This is Steamworx, a Model Engineering channel.

This is a sixth in a series of basic Model Engineering tools that are easily made in the workshop, and general model engineering practice.

Sometimes a machining setup needs a little thinking out of the box. This was the case when I needed to machine two faces parallel to one another and perpendicular to the bore of an uneven casting. Repositioning the casting and lining everything up true would be almost impossible. The solution was to make an expanding mandrel to use the bore as the common surface to machine to.

Expanding mandrels are commercially available but their construction is not always suitable to the job in hand. In this case I needed rigidity, access to the machining area and the ability to swap parts without setting up all over again. The solution is quite simple and relatively straight forward to make in the home workshop. Hopefully this idea will inspire many uses and save some head scratching in the future.

I hope you approve!

Please comment and subscribe, let me know what you think or would like to see!Enjoy!If you are interested in 2 ½” gauge locos please visit ‘The National 2½" Gauge Association’ at [ Ссылка ] or the Guage 3 society at [ Ссылка ] for Dyak and many other locos available from Kennions at [ Ссылка ]

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