Threaded Dust Extraction Hose Fitting
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Adapter to connect 1.5in (~44mm) wire-reinforced dust extraction hose to 2in (~51mm) shop vacuum cleaner port.
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Fitting used to connect my 1.5inch compound mitre saw hose to 2inch vacuum port.
Purchased a 1.5inch wire-reinforced hose from a local supplier (https://www.timbecon.com.au/dust-hose-1-1-2in-x-3m-length) and needed a way to firmly connect it to my shop vacuum.
This fitting was designed with a reverse thread to firmly screw onto the wire-reinforced hose and a sloped ID at the other end to create a friction-fit to the 2inch shop vacuum port. The threaded side has a flange to act as a hose stop.
The pitch of the wire reinforcing the hose is 0.5in/12.8mm per revolution, but the internal thread should accommodate some variation in manufacturer tolerances in similar types of hoses.
In non-Freedom Units, the wire-reinforced hose OD is approximately 44mm, and the other side ID is 52mm which narrows to approximately 50mm to ensure a good friction fit.
I printed this without any supports with the threaded end (narrowest ID) facing upwards.