Setting out the hole positions for the 18 injectors , 11 holes per injector , 3 large and 8 small , 198 holes allup , with centre punch in the mill chuck , turn the number of degrees and mark the hole
I left the front wall on the die after rolling the edges , both rolled cold , but the outer edge then heated with the oxy and rerolled , the stainless then contracts when it cools and locks the wall to the die and the "springback" of the rolling is removed so I end up with a better edge .
Then it was time to drill holes, 2 mm cobalt drill to start with , then open up the 18 X 3 hole sets of 4.7mm dia holes , and countersink all 198 holes on both sides ,
I always like to take off any sharp edges and leave the holes as they should be, hopefully the rest of the flametube goes as well , really need to start thinking about the NGV so that I can make the rear walls , the side walls will have to wait until I can get an accurate size for the available space between diffuser and NGV .
Don't really know , maybe some sort of locking device for the comp in its original use , I haven't the faintest idea what the wheel is out of , it was just a "Part Number" in their list of wheels they make , it was the right size so went with it .
Post by dieselguy86 on Jun 6, 2021 23:13:03 GMT -5
Now that you say that, the tractor pullers here use 2 holes and dowels in the comp nut. Apparently they are spinning comps on the shaft, they first tried keying the comp to the shaft, but it required alot of balancing to correct. So they settled on the dowel pin idea.