Here are some shots of the making of a Philadelphia style screw tip horn.
The firsts show the starting point.
Next was to measure and cut the tip.
Drilling into the body cavity
And enlarging that hole to 17/32nds for taping. I put a stop on the bit to keep it from chasing the ¼” hole any farther than I wanted it to. Also putting a hose clamp around the horn at this point will help keep it from splitting, leave it on for the next step also, you may have to fit the clamp to keep it from sliding.
Here you can see a 5/8-11 bolt screwed in. Didn’t get pics of tapping but it is pretty straight forward, just go slow, maybe ½ to ¾ turn and back out a qtr or so, I used Dr. Jackson’s Hide Rejuvenator as a lube. The stuff works great on dry hands too.
Next up the collar, the start.
Rough shaped and ready to drill. Above, where the bolt is screwed in, I shaped the very end of the horn down to about ¾”, just so it would almost fit in a ¾” hole. I used ¾, it could have been larger or smaller depending on the collar/tip size and shape.
Chucked up and drilled.
Here it just barely fits on the tip
The collar needs to be opened up so it fits the horn. Back in the chuck takes some off and then a finial fitting using transfer color. A tapered pipe reamer helps here. You may have to go back and forth to get it close. I wait until the tip is turned and final fit the collar and tip together.
It is close enough that it can go back in the chuck and get shaped.
Close here.
The area where the collar will be it taped off while the rest of the horn is roughed shaped.
I hope this is understandable. Pt II tomorrow.
Tim C.