cre8.furniture.v1 · bookcase
Bookcase, 700 × 1800 × 300 mm
Birch plywood with 4 shelves on pins in drilled rows, fixed to the wall at the top. passes its checks
Bookcase takes 20 steps from 5 raw materials: 1 run here, 10 by partners, 9 are bought. The plan makes that 11 here, 0 by partners, 9 bought. 4 inputs are still opaque.
- Mass
- 31.5 kg
- Parts
- 10
- Sheets
- 3
- Router
- 30.2 min
- Test stand
- 2.9 min
- Shipped
- 0.4629 m³, 32.3 kg, two people
Recipe
As recipe text
cre8.furniture.v1 kind=bookcase back=hardboard base_mm=70 depth_mm=300 height_mm=1800 load_kg_per_m=25 material=birch_plywood shelf_support=pins shelves=4 thickness_mm=18 wall_anchor=true width_mm=700
Checks
| Check | Reads | Holds to | |
|---|---|---|---|
| Shelf sag | shelf-1, 664 mm span at 25 kg/m: 0.547 mm at once, 0.985 mm after creep | 1.11 mm; up to 690 mm span or 28.5 kg/m | holds |
| Tipping | Empty tips at 10.2°, 27.9 N at the top; with books tips at 9.66°, 95 N at the top | Anchored to the wall | stands |
| Racking | Held square by the the back | square |
- Stock stiffness, density and creep are typical published figures, not measured on this sheet.
- Creep multiplies the first sag by 1 + k_def, Eurocode 5's factor for indoor use.
- Shelves are taken as simply supported; the back's stiffening is ignored.
- Books load the bottom and every shelf at 25 kg per metre, centred on the shelf's depth.
- The 200 N pull at the top is assumed, not taken from a standard.
- The wall anchor counts as a pass; the anchor and the wall it goes into are not checked.
Cut list
| Part | Qty | Length × width × thickness, mm | Stock |
|---|---|---|---|
| Side | 2 | 1800 × 297 × 18 | Birch plywood |
| Bottom / Top | 2 | 664 × 297 × 18 | Birch plywood |
| Kick rail | 1 | 664 × 70 × 18 | Birch plywood |
| Shelf | 4 | 662 × 297 × 18 | Birch plywood |
| Back | 1 | 1800 × 700 × 3 | Hardboard |
Saw kerf 3 mm.
| Sheet stock | Thickness | Sheets | Used |
|---|---|---|---|
| Birch plywood | 18 mm | 2 | 38.6% |
| Hardboard | 3 mm | 1 | 42.3% |
On the router
3 sheets, 30.2 min of cutting. Edge holes in 5 parts go on the borer, 4.9 min.
Assembly
At the factory
15 steps, 17 min on the clock, 17 min of work.
| # | Step | Tool | People | Time |
|---|---|---|---|---|
| 1 | Lay the left side outer face down on the bench. | hands | 1 | 20 s |
| 2 | Glue the end of the bottom and stand it on the left side at its line. | glue | 1 | 35 s |
| 3 | Glue the end of the top and stand it on the left side at its line. | glue | 1 | 35 s |
| 4 | Glue the end of the kick rail and stand it on the left side at its line. | glue | 1 | 35 s |
| 5 | Glue the free ends and lay the right side on them. | glue | 1 | 1.1 min |
| 6 | Drive 8 × 4 mm wood screws through the right side into the bottom, the top and the kick rail. | driver | 1 | 1.1 min |
| 7 | Turn the case onto its right side. | hands | 1 | 30 s |
| 8 | Drive 8 × 4 mm wood screws through the left side into the bottom, the top and the kick rail. | driver | 1 | 1.1 min |
| 9 | Turn the case face down. | hands | 1 | 30 s |
| 10 | Measure both diagonals and rack the case until they agree. | tape measure | 1 | 1 min |
| 11 | Lay the back on, its edges flush with the sides, top and bottom. | hands | 1 | 20 s |
| 12 | Drive 38 × 25 mm panel nails through the back into the left side, the right side, the bottom and the top. | nail gun | 1 | 2.5 min |
| 13 | Stand the case up. | hands | 1 | 30 s |
| 14 | Set the loose shelves, the bag of shelf pins and the wall bracket inside the case. | hands | 1 | 3 min |
| 15 | Block the corners and wrap the case standing. | stretch film | 1 | 3 min |
At home
7 steps, 9.3 min on the clock, 9.3 min of work.
| # | Step | Tool | People | Time |
|---|---|---|---|---|
| 1 | Unwrap the case where it will stand and lift out the loose shelves, the bag of shelf pins and the wall bracket. | hands | 1 | 2 min |
| 2 | Push 16 shelf pins into the marked holes, level in pairs. | hands | 1 | 1.3 min |
| 3 | Lower shelf 1 onto its pins. | hands | 1 | 15 s |
| 4 | Lower shelf 2 onto its pins. | hands | 1 | 15 s |
| 5 | Lower shelf 3 onto its pins. | hands | 1 | 15 s |
| 6 | Lower shelf 4 onto its pins. | hands | 1 | 15 s |
| 7 | Screw the anti-tip bracket to the top and to a stud or plug in the wall behind it. | drill | 1 | 5 min |
On the test stand
can pass 2.9 min on the stand.
| Gauge | Target | Within | Time |
|---|---|---|---|
| Weigh the unit as it ships: 32.32 kg, within 0.03 kg so that a missing piece shows. | 32.32 kg | ± 0.031 kg | 30 s |
| Tape the packed length: 740 mm. | 740 mm | ± 5 mm | 15 s |
| Tape the packed width: 340 mm. | 340 mm | ± 5 mm | 15 s |
| Tape the packed height: 1840 mm. | 1840 mm | ± 5 mm | 15 s |
| Tape both front diagonals through the wrap, about 1931 mm each; they differ by no more than 2 mm. | 0 mm | ± 2 mm | 40 s |
The targets come from the design; a case passes only if its design checks pass. Nothing here was measured.
Shipping
- Size
- 740 × 340 × 1840 mm
- Volume
- 0.4629 m³
- Mass
- 32.3 kg, 0.603 kg of it packaging
- Handling
- Two people
Made from
The longest chain is 6 steps; 0 of 11 made pieces have a published plan. The graph is make:bookcase.
| Material | Per bookcase | From |
|---|---|---|
| Birch peeler logs | 182 kg | grown: birch, felled and bucked to peeler blocks, green |
| Pine pulpwood | 17.4 kg | grown: plantation pine thinnings and tops, green |
| Iron ore | 283 g | mined: hematite ore, about 62 % Fe |
| Coal | 103 g | mined: bituminous coal |
| Limestone | 44.2 g | quarried: limestone |
| Steel scrap | 52 g | recovered: collected: sorted steel scrap |
Where buying starts
- Press birch plywood, 18 mm
- Press hardboard, 3 mm
- Head, roll and plate fasteners
Still opaque
| Input | Per bookcase | What is missing |
|---|---|---|
| Urea-formaldehyde resin | 4.37 kg | urea and formaldehyde from natural gas; the chemistry is not drawn yet |
| Stretch film and corner blocks | 603 g | linear low-density polyethylene from ethylene; the chemistry is not drawn yet |
| PVA wood glue | 24 g | polyvinyl acetate from ethylene and acetic acid; the chemistry is not drawn yet |
| Zinc plating | 1.8 g | zinc and passivate chemistry; the zinc's mine is not drawn yet |
Who makes it
Today 1 steps run here, 10 by partners and 9 are bought. The plan runs 11 here, 0 by partners and buys 9.
Machines here: assembly bench, cnc router. Partner capabilities wanted: none. Each part takes its share of its sheets by area, so the offcuts are charged to the parts cut beside them. Hardware is counted from the fixings: three glued wood screws at each end of a fixed panel (two at the kick rail), four pins under each loose shelf and a nail every 150 mm along the back's seams. Sheets are charged as the panel saw nests them today; the router's nest leaves room for its bit and takes 3 sheets. Router time is each program's feed and rapid moves at their programmed rates plus tool changes; the boring station takes 20 s a part and 6 s a hole; hand steps are typical times, not measured. Edge banding and a finish are not in the recipe yet, so neither is drawn. Standard chains use typical published yields and loadings, rounded; none is measured on a line this network runs.
In CRE8 VIRTUAL, plant floor opens the plant in front of you; plant load bookcase builds it on the plant floor; plant play runs the clock. The scenes play the default bookcase.