Cutting a round hole in ductwork.
Previously:
Duct crimping tool - GIF
HVAC velometer - photo
Bending a duct elbow to shape - GIF
HVAC duct jack - photo
Duct crimping drill attachment - GIF
Cutting a round hole in ductwork.
Previously:
Duct crimping tool - GIF
HVAC velometer - photo
Bending a duct elbow to shape - GIF
HVAC duct jack - photo
Duct crimping drill attachment - GIF
New plans added on 11/20: Click here for 2,589 plans for homemade tools.
durrelltn (Mar 1, 2022), flyfr8rs (Mar 6, 2022), johncg (Mar 1, 2022), mccwho (Mar 1, 2022), nova_robotics (Mar 5, 2022), Slim-123 (Mar 5, 2022), that_other_guy (Mar 9, 2022)
Is that actually a circle though? At 90 degrees if you project a circle onto a cylinder it approximates an ellipse (if you unroll the cylinder's surface). Other angles make egg shapes. You can probably jam it in there because it's just ducting, but for materials more rigid than dirty old tin this method won't work.
This is a neat website. Give it some parameters and it'll spit out a printable PDF template you can use to cut your pipe.
https://cq.cx/tubejoin.pl
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