ATOMATIC 5
5cc ITALIAN BEAUTY
Part three - Bad Day! - by Ramon Wilson
ATOMATIC 5
5cc ITALIAN BEAUTY
Part three - Bad Day! - by Ramon Wilson
Next stage was to turn up an expanding mandrel and mount the 'closed' case on, to bore out for the backplate. At this stage it still has .5mm to come out before screwcutting. The rear face was skimmed, too, to bring it exactly square to the bore ready for the next op on the case.
This first one went well so a change of the change wheels back to fine feed and it was time for the second one. The bore diameters incidentally were done to the same plug gauge as the cylinder heads.
Another change of wheels and the last screw cutting. This went just as well as the first until trying the head on. The thread was a little tight so it was gently chased trying the head, the fit improving each time. Constantly aware of the possibility of the ali 'picking up' this was done quite gingerly until, with a slight tightening with less than half a mil to go I felt it grab! It was at this point with a rapidly deepening sick feeling that I knew this was not going to be my day and kicked myself for not using some tallow that I had thought about doing earlier but overlooked. Some releasing fluid was squirted over in the hope it would penetrate and the head gripped with emery to gain a good purchase. Very tight it moved about half a turn. To improve the grip anti-slip matting was then tried - then heating it - then, in desperation, a pair of chain grips used - the only thing achieved was to undo the face plate. Reality dawned - it was well and truly stuck - big time - so for the first time, though I've read and heard about it, I could quickly see that the only way out was to turn it off. (Expletive deleted, as they say).
The OD was cut back using a parting tool then parted off to leave the 'ring' ...
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