Nice job on the fan discs Rob.... 
Any chance of an explanation on how you did them please? 
Hi John , I screwed the discs to a bit plywood that was fixed to the face plate , turned OD , bored hole , not allot to it
ps. I've read of a few first cupolas which didn't have enough blast to start with, and you may have a cupola extension, too some day, so that bad boy seems like a wise Plan A.
If in doubt give it more clout Steve

I can always throttle it back

Made a start on the tuyere inspection ports this morning , first off I need to make some flanges ,so I burnt a strip of some 10mm plate , this was cut into three and the burnt edges milled up , one 3mm pass each side sorted that .

I made a sheet steel template for marking out and the saw was set over and the lengths of plate were then cut into diamond shapes , the template was then used to mark out the radius's

Then the plate was used as a drill
jig to mark the hole centers.



The four on the left have temp holes drilled into them for fixing to a
fixture for boring , they will be drilled and tapped after welding to tubes .
Time for some lunch me thinks .
Rob