The Unofficial Mamod and Other Steam Forum

tmuir · Posted: Mon Aug 24, 2009 2:47 pm Post subject:

Now I have the tapping tool Back to the domed nuts.
Due to the small size of them I can't hold them in the jaws of my lathe chuck and my watchmakers lathe doesn't have a tails stock drill so I've got to work backward on my big lathe.

The nut is held in my small chuck that fits in the tail stock and the centre drill is held in the lathe chuck. This is used just to spot the hole so the tapping drill doesn't wonder.

Its then drilled 3.5 to 3.75mm deep with the 2.65mm drill

The thread is started with a 1/8 tap that has just had the point ground off.

Next I used a tap that has all the tip ground off so it will give a complete thread right to the bottom of the blind hole.

That's the captive nuts all finished.

Before I can do any more I need the castings back.
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A nice example of an Australian made Scorpion Donkey Engine

Stilldrillin · Posted: Tue Aug 25, 2009 5:53 am Post subject:

VERY nicely done Tony!

I love that tiny tailstock chuck.....

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tmuir · Posted: Tue Aug 25, 2009 7:15 am Post subject:

Kritika · Posted: Tue Aug 25, 2009 10:38 pm Post subject:

Looking Good Tony

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MooseMan · Posted: Tue Aug 25, 2009 11:11 pm Post subject:

Great idea having a tailstock chuck - I'll have to look into that!
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Dr. Rog · Posted: Mon Sep 07, 2009 6:53 pm Post subject:

tmuir · Posted: Mon Oct 26, 2009 3:08 pm Post subject:

After a bit of a break its time to get back to the roller.
The other week we managed to get a sad Renown vertical to donate it's whistle to the roller.

The decal on this vertical is original and is from the store Levensons Radio which I've found references from the 1930s to the 1960s on the internet so I'm guessing Levensons also sold Renowns and rebadged them with their decals.

Now Steve's roller at some point was modified and the pipe work for the whistle was removed, the hole drilled bigger and fitted with a bush and then a brass bolt.

This is what it should look like.

I had a bit of a struggle to get the bush out and once removed I could see why. It was nearly an inch long and had been installed a long time ago and was covered in calcification.

Material gathered together to make new whistle pipework.

New bush made for the boiler and the pipe test fitted in the bush.
Once I make the top half of the pipework I will most likely need to shorten the pipework by a few mm.

Will hopefully finish this part tomorrow night and then I can give it a test fire.
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A nice example of an Australian made Scorpion Donkey Engine

Les · Posted: Tue Oct 27, 2009 12:09 am Post subject:

It is looking good so far.

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tmuir · Posted: Wed Oct 28, 2009 3:04 pm Post subject:

Just finished making the last parts to be able to put the whistle on the roller and soldered them on.

Tomorrow I'm going to attempt to make some fibre washers to give it the authentic look and then refit it back in the roller body and give it a steam to test my soldering.

I should hopefully have the castings before the weekend and then I can make the large pulley. Then I just need to make the friction drive and its all set to go.
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A nice example of an Australian made Scorpion Donkey Engine

TE1DRIVER · Posted: Wed Oct 28, 2009 3:11 pm Post subject:

Blimey Tony, that's some craftsmanship
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scalex · Posted: Wed Oct 28, 2009 4:10 pm Post subject:

thats looking real good now Tony it will be great to see it finished

Ross · Posted: Wed Oct 28, 2009 4:13 pm Post subject:

Cool!! Great work Tony

Ross
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Sandman · Posted: Wed Oct 28, 2009 4:47 pm Post subject:

Looking good Tony.
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Les · Posted: Wed Oct 28, 2009 5:38 pm Post subject:

That's great.

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Kritika · Posted: Wed Oct 28, 2009 10:18 pm Post subject:

Wow Tony

Sorry I have been in the Middle East for the last 10 days, so I have missed all this.

Wow this is looking so so good, I cant believe the transformation and all the skill you are putting in is awesome to watch.
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