T h e M a rta stool assignment Gabrielle Patterson s3785730 Design prototyping: GRAP1052
A e s t h e t i c s o f Ta r g e t M a r k e t Characteristics idividuals between the ages of 20-30
finalising studies or have embarked upon professional careers low to medium socio economic background usually renters of either small town houses or apartments live in relativly small quaters- so stool needs to accomadate this by being discreet and/or deconstructable attracted to a simple- raw style of furnishing that is quite contemporary in their spare time the audience may be visiting local cafes, art galleris, reading or going for relaxed strolls
Fo r m S t u dy & P r e c e d e n t s
co n t e x t s t u dy
Aesthetic- Joining & Processes
i d e a g e n e r at i o n - i n t i a l s k e tc h e s
i d e a g e n e r at i o n - i n t i a l s k e tc h e s
wo o d j o i n t s - p r otot y p e d
Half-blind Lap
Dove Tail Join
Tongued Trench
Mortise & Tenon Joint
Keyed Mitre
Half Lap
Dado
Finger Joint
Carcase Pinned Joint
Corner Joint
i d e a g e n e r at i o n - I n i t i a l P r otot y p e s all bieces were cut from a board that was scaled to the dimensions of the final piece of wood, therefor it is known that the amount of material used in each deigh is feasible for the material restriction in the brief.
co n c e pt - f u rt h e r s k e tc h e s
co n c e pt d e v e lo p m e n t - f u rt h e r P r otot y p e s chosen design to pursue, resons being; - the structure is quite sound by comparrison to the other designs - the dynamic aesthetic and contrsast of curved and geometric lines works well to target the intended audience.
moivinbg forawrd things to improve include - reducing the amount of twist in the base of the structure - chainging the joinery to be more supportive.
Co n c e pt d e v e l p o m e n t - e x p lo r i n g / r e f i n i n g s t r u c t u r e
Co n c e pt d e v e l p o m e n t - e x p lo r i n g / r e f i n i n g s t r u c t u r e In an attempt to reduce twist in the the base of the structure i projected a bar along the base of the structure, This aimed at giving the stoll a greater point of contact with the ground and therfor hopefully resulting in more stability. However this was not the case with the structure not being able to stand alone, let alone a reductiion in twist,
In this design, I made it a half blind rather than fully through and brought the through aspect of the joint in away from the edge. This aimed to give the seat of the stool a greater surface area to rest upon therefor increasing the stabilty of where one would sit. Also by locating the through part of the joint more centrally this increase the stablity of the leg structure.
Co n c e pt d e v e l p o m e n t - e x p lo r i n g / r e f i n i n g s t r u c t u r e By flippin the front leg upside down I aimed to increase stabiltiy as this provides the stool three points of contavt with the ground. This definitly increased the stabilty of the design but the long leg along the base still does gove the design a bit of sway.
By removing the long leg along the base and therefor having less surface contact with the ground, this design, somewhat paradoxically (to the theory that increased surface area results in greater stabilty) this design is a lot more stable. The three points of the base which are orientated in a triangular format gives the seat of the stool a stable and strong supporting structure.
co n c e pt d e v e lo p m e n t - 1 : 1 d r aw i n g scaled down for this document*
The size of the sheet, will be the size og the piece opf ply, therefore it is feasible that all the pieces of the stool will fit on the ply there by abiding by the material restriction of the brief
I squaere off the joints instead of having them angled, because in the construction process the will be easier and more accurate to produce.
added a corner joint, that did not appear in the 1:5 model, in the hope that it would increase stregth of base and reduce twist of structure
co n c e pt d e v e lo p m e n t - 1 : 1 m o d e l
I cut all the slots to a width of 9 mm, as this will be required for the wood, however this is slightly too big for the cardboard. As a result, the pieces do not fot tightly togteher.
From prototyping from cardboard, this design should be structurally viable to be construc tured from ply, if a few adjustments are made first. This led to two main isses. - firstly the the leg pieces were sliding through too much, meaning that the top was not flush - secondly the legs had a lot of movement.
These include - reducing the size of the circular top- was slightly too big to sit centrally and have knees flared, as the diamtre would not allow leg movement past a certain point. - Increasing the length of ther corner joint so that it is 1:1 of cut away :material. This should increase the strgth of the structure.
To get a better idea of the strength of thr structure, we insered papper into the joints so they fit mkore tightly together. From this it was encouraging to see the twist in the legs reduces significantly and the overall stabiltiy of the structure was more appropriate for its purpose.
R e f i n e m e n t - 1 : 1 d r aw i n g scaled down for this document* I also increased the length of the corner joint so it is a 1:1 ration which will increase conatct area and therfor strength of this joint
I readjusted the orientation of the of the legs so they length of both legs runs in the same direction. This means I want a piece of ply with the grain running down the short length as this means the grain will run vertically down the legs, providing more stregth to the base structure.
