Building a 31/2" Gauge Locomotive Engine

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sbwhart:
Hi Chaps

Tried resizing photos already posted but no mater what I did they ended up the same size

So here we go with the again:-

The excentrics were made from a 30mm dia cunk of mild steel they were turned up all together, and the off set hole set up by simply putting a piece of packing the correct size between a jaw and the work in the three Jaw chuck, the hole was drilled and reamed and the slices of excentric parted off making a few spare, I also retaining a piece of the finished bar to act as a gauge when I bored the sheeves:- Sorry no photos of this as I forgot to take them :hammer:

The sheeves are made from phos bronze castings. The first job was to drill the castings for the clamping holes, then cut them in half, after cleaning the cut face up, the bottome half was tapped 6BA the top half opened up as clearance

The two halves were then clamped together:- Tip a small bush turned up the finished width of the excentric used as a washer, so that when you skim the excentric to width you leave a witness mark on the bush this way the holes will be in the midle, and sheeve the will outomaticaly be the correct width.

Set the sheeve up in the four jaw and bore out to a nice fit on the gauge. Then skim to width you can do this eather in the four jaw or set the piece you used as a gauge in the three jaw and tighten the sheeve on this using a piece of paper as packing.

sbwhart:
Connecting rods

The connecting rods are made from mild steel, the first job was to mark out one rod, then to drill the little ends and to clamp the two rods together using this hole. With the two rods clamped together the rods were milled out.

The big end clamping bolt holes were drilled out with the rod set up on an angle plate,

The big end caps were then cut off the rod, the cut face cleaned up and the hole in the cap opened out as clearance and the holes in the rod tapped 6BA, the caps were then screwed back onto the rods, and the hole for the big end bearing drilled out. The big end bearing is made from phosphore bronze, as this is a split bearing two chunk of material was milled in half, the two halves soldered together, and set up in the four jaw with the split on the centre, and the bearing turned, heating it up released the two halves. The little end bearing is just a plain bush held in place with high strength loctite.

Completed crank axle

bogstandard:
Pictures are perfect size Stew, and the article is coming along nicely.

John

Bernd:
Yup, the pics are great, 640 X 480 pixels, perfect.

Nice job on getting all the hardware between the frame. It'd be interesting to see that in motion.

Bernd

Divided he ad:
Hi Stew,

Now since our brief (but fun) meeting at Boggies on friday I've been waiting for a post on the finished loco.... Only kiddin' :bugeye: just the cylinder :thumbup:

I've got to say it here too... Your a brave man for taking on such a build, not just the complexities more the dedication :bow:

Looking forward to seeing it take shape as are a lot of people I think?

Ralph.

Oh and.....

Bernd....
--- Quote ---Yup, the pics are great, 640 X 480 pixels, perfect.
--- End quote ---
Does this mean my posts are too big??

I don't know if I could go about re-sizing everything.... That would take ages!! :lol:

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