Wednesday, October 3, 2012

Draw bar

 The two components to make the draw bar where made with two identical pieces.The reinforcing rib and bosses around the holes were CNC milled from 7mm flat plate and then each was cut to shape.These were then bent by heating with oxy acetylene .The two pieces were brazed together with a packing piece. All the surfaces were cleaned and fluxed so that the bronze filler rod flowed between the joints.




 The completed bar.




                                                                                                                                                                                                                                                   The pivot bolt has a castellated nut which was machined with a 1.5mm four flute carbide end mill on a Steinel mill drill . The indexing was achieved by clamping the nut in a 25mm tool room vice.