REV No. -
REVISION NOTE
DATE
DRAWN
-
-
-
CHECKED -
100
9
60
100
60
500
110
9
9
310
W
191
110 396
440
120
0
44
DESIGNED
G PATTERSON DRAWN
PSC
DATE
DWG TITLE
SCALE
PROJECT
20/04/19 1:10
CHECKED
TOLERANCES LINEAR +/- 0.5mm INDUSTRIAL DESIGN ANGULAR +/- 0.5° SHEET No. GRAP1052 TECHNOLOGY 4 ALL DIMENSIONS IN MILLIMETRES UNLESS NOTED OTHERWISE. 1 OF
SOLIDWORKS Educational Product. For Instructional Use Only.
DWG No.
1
REVISION
A
SHEET SIZE
A3
FILE NAME
GA- STOOL GRAP1052-STOOL 1
ORTHOGRAPHIC: STOOL
REV No. -
440
60 60
200
60
REVISION NOTE
DATE
DRAWN
-
-
-
CHECKED
60
500
9
9
9 9
60
PART 1: P-SHAPE STOOL BASE
440
9
60
W
60
PART 3: STOOL TOP/SEAT
360
66
66
9
60
500
9
110 396
DESIGNED
G.PATTERSON DRAWN
G.PATTERSON
PART 2: V-SHAPE STOOL BASE INDUSTRIAL DESIGN GRAP1052 TECHNOLOGY 4
SOLIDWORKS Educational Product. For Instructional Use Only.
CHECKED TOLERANCES LINEAR +/- 0.5mm ANGULAR +/- 0.5° SHEET No. ALL DIMENSIONS IN MILLIMETRES UNLESS NOTED OTHERWISE.
1 OF 1
DATE
DWG TITLE
SCALE
PROJECT
21/04/19 1:10
DWG No.
REVISION
A
SHEET SIZE
A3
FILE NAME
PARTS- STOOL GRAP1052-STOOL 2
ORTHOGRAPHIC: PARTS
-
Refinement- Final Rendering
The process The process began by printing off the 1:1 sketch of drawing of the stool and transfering it across to the piece of timber
The cutting process becan with the circle. I but a square with a slightly larger width and length than the cirle diametre. The reason for maintaing the sqaure endge is so that there was still a reference for the router table to cut the slots through the piece. firstly i drilled several holes with the drill press along whther the slot would be and then the techs helped my using the router to cut along the sides of the slot.
To cut the circular shape I intially used the bandsaw to cut a roungh outline of the circle. Then it was a matter of using my large piece of wood and measuring the radius of the circle from the edge, and placing a nail at this distance
I put a half cole in the base of the circle so it could rest on the nail and then I clamped the large piece of wood to the disc sander. This allowed me to rotate the circle as the sander operated resulting and an uniform radius.
The process Then it was a matter of sanding back the joints I used both dand paper, sanper attached to off cuts and wood files to achieve this.
The process To remove the excess i used the drill press. To make the joins in the leg pieces I used the bandsaw to cut the verticle lines, and then again i used the drill press to remove the horizontal component.
I started both leg components by cutting majority with the varga saw. I contemplated using a jigsaw with a rig set up to ensure straight lines, however I was told that by doing majoity with the varga and the small details with the jigsaw i would get a cleaner, neater finish.
The process
With the other leg, (as mentioned before) the majority of the shape was cut with varga saw, I did all the details of the joinery with the band saw
Lastly the the joints just had to be sanded back to finish them off. I secured the pieces in the vice and tried to use smoothe sweeping motions to achieve squared off edges.
As this joint cut out section was located centrally again I drilled down the piece and removed the excess horizontal component with the drill press
The process
Then it was a matter of sanding back the joints until all the parts locked togther well. photos depict the before shots, where parts were all slighhtly to large. After it the interior parts had been hand sanded, I set about sanding the flat surfaces, using the orbital sanding. This process involved three layers of sanding. Starting with 150 to 240 and then to 320.
The process
I sanded using 320 grit sand paper in between coats
The last part of the process was the finish. I began by using a roller to apply the first coat.
I applied the second coat using the brush, I found it gave me more control and more of an even finish. I finalised the stool doing a light sand just to give the wood a velvet like, even touch
s to o l i n U s e
E va luat i o n The completed stool is designed to be a multi-purpose, decontructable/ flatpack design. With a combination of geometric and curved lines, the overall aesthetic is one that is contemporary and quite dynamic. The i dea of the stool is that one could have the flat- pack form of the stool sitting in the cupboard or in a bag to transport it places then they could easily contruct whenever and whereever they desired. The overall process to produce this prototype took 2.5 weeks, however if to be manufactured in industry it would be a much quicker process as all pieces are straight cut outs, therfore a CNC could produce the parts far more acuratly and efficently. While I am pleased with the finished look of the design, I am slightly dissapointed with the stabilty of the structure. The base of the stool has a lot of twist to which makes for a nervy (potentially, slightly fun) user experience as it does not feel terribly stable. While it will hold weight, movement is the main factor that is prohibited by