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| Repairing a high quality model marine engine |
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| bogstandard:
Darren, I suggested just sending me the caps, but they insisted I take the whole motor. Most probably they have heard about my reputation when working with wiggly amps :zap: Who am I to tell them what to do? Maybe they just love me as well as I do them. :lol: John |
| kvom:
Is that a standard collet you were using to hold the hex stock? Very interesting process to make those nuts. :clap: |
| bogstandard:
Kvom, Over the years, I have found that buying hex collets is just a waste of money, as hex can easily be held perfectly in a round collet as long as you place the hex into the collet correctly, that is, keeping the corners on the hex away from the three slots. If you were machining some nasty stuff hex bar, which puts a lot of force on the cutting tool, then yes, use a hex collet, but otherwise you will find a round collet just perfect. Square bar is another matter completely, and I have square collets in standard metric and imperial sizes. You can sometimes hold square in a round collet, but very infrequently can you hold it perfectly, because of the slot positions. For large square or odd sizes, I use my four jaw self centring chuck. John |
| Darren:
--- Quote from: bogstandard on May 08, 2009, 05:28:25 PM ---Most probably they have heard about my reputation John --- End quote --- That may have some bearing, :ddb: |
| bogstandard:
Here is an actual video of this engine before it was sent to me. I can now see why the rear end of the engine overheated, the burner for the boiler is directly below and to one side of the hot end. My customer has now moved the boiler back slightly, and that should alleviate the problem. The continual drone BTW is the burner for the boiler making itself known. It also shows the problem of getting the engine running and going into reverse from a standstill. A good day yesterday, lathe fixed and an old steam friend and mentor contacted me, and he came up with the destructions for getting the timing spot on for this particular model of engine. It was pure luck that the lathe went down, instead of having the engine set to general running settings (perfectly OK), it will now allow me to get it perfect (or as near as can be done with the coarse thread adjustment available). Finish off the acorn nuts, and another couple of hours retiming the engine, and I should be done. Bogs |
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