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Author Topic: Totnes Castle 1884  (Read 4513 times)

hammer

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Re: Totnes Castle 1884
« Reply #50 on: February 02, 2018, 11:16:43 AM »

Finished the deck marked 7 varnished, will be put to one side now. Starting on the engineering next, well sort of? The bearing housing from wood, but as this is a prototype change of plan. Making them as small as I can still a tight fit in side the wheel. So will be letting them into the side of the hull, with a brass plate over. Plate bolted from inside that is the plan. every thing has to removable.
Loaded the 103mm tube in the lathe, as you can see pushing it to the limit. I have fitted an computer fan on the motor, rotating slow, the motor fan is not strong. I burnt 2 motors before this mod. I may just score it finish with a hack saw. The big decision place to cut.
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Brian60

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Re: Totnes Castle 1884
« Reply #51 on: February 02, 2018, 04:12:58 PM »

Cor, you don't throw anything away do you. I remember those compasses from primary school 57 years ago! :embarrassed: I like the novel approach to holding the cylinder in the lathe, I think I would be wary about trying to turn that at any speed on such a small lathe. I think you are right to do it with a hacksaw, although I would turn the lathe head by hand and just lightly score it with the tool to make sure the cut was plumb. Leave it in the lathe to use the hacksaw, just move the toolpost way down the bed for clearance -  I mean cut by hand with no power applied! I have seen (and been guilty of) turning on the power and holding the hacksaw against the workpiece, albeit mine was small diameter rod not tube.

hammer

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Re: Totnes Castle 1884
« Reply #52 on: February 02, 2018, 07:29:20 PM »

Your right Brian, scoring won,t be a problem itís when it breaks through. That would stall it.
Yes I never throw any thing away.
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hammer

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Re: Totnes Castle 1884
« Reply #53 on: February 07, 2018, 09:24:32 AM »

New arrangement of bearings. Drilled hole with brace & bit ( brutal ) did the job though. The outer bearing bedded in silicone, Stainless plate & shaft fixed temporary wile silicon sets. Fixing perfect alignment. The inner bearing clear of plate & inner hull.  The screws in the plate will be replaced with studs through to the inside. Secured with nuts so it all can be removed if necessary.
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hammer

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Re: Totnes Castle 1884
« Reply #54 on: February 09, 2018, 10:51:52 AM »

Tube for boiler cut, mostly with hack saw then cleaned up in lathe. The big dot the funnel, small dot safety valve positions.
Made studs & nuts 5BA. brazed to plate. What next?
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hammer

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Re: Totnes Castle 1884
« Reply #55 on: February 13, 2018, 04:32:18 PM »

Pictured the fire tube mock up. I will try the burner (one off another boiler) to see if the flame stays alight. As the straight section is shorter than I have had before. this will be my 7th boiler. Another trouble I have had keeping the flame in the funnel. This was with a 22mm fire tube, needed a number 3 gas jet for this. but unobtainable. Never had trouble with 28mm & number 5 jet.
This might upset a few so what. The boiler rules H & S gone mad. For a rail engine boiler up around 100psi hauling passengers yes agreed. But for a small boiler at 25psi NO. Also if it runs dry, with the burners used the silver solder will never melt.  Try making a boiler with a normal gas torch imposable, even a MAPP burner needs the boiler insulated. What happened to the 3 bar litre rule. I just believe home made boilers are not wanted any more.
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hammer

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Re: Totnes Castle 1884
« Reply #56 on: February 14, 2018, 11:07:49 AM »

I thought that little rant would have got a response.
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Tafelspitz

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Re: Totnes Castle 1884
« Reply #57 on: February 15, 2018, 07:10:06 AM »

I have no idea what you're doing, or talking about mostly, so just curiously and silently watching in awe  :embarrassed:
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Brian60

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Re: Totnes Castle 1884
« Reply #58 on: February 15, 2018, 07:32:52 AM »

I thought that little rant would have got a response.

I understand your frustration. Its always seemed overkill to test model size boilers the same as full size boilers and of course with the kind of costs involved to have it tested. One of the reasons why I have never bothered with live steam, even though I have the skills to build one.

I've often wondered would it be worth doing it and sailing it on open water when there are no other boaters around? Nobody to ask questions and only you to see any calamity and ship sinking should it go wrong.

hammer

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Re: Totnes Castle 1884
« Reply #59 on: February 17, 2018, 10:35:53 AM »

Don't worry Tafel I don't know ether.
Brian although I have a friend who tests my boilers ( he is a rail man). My sailing club has never asked to see a certificate, & I do have public liability. So no problem. It is just strange the Power Boat Ass osiation, is more stringent than the Engineering Society. Oh dear I have left a space in association!
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hammer

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Re: Totnes Castle 1884
« Reply #60 on: February 17, 2018, 10:42:38 AM »

Enough of that. Brazed up the fire tube. Two fins on the end by the burner, to compensate for the lack of cross tubes in this area. Cross tubes here will disrupted the burner. The next job silver solder in the cross tubes, cut in photo.
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