The adapter for an old Electrolux crevice tool (not the dust brush) snapped at the usual stress concentration after about three years:
Crevice tool adapter – broken vs PVC pipe
The lower adapter is the new version, made from a length of 1 inch PVC pipe (that’s the ID, kinda-sorta) epoxied into a revised Kenmore adapter fitting.
The original OpenSCAD model provided the taper dimensions:
Electrolux Crevice Tool Adapter – PVC taper doodles
The taper isn’t quite as critical as it seems, because the crevice tool is an ancient molded plastic part, but a smidge over half a degree seemed like a good target.
Start by boring out the pipe ID until it’s Big Enough (or, equally, the walls aren’t Scary Thin) at 28 mm:
Crevice tool adapter – boring PVC
Alas, the mini-lathe’s craptastic compound has 2° graduations:
Minilathe compound angle scale
So I set the angle using a somewhat less craptastic protractor and angle gauge:
Crevice tool adapter – compound angle
The little wedge of daylight near the gauge pivot is the difference between the normal perpendicular-to-the-spindle axis setting and half-a-degree-ish.
Turning PVC produces remarkably tenacious swarf:
Crevice tool adapter – PVC swarf
The gash along the top comes from a utility knife; just pulling the swarf off didn’t work well at all.
The column of figures down the right side of the doodles shows successive approximations to the target angle, mostly achieved by percussive adjustment, eventually converging to about the right taper with the proper dimensions.
Cutting off the finished product with the (newly angled) cutoff bit:
Crevice tool adapter – cutoff
And then It Just Worked™.
The OpenSCAD source code for all the adapters as a GitHub Gist:
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