Forming pony truck frames

This topic has 3 replies, 2 voices, and was last updated 11 December 2014 at 09:40 by edintheclouds.

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10 December 2014 at 14:20 #7400
edintheclouds
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@edintheclouds
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10 December 2014 at 14:20 #172140
edintheclouds
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@edintheclouds
Hi,

I've been reading about normalising steel before machining, I'm about to make a start on a pair of pony truck frames that have been laser cut.

Should I heat treat (normalise ) the frames as they need two bends/curves formed to make a gentle 'Z' shape to attach the pivot bearing to the loco.

Also would it be worth milling a line few thou. (.010/.020" deep) on the inside of each bend about 1/16" wide to make sure the bends are square to the frames, as the compressed metal will form a bulge and maybe over stretch the outside surface.

Is anyone building or built a SR Mogul 260 'Ashford' by Martin Evans?

Les
10 December 2014 at 18:28 #172160
Michael Topping
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@michaeltopping17870
Les,

Laser cut steel in normally hot rolled pickled and oiled so it will be in the normalised condition as received.

I built an Ashford some years ago when the series was first in the model engineer. Don't remember having any major issues and it was a very good running loco.

Michael
11 December 2014 at 09:40 #172190
edintheclouds
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@edintheclouds
Thanks Michael.
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Forming pony truck frames

Forming pony truck frames

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