Some months back the owner of the Princess Marina I've been making bits for asked me to do the cylinders. These were ordered from the UK.
Today was spent measuring the extra metal and machining the faces and bores, the rearmost cover face and the bore being done square to each other.
I've decided to have a go at boring them out on the mill rather than setting them up on the lathe. The quill on the milling machine has a slow feedrate available and it seems to leave a reasonable finish on the first few cuts done.
Last time I used the boring head was boring out a big end bearing for a full size locomotive. The arbor and boring head are attached by a fine thread on the end of the arbor. The boring bar out the end of the boring head in that orientation (horizontal) requires the machine to run in reverse for the tip to cut. The intermittent cut on the big end bearing caused the head to unscrew from the arbor until I realised what was happening! Certainly made me jump at the time as the tool being out a long distance is very unwieldy and makes you think twice about where its going!
So some loctite bearing mount (610?) was used to lock up that thread so it wouldn't unscrew again. Didn't want to use threadlocker as its weaker than 610 and can still be undone with tools, happy to know some heat will get it undone. Wasn't happy to put a weld on it as it was brand new and may need another arbor in time to come!
Happy steaming!
Nigel
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