Coffee Stirrer Bowl archive

Thursday 30 September 2010

Bob Chapman shares this quirky project with us which sees him creating a bowl made from discarded, signed coffee stirrers from the AWGB Seminar

Gallery

The idea for this bowl came when I was demonstrating at the AWGB Seminar at Loughborough University last August. The evening before the seminar began, the members of the organising committee and the presenters had just finished a meal together and the table was strewn with these slim wooden sticks. In a moment of madness, instantly regretted, I suggested that if enough used stirrers could be collected during the seminar, I would convert them into a bowl.

The other presenters immediately wanted to know how I could make a bowl out of these sticks, and in truth I hadn't actually got a clue. "Oh, I'll figure out a way," I said airily, as if I did this sort of thing all the time. Not intending to let me off the hook for want of material, Mike Donovan, an AWGB committee member, took up the challenge with relish and over the next three days organised the collection of what turned out to be 568 coffee stirrers. "What a very nice, helpful man" said my wife, Linda.

I couldn't believe I'd actually said it out loud: I'd offered to turn a bowl out of wooden coffee stirrers and I'd used my outside voice when I thought I was using my inside voice.

Tools used: 3mm (1/8in) parting tool and 13mm (1/2in) bowl gouge

Step 1

For hygiene purposes, put the stirrers in a bucket full of bleach for a couple of hours, then rinse in clean water before allowing them to dry. To form a bowl the stirrers obviously need to be bent to shape. Turn a former from a piece of sycamore (Acer pseudoplatanus) and cut a groove near the top to hold the sticks in place without glue

Step 2

Bend the sticks round the former and use a cone tailstock centre to hold the inner ends in place. Then, glue a second layer of stirrers to the first layer using Cyanoacrylate. Put small drops of glue on the stirrers of the first layer and spray the stirrers to be added with accelerator before pressing them in place

Step 3

Add further stirrers, gluing each one to those underneath. Take care not to glue any of them to the sycamore former

Step 4

Cut and add more coffee stirrers and place them on the outer surface. The gaps will gradually be filled in and it will begin to look more like a bowl exterior. Be aware that the surface may become very uneven and it may get more and more difficult to bend and glue more stirrers securely to the surface

Step 5

To level the surface skim the exterior of the bowl with a 13mm (1/2in) bowl gouge, taking a very light shearing cut with the gouge's lower wing held at approximately 45 degrees. The wood of the stirrers will cut very easily and will leave a surprisingly good surface over most of the bowl

Step 6

Unfortunately, on my attempt, the sticks were only about 1.5m (1/16in) thick and where they stood proud they were completely removed by the gouge, leaving a number of ragged holes in an otherwise level surface. Also, I was far from happy with the appearance where I had cut the stirrers at angles to try to improve the way they fitted together. Cutting off the rounded ends of the sticks had somehow obliterated their identity as coffee stirrers, and the whole point of making the bowl was in danger of being lost. To tidy up the surface another layer of sticks was glued onto the levelled surface, but this time the rounded ends were retained. The bowl was divided into eight sections and the stirrers were glued at an angle over the bowl, forming a sort of 'half-herringbone' pattern

Step 7

Leave the rounded ends on the coffee stirrers as these create quite large voids where the round ends meet a straight side. Fill these with a stiff paste made by mixing fine wood dust with Fastglas polyester resin. The dust is very fine and floury, and sticks to the outside of the paper filter inside dust extractors. Mix the dust with the resin to the desired consistency before adding the hardener

Step 8

And the hardener to the mixture and cover the surface of the bowl. Make sure the filler is pressed firmly into the cracks between the stirrers and that any other gaps are filled slightly proud of the surface. The filler sets quite quickly but I recommend leaving it overnight

Step 9

The resin will set hard but cuts fairly easily with an HSS gouge. Again, skim the exterior to give a smooth and level surface

Step 10

After skimming it became obvious that there were some low spots in the surface which retained a coating of the filler. I decided not to try to take more off the surface for fear of going through the stirrers at their highest points, and so...

Step 11

...yet another layer of stirrers was added. Note: these are laid across those below, giving strength to the construction. As they were being laid on a 'true' surface, this layer of sticks should also be true, allowing them to be the final layer

Step 12

When the stirrers are glued down the ends may overlap the top of the bowl, so these can be cut off with scissors. The top edge will be cleaned up later

Step 13

Fill the surface again, but this time add a couple of spoonfuls of old toner from a laser printer. This will be enough to make the filler black rather than the brownish-red colour obtained by using wood dust only

Step 14

After a final skim with the bowl gouge sand the surface lightly from 120 grit down to 400 grit, then seal and polish. Use a mixture of beeswax and Carnauba wax, but there is no reason why you shouldn't use your own choice of wax, or oil finish, as desired

Step 15

Use a second piece of sycamore as a former for the foot of the bowl. I always think that if the diameter of the foot is about one-third the diameter of the bowl it will look right, so I turned a sycamore former of the correct diameter first. Bend the coffee stirrers around this and glue to it, making sure that each layer overlaps the joints in the layer below. Four layers are sufficient. Fill any gaps as before and clean up the foot before parting through the sycamore to release it from the former

Step 16

Using a 3mm (1/8in) parting tool cut a groove in the bottom of the bowl to take the foot as a close fit. Then, glue in place with Cyanoacrylate, using a piece of scrap plywood and pressure from the tailstock to keep it level while the glue sets. After polishing the foot, the outside of the bowl is complete

Step 17

To work on the inside of the bowl hold it in a vacuum chuck. However, one of the difficulties of using a vacuum chuck is centring the workpiece, and in this case it will take around five minutes of trial and error, and making small adjustments

Step 18

I had hoped to simply pull the sycamore former out of the bowl, leaving the stirrer assembly intact, but it was not to be. Somewhere along the line the Cyanoacrylate must have dribbled down and glued the stirrers to the former. Annoyingly, there seemed no way to remove it in one piece, so it had to be turned away. It was carefully cut back with a bowl gouge to reveal the stirrers on the inside

Step 19

As it happened, once I'd turned the former away to about half its diameter, it came loose and was removed without further turning, revealing the untidy arrangement of coffee stirrers that I'd started with. It occurred to me at this point that if I'd simply glued the stirrers to the former to begin with, I could have done a much neater job and would have been no worse off because I'd had to destroy the former anyway. A wonderful thing, hindsight

Step 20

To have any hope of tidying up the inner surface it would have to be levelled and smoothed with filler. Make a coarse filler, as before, but simply use the coarse dust from the bandsaw, worked in with your fingers

Step 21

Use the cone centre in the tailstock to hold the piece securely on the chuck while turning the pump off and leaving everything to set. Leave overnight, then the next morning turn the pump on and remove the tailstock once the vacuum has gripped the bowl again

Step 22

It took two further layers of stirrers to get a good finish on the bowl interior


Woodworkers Institute

Tagged In:

Bowl , Bob Chapman , AWGB , seminar , coffee , stirrer

Glossary Rollover a term to view its definition

Bowl Gouge , Parting Tool , Tailstock , Scraping , Vacuum Chuck

Handy Hint

1. All the time I had been working on the bowl I had been pondering what to do with the stirrers that people had signed. If I glued them into the final layer, with the names showing, they would simply be lost when I had to skim the surface to get it smooth. Eventually I decided to include them but with the names facing inwards. Thus they are preserved but they will never be seen. The more I think about it the more pleased I am with this idea

Contact Details

Email: bob@bobchapman.co.uk

Diagram Explanation

The diagram shows a plan view of the convex (exterior) and concave (interior) surfaces of the bowl with the coffee stirrers arranged as they are in the final layers. The bowl is divided into eight sections and in each section the sticks are added in the order shown. The two sticks nearest the centre are lined up with the outside edge of the bowl, leaving a gap in the centre. Subsequent sticks are pushed into the corners as they are glued down; they overlap the edge of the bowl and are cut off. The procedure is the same on both the interior and exterior curves of the bowl. Obviously, other designs are possible. The final dimensions of the finished bowl are 245mm (9 3/4in) diameter x 75mm (3in) high. The foot is approximately 100mm (4in) dia. and the wall thickness is a fairly even 10mm (3/8in)

Diagrams Click an image to enlarge