Potty Grasshopper Engine

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sbwhart:
Hi

I see you old madmodders are awake then :lol:

Ok on with the con rod I made this from 1/2" Squ mild steel

First job was to cut a length off and square it off in the lathe using a 4 jaw self cantering chuck, then I blued it up and marked out the key features.

Then drilled 8mm holes where the bearing bushes will fit.

Centred both ends and machined a 6mm register to help mill the flats in the middle when I come to them.

Then supporting one end with a running centre rough out the key points with a parting tool.

And rough out one end of the shape.

Swop it round and rough out the other end.

Slew the compound round 1 1/2 deg and machine the taper with a round nose tool.

Flip it round and taper the other end a shape the fat belly in the middle, and polish up with a bit of emery.

Mill the ends to thick ness maling use of the register when the cut just kisses it where down to size.

Shape the end with some filing buttons

Give it a polish and fit the bearings.

While I was at it made the cross head.

Her they are fitted on the beam.

And her's the beam with the cylinder.

Stew

sbwhart:

--- Quote from: Chuck in E. TN on September 11, 2015, 08:21:27 AM ---Me too, Stew!
Is there a list anywhere of your engines that use the same cylinder? I intend to build them all.

Chuck

--- End quote ---

Hi Chuck there will be three in total:-

The mill engine http://madmodder.net/index.php/topic,8438.msg90828.html#msg90828

The Vertical engine http://madmodder.net/index.php/topic,9371.msg103716.html#msg103716

And this grasshopper.

Thanks for your interest.

Stew

Chuck in E. TN:
Thanks, Stew.

Chuck

sbwhart:
On with the swing beam.

I've long admired the iron work of a beam engine that runs at Style Mill Cheshire, it roughly of the same date as the grasshopper I'm styling this model on. the Iron work on this engine is based round the them of interlocking circle's so I thought I would try and make this beam a series of interlocking circles.

First job turn a length of bar down and mark the part off points of each circle.

Then transfer over to the spin indexer and mill two flats down either side, and drill each side 1/16".

Then back over onto the lathe and drill out.

And then part off each circle.

Link the circles together with a 1/16 rod

And silver solder together.

Then mill two more flats on each side.

And drill some 1/6" to take some 1/16 rivets to hold the side arms in place, then soft solder the lot together.

Drill the pivot hole through both sides.

And clean up its going to get a lick of paint so it doesn't need a shine.

This is it mocked up in place for a look see.

Stew

Chuck in E. TN:
:jaw: Stew, I am in awe of your talents! :beer:

Chuck

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