Wednesday, 18 May 2011

Combustion Chamber:- Some Machining Details

While I was away I spent a lot of time looking into the calculations relating to the combustion chamber. These dealt with structural integrity and heat transfer. These musings will be posted in due course. In the meantime here are some details of the combustion chambers' component parts during machining.

This picture shows a combustion chamber flange being bored out, to suit the nominal bore hydraulic pipe forming the chamber inner tube. The flange is made from a section of 304 stainless steel round bar. Concentricity was assured by chucking the part on the central hole to turn and face it to size.

This photograph depicts the flange brought to size. The 3.2mm wide step has been machined. This maintains the spacing between the inner and outer tubes.

Another view of the same part, this time showing the gasket side.

Clean up cuts being made. The edges of the part have been chamfered. The 45 degree chamfer has been generated on the edge of the internal bore, ready for welding the inner tube on.

Here is a section of nominal bore hydraulic pipe being cut on the bandsaw. The tube was then machined to exact size and its edges chamfered to 45 degrees. It was then ready to become the inner tube of the chamber.

Here is the fit up of the inner tube and flange after machining. The next task was to drill and tap the fixing holes in the flange face. The face was drilled and tapped to M6 in 8 positions on a PCD of 62mm. Of course 8 positions means a hole every 45 degrees. I centred and fitted a spare 3 jaw chuck to the rotary table to do this on the mill/drill. Unfortunately I have no pictures of the drilling and tapping operation, but here you can see the rotary table and chuck arrangement fixed to the mill/drill. 

Coming next will be the design calculations for the chamber. Keep watching.

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