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Tractor Frames

Posted by D869 , in Hayle North Quay, Shunting Tractor 28 April 2018 · 617 views

I've been making bits for the shunting tractor for a while now (the one in the video in the previous post is just for testing). For the most part it will be scratchbuilt and it's a bit of a case of making up the plan as I go along... never having built a model of a wheel loader before.

 

The cab sides and engine cover sides have been cut out from two bits of 5 thou brass soldered together... actually they are not yet fully cut out. Somehow I hope to assemble these into a three dimensional thing resembling the real thing.

 

I'd assumed all along that I would do the main frames on the milling machine - the first time I've used the miller to do make a set of frames. I've had the thing drawn in CAD for a long time and decided it was time to bite the bullet and actually see if the theory would work in reality.

 

I didn't really know how this was going to go but I bunged in a 1mm cutter, cranked the spindle speed up to near the max and set to work on two bits of 22 thou brass soldered together. I was half expecting broken cutters but it all went very well. It took me four 'laps', each taking around an hour to get through the thickness, leaving three 'tabs' to make sure the frames stayed put while I was making the last cut.

 

Attached Image
Two 'laps' complete

 

Attached Image
All done. There is just the thinnest film of metal in the bottom of the cut.

 

Of course this would be an ideal job for a CNC machine but mine is of the handraulic variety. Instead I drew the cutter path in CAD , printed it out and then wrote up the coordinates of all of the places where I needed to change direction. I didn't attempt to do the diagonals - they will be finished off with a file.

 

Attached Image
My cutting plan complete with idiot guide to help me remember which way to turn the wheels. The cab sides and engine cover sides are also in shot.

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Smart Alec!!!!

 

Very clever Andy.  I hope (and assume) that you will be bringing the efforts of your endeavours to our meeting tonight!

 

Ian

Should be... although it is not unheard of for me to forget the things I intended to bring.

 

Regards, Andy

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A blog about my own modelling projects (as distinct from the St Ruth group layout) - centered around BR WR circa 1968-1972 and my own minimum space 2mm Scale 2FS layout 'South Yard'

 

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