENTRIC FOR THE
MIDDLE OR I/P CYLINDER
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| USEING A COMPRESSED AIR DRILL ON THE LATHE |
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I MADE UP A ANGLE BRACKET,BOLTED
IT TO THE CROSS SLIDE AND BORED
A HOLE AT CENTRE HIGHT TO SUIT
THE COMPRESSED AIR DRILL, THE BORE
WAS THEN SPILT AND A SCREW FITTED
IN ORDER TO CLAMP THE DRILL.
THIS SETUP WORKS WELL WITH THE
HEADSTOCK DIVIDING ATTACHMENT.
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I HAD A OLD CHUCK THAT WAS NOT UP
TO MUCH, SO I ANNEALED THE JAWS,
MILLED OFF THE STEPS AND THEN
SILVER SOLDERD MILD STEEL BLOCKS
TO THE JAWS.
I THEN MADE A SIMPLE JIG TO MILL
THE END OF EACH BLOCK TO 120 DEG.
THE JAWS ARE THEN TURNED UP TO
SUIT THE JOB IN HAND
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I MADE UP THIS TAPER TURNING
ATTACHMENT FROM A HEMINGWAY KIT.
IT IS BASED ON A GHT DESIGN BUT
EMPLOYS A 40tpi SCREW FOR FINE
AJUSTMENT INSTEAD OF THE GHT
RADIAL WORM SYSTEM.
MORSE TAPERS AND TAPERED HANDRAILS
ARE NOW VERY EASY TO PRODUCE.
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