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Author Topic: BB 18¼ Steam Loco Chassis  (Read 4104 times)

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BB 18¼ Steam Loco Chassis
« on: July 24, 2013, 07:04:03 AM »

The most complex part I have milled to date. 

A model train enthusiast approached me with his Autocad Sketch of a 1/16 Scale model of a Queensland Rail Steam Locomotive Type BB 18¼ . (The pistons were 18¼” Diameter).  As I understand it, this loco was the last steam loco produced for Queensland Rail before the era of diesel locos. A couple of YouTube videos here:



I had to create a 3D model of his drawings so I could program the part using HSMXpress. All 4 sides had to be machined with many processes.  I ended up creating 4 datums, one for each side so I could use the same reference point the LH side of the fixed jaw on my milling vice as I rotated the material.

I proved out my programming with a first off in Aluminium before switching to the final brass material.

The attached pics show the Solidworks 3D Model, then a couple of views of the completed chassis as it came off my X3 Mill.

I miss the age of steam!!  Enjoy
Re: BB 18¼ Steam Loco Chassis
« Reply #1 on: September 15, 2013, 03:47:07 PM »
I miss the age of steam!!  Enjoy
If these insane fuel prices continue, the age of Steam may not be over yet! I have been working on my first Steam Wobbler engine, but did not succeed in aligning the cylinder walls in a straight line of travel in relation to the packer box. Causing it to seize at a certain point of travel. So a new casting will be neccessary. I just haven't gotten around to doing it (yet). This summer's grass-growing season hasn't let up much! So it will probably be a winter project.