Author Topic: Horizontal Twin  (Read 2756 times)

Offline warrenmaker

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Horizontal Twin
« on: June 24, 2018, 10:31:44 AM »
Since I drew this up myself I decided to start a new thread in here.

This engine is a mix of Muncaster simple horizontal, Victoria twin, and another engine Kieth Appleton showcased on his U tube channel. All thrown in together and I came up with this.


Offline warrenmaker

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Re: Horizontal Twin
« Reply #1 on: June 24, 2018, 10:33:38 AM »
SO... on with the build,

First I started with the cylinders


Offline warrenmaker

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Re: Horizontal Twin
« Reply #2 on: June 24, 2018, 11:05:50 AM »
then the cylinders went onto the mill to machine down the section where I will fit the Valve chest  false bases.

Offline warrenmaker

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Re: Horizontal Twin
« Reply #3 on: June 24, 2018, 11:07:23 AM »
Once I had done that I started on the Valve chest bases.
Thanks to Jason for this great idea.  :NotWorthy:

« Last Edit: June 24, 2018, 03:00:42 PM by warrenmaker »

Offline warrenmaker

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Re: Horizontal Twin
« Reply #4 on: June 24, 2018, 11:08:19 AM »
then flipped them over to cut the passage for the exhaust

Offline warrenmaker

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Re: Horizontal Twin
« Reply #5 on: June 24, 2018, 11:27:03 AM »
The bases for the valve chest are a light press fit onto the cylinders. I have never attempted silver soldering so I am contemplating gluing them down as I don't have a torch of any kind anyway. Not sure on what to do with this yet.

After finishing the bases I machined the end of the cylinders for the steam passages
« Last Edit: June 24, 2018, 03:02:00 PM by warrenmaker »

Offline warrenmaker

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Re: Horizontal Twin
« Reply #6 on: June 24, 2018, 11:40:49 AM »
Next it was onto turning the cylinder covers.
I managed to find a large brass bar at the scrap metal recyclers.
I also made up a female mandrel to turn the register in the reverse sides of the covers and bore the hole for the conrod. This way i could be sure it held its concentricity after being flipped over. Even if the OD of the coveris a few tenths out the bored hole for the conrod will be perfectly concentric with the cylinder register which is the critical match.
« Last Edit: June 24, 2018, 03:08:23 PM by warrenmaker »

Offline warrenmaker

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Re: Horizontal Twin
« Reply #7 on: June 24, 2018, 12:16:21 PM »
The valve chest bases are lightly pressed into the almost finished cylinders.

« Last Edit: June 24, 2018, 03:02:55 PM by warrenmaker »

Offline zeeprogrammer

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Re: Horizontal Twin
« Reply #8 on: June 24, 2018, 02:07:55 PM »
Looking good!  :ThumbsUp:

I'm curious about the female mandrel for holding the cylinder cover. I don't see how it clamps. What stops the cover from spinning in the mandrel?
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
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Offline warrenmaker

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Re: Horizontal Twin
« Reply #9 on: June 24, 2018, 02:50:01 PM »
Hey Zee,

The female mandrel ( for want of a better name), is made .02mm smaller than the cylinder cover and heated with a heat gun for a minute or 2 whilst turning the lathe on lowest speed. This heats the mandrel evenly. Then I use the tail stock  to press the cylinder cover into place which is a slide fit anyway if heated correctly. The mandrel being Aluminium expands extremely rapidly when heated. When it cools it grips the part quite tightly. It really only works well on parts with larger diamaters where the friction fit creates quite a bit of grip. One needs to use an Carbide  insert for Aluminium as they are razor sharp and cut with very little force. They also give a superb finish on brass as can be seen. When finished just slide a pice of Alloy bar through the spindle bore from the rear of the lathe and through a pre drilled hole in the mandrel to tap the cylinder cover out and fit the next one. They are only accurate until you remove them from the chuck though; so they are sort of a one shot wonder. Worked perfectly here though as I had four cylinder covers to do so it made it worth while making.   :ThumbsUp:
« Last Edit: June 24, 2018, 03:09:36 PM by warrenmaker »

Offline zeeprogrammer

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Re: Horizontal Twin
« Reply #10 on: June 24, 2018, 04:51:16 PM »
Thanks! Very interesting.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

 

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