Amati Bedford Whaleboat - 1860

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Re: Amati Bedford Whaleboat - 1860

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Re: Amati Bedford Whaleboat - 1860

Postby bird_d00 » Mon May 29, 2017 9:21 pm

Depending on the grade of whitemetal, it's melting point is more likely in the range 200-250 C. I would have thought that silicone bath sealant would be problematic at that sort of temperature, even if you could control the temperature accurately. Why not just plain old plaster of paris available from most local chemists ? Just be careful to let dry thoroughly before casting metal into it, or the results can be "entertaining". Guess how I found that out !

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Re: Amati Bedford Whaleboat - 1860

Postby Mark » Tue May 30, 2017 3:29 am

Thanks Dave. I guessed at sub 200c purely as it melts with a soldering iron. Fingers crossed on the silicon sealant tho !
Hadn't thought of plaster of Paris, but no idea where to get that in Hong Kong. Chemists aren't quite as good as they are in the U.K.
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Re: Amati Bedford Whaleboat - 1860

Postby steve131 » Tue May 30, 2017 1:26 pm

Hope it goes well ,that Zamac sure is tough stuff :angry-banghead:
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Re: Amati Bedford Whaleboat - 1860

Postby wingnut » Tue May 30, 2017 4:35 pm

Hello Mark, I hope everything turns out well for you, my main concern is "bathroom sealant" there are 3 (common) products that come under the bathroom banner....
Mastic based, silicone based and 1 called plumbers Mait, I would steer clear from all 3 !!! I shudder to think of the consequence's but it's not safe !
The only safe way I can think of is the "lost wax" process but that's a bit long winded.
If you do try with 1 of the options please do it near a sink and think of your safety at all times.
Sorry to go on about it.
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Re: Amati Bedford Whaleboat - 1860

Postby Mark » Tue May 30, 2017 5:30 pm

Thanks for your concern Mike. The stuff I have is silicone based, acetic acid type stuff (smells of vinegar !)
From what I recall, it just breaks down if it gets too hot. I don't think it catches fire. However, it's a kitchen job, in a metal tay to catch the fallout if it all goes pear shaped ! Wet towel on standby just in case !!
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Re: Amati Bedford Whaleboat - 1860

Postby Mark » Wed May 31, 2017 6:06 am

Here is the silicone mould. Finger's crossed !! From what info I can find, 200C seems to be a commonly quoted upper limit for silicon sealant. I'm hoping that the stuff I've used is similar, and that it doesn't disintegrate instantly at just over its limit.

ImageUntitled by Mark Wakelin, on Flickr

On to the bow. There is a sort of box section in the bow. This is the drawing.

ImageUntitled by Mark Wakelin, on Flickr

Which is made up of these parts.

(Photo awol)

First off, join the two sections of base together, using an offcut to reinforce the joint.

ImageUntitled by Mark Wakelin, on Flickr

A bit of trimming and it looks like this. Too much gap at the front. I think I can do better than this.

ImageUntitled by Mark Wakelin, on Flickr

I think I need quite a bit more trimming and fitting.
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Re: Amati Bedford Whaleboat - 1860

Postby Mark » Thu Jun 01, 2017 1:31 pm

After lots of trimming I got a reasonable it. The bow still didn't look quite right, so I added a couple of offcuts of 2x4mm plank to make it look like the keel is a bit thicker and comes back farther.
The bottom of the box section had a coat of Mr Surfacer 500 and was sanded flat to hide the join.

ImageUntitled by Mark Wakelin, on Flickr

Quite pleased with this now :)
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Re: Amati Bedford Whaleboat - 1860

Postby steve131 » Thu Jun 01, 2017 2:10 pm

Great job :clap:
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Re: Amati Bedford Whaleboat - 1860

Postby number1 » Thu Jun 01, 2017 6:06 pm

As Steve said, great job :clap:
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Re: Amati Bedford Whaleboat - 1860

Postby casper » Thu Jun 01, 2017 7:43 pm

looks excellent Mark :clap: :)
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Re: Amati Bedford Whaleboat - 1860

Postby Mark » Fri Jun 02, 2017 12:56 am

Thanks guys :D
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Re: Amati Bedford Whaleboat - 1860

Postby Mark » Sat Jun 03, 2017 7:45 pm

Well, the casting was a dismal failure. The silicone handled the heat fine. However, the white metal didn't fill the mound fully, and seemed to go very hard. It overfilled the mound too, so there would have been three weeks of filing to get it back to size.

ImageUntitled by Mark Wakelin, on Flickr
Plan b, makes some from wood. Watch this space ;)
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Re: Amati Bedford Whaleboat - 1860

Postby Mark » Tue Jun 20, 2017 5:14 am

A bit more progress, some of the details in the boat are going in, and the seats (thwarts ?) are being fitted. The brackets that hold these in places are somewhat fiddly, and there some other reinforcements that look like they will be 'entertaining' !!

ImageUntitled by Mark Wakelin, on Flickr

ImageUntitled by Mark Wakelin, on Flickr
Bad news though, the wedding has been brought forward to September :angry-banghead: :angry-banghead:
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Re: Amati Bedford Whaleboat - 1860

Postby steve131 » Tue Jun 20, 2017 9:17 pm

How much you got left to do ?
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Re: Amati Bedford Whaleboat - 1860

Postby Mark » Wed Jun 21, 2017 12:30 am

Yeah, a fair bit. Lots of details to add, plus oars and masts and rigging.
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Re: Amati Bedford Whaleboat - 1860

Postby casper » Sat Jun 24, 2017 5:31 pm

looking really nice Mark :clap: :clap:
hope you have it finished for the wedding
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Re: Amati Bedford Whaleboat - 1860

Postby Mark » Sat Jun 24, 2017 6:02 pm

Thanks Casper - I hope it's finished in time too !!!!
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Re: Amati Bedford Whaleboat - 1860

Postby Mark » Mon Jun 26, 2017 5:39 am

These brackets (I think they are called knuckles, but could be wrong) need to be extended. The instructions tell you to use 2x2mm strips. Trouble is, the knuckles are only 1.6mm thick, so that doesn't work !!
Plan B is to cut strips from the spare wood in the laser cut fret that the knuckles came in. Of course, cutting 14 strips, 2mm wide, and about 30-40mm long is tedious !!

ImageUntitled by Mark Wakelin, on Flickr

There's something askew with the hull as well. The half circle cutout for the mast is in the centre of that thwart, but it isn't over the top of the keel ! Not sure what went wrong, and I don't have any spare work to remake that thwart. Going to have to bodge that slightly.
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Re: Amati Bedford Whaleboat - 1860

Postby Mark » Fri Jul 21, 2017 5:52 am

After the failure of trying to cast new parts for the bow, I settled for making them from wood.

ImageUntitled by Mark Wakelin, on Flickr

The gentle curve of the hull was easy...

ImageUntitled by Mark Wakelin, on Flickr

...but I couldn't get the wood to bend sharply enough at the bow, so those parts were added separately.

ImageUntitled by Mark Wakelin, on Flickr

Doesn't look too bad :D
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Re: Amati Bedford Whaleboat - 1860

Postby Mark » Fri Jul 21, 2017 5:58 am

The reinforcements on the seats have been finished too. They weren't particularly difficult, but a bit tedious.

ImageUntitled by Mark Wakelin, on Flickr

I've updated a few of the recent photos to Flickr, and will do the rest as and when I've got the time and inclination.
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