2016-03-22 (Tu) Drip Coffee Maker

After making a hole with a brass tube in the neoprene stopper it was necessary to shorten the tube so it would not interfere with the rest of the coffee maker parts, particularly those below the water bulb (vase). The stopper was placed in the bulb securely and the tube was pushed down so it was held a few millimeters from the far end of the bulb. When the bulb is placed in the coffee maker, with the opening down, this will maintain a small gap.

Breather tube before trimming

Breather tube at bottom of bowl

With the gap established a line was drawn on the brass tube to designate where it would be cut. This line could have been drawn flush with the stopper but it was decided to have it extend as far as the valve for purely aesthetic reasons. A small pipe cutter was used to cut the tube to the desired length which produced a nice end. The cut end was situated inside the bulb so any sharp edges from the cut would not be accessible.

Marking a spot level with the valve

Cut tube end

Tube installed with bulb

Below the water bulb will be a cylinder to hold and filter coffee grounds. Most drip coffee makers have a wide basin for catching the dripping water. It was hypothesized that having a tall slender receptacle for the coffee would keep water in contact with coffee grounds for longer and therefore make stronger coffee. A coffee holder was constructed with a 2" brass coupler, four #99 O-rings, a black 1 1/2" smooth to threaded adapter and a threaded cap.

#99 O-rings. Four of them

Brass coupler, O-rings, and PVC parts

O-rings. Four of them

O-rings were put over the smooth end of the PVC adapter to make a seal between the copper and the plastic part. Four were used to make a strong seal and build up the seals from the middle of the adapter. Each O-ring required some effort to place it on the PVC adapter. When tested with the copper coupler they fit securely. The O-rings may slide off the PVC adapter when removed from the brass coupler but can be replaced the same way they were installed.

O-rings placed on PVC adapter

Coupler resting at and angle on the PVC adapter and O-rings

To do:
  • Build stand
  • Build cylindrical coffee holder
  • Mount coffee holder
  • Add filter
  • Build base
  • Design and build water jar holder
  • Add tube for water jar to prevent vacuum

The rest of the posts for this project have been arranged by date.

First time here?

Completed projects from year 1.
Completed projects from year 2

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2015-08-03 (M)