To see how I installed the CEROS transformer on my Festool CT26 dust extractor, click here.
This article shows how to layout and carve threads in a rubber hose end-piece. However, the same techniques can be used to carve male threads in wood or another material.
The Mirka CEROS (Compact Electric Random Orbit Sander) has a dust extraction port with internal threads that screw directly onto the end of a Festool 27mm hose to prevent it from dislodging accidentally. However, that means the tapered rubber connector on the end of the hose needs to be removed. This is not a difficult procedure but it is not something I want to do every time I switch between the sander and another tool.
I know of four solutions to avoid having to install or remove the connector when using it with the CEROS:
- Jam the connector in and hope it stays;
- Buy another hose and dedicate it to the CEROS;
- Make an adapter using a short length of 27mm hose and some fittings; or
- Cut threads on the connector.
Tired of fighting to get it to stay connected with just a press-fit, I decided to carve threads on the adapter to secure it into the port. I used two carving tools, a rule (double square) and black electrical tape.
Next, I used a V-shaped carving gouge (#12 sweep, 2mm wide) along the edges of the tape to transfer the layout lines through to the connector. Then I peeled off the tape so I could better see the V-cuts.
Following the V-cuts, I used a veining tool (#11 sweep, 3mm wide) to cut the threads.
Finally, I tried to thread the connector into the port. When simply press fit, there was 7/8″ of exposed connector between the first shoulder and port.
Once threaded in fully, only 1/2″ of the connector was exposed between the first shoulder and port. The threads mated very well and there was no chance of the hose disconnecting accidentally. And I was able to still use the hose with other tools without a problem.