Screwdriver
Member
- Messages
- 10,146
Almost finished with the first stage making my first knife. It has issues but I am relatively happy. I still need to chop out a fair bit of weight from the handle but the next step will be heat treating.
So I need to build a burner first and I can use a few bricks to act as a forge/baffle until I get my act in gear and build a proper forge. I settled on this design:
I say "settled for" but I basically made it up based on some similar designs I have seen. Never seen one like this with the concentric feed and built in screw choke but I am determined to make it work!
The gas feed comes through a hollow threaded section which has a MiG tip jet and is positioned to be concentric with the black iron pipe body.
TiG welded a collar onto a bip screw connector and put a flare onto it to act as a sort of "trumpet" inlet for the naturally aspirated air intake.
Well I say "welded" but man, that black iron pipe is dirty stuff. I think it's successfully stuck though .
Finished design looks like this from the top.
Screw thread means I can easily adjust the distance of the gas jet to inlet.
Made up an aluminium choke which (clearly) runs up and down on the thread. The idea is that the airflow is as smooth as possible, whatever the setting.
Next step is to cut the pipe to length and fit a flare, then connect a gas fitting and valve.
Then fire it up!
So I need to build a burner first and I can use a few bricks to act as a forge/baffle until I get my act in gear and build a proper forge. I settled on this design:
I say "settled for" but I basically made it up based on some similar designs I have seen. Never seen one like this with the concentric feed and built in screw choke but I am determined to make it work!
The gas feed comes through a hollow threaded section which has a MiG tip jet and is positioned to be concentric with the black iron pipe body.
TiG welded a collar onto a bip screw connector and put a flare onto it to act as a sort of "trumpet" inlet for the naturally aspirated air intake.
Well I say "welded" but man, that black iron pipe is dirty stuff. I think it's successfully stuck though .
Finished design looks like this from the top.
Screw thread means I can easily adjust the distance of the gas jet to inlet.
Made up an aluminium choke which (clearly) runs up and down on the thread. The idea is that the airflow is as smooth as possible, whatever the setting.
Next step is to cut the pipe to length and fit a flare, then connect a gas fitting and valve.
Then fire it up!