have I missed something here?

Ron has shown one of my album pics which is a simple test of concentricity of drilling for in this case a new steam cone with the lathe running and the drill in the drilled hole absolutely true. Probably a 1mm drill.

The particular problem with Ron's commercially recently bought injectors from reputable ME commercial suppliers is quite simply that they are 'crap' and wont work as sold. That is a damning indictment on the current rubbish peddled by the trade, except for one supplier namely Pavioursteam (usual disclaimer).

Ron is not alone in this respect as I have previously been sent 4 of these examples to try and rectify prior to Ron's 2 examples, and in each case I have told the unfortunate buyers that they are 'bin jobs' and not worth the effort to rectify if indeed this was a realistic prospect. I have been sent a further example today from Australia but bought in the UK. The one of this type that I did try and sort out created a great deal of work in time and effort that on test was as expected very poor performance wise and although worked in a fashion was not to the sort of standard I would regard as acceptable.

The particular problem with these injectors is the very poor combining cones. As per Derek Brown, if new combining cones are required it is a 'bin job' and not worth the effort for us amateurs. I dont mind making new steam cones and delivery cones to someone else's injectors but making new combining cones to fit into a foreign body is fraught with problems and usually unsuccessful.

Cheers,

Julian

Edited By julian atkins on 13/06/2017 23:56:48

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I think it safe to say that injectors present an ideal task for analogue machining.

MichaelG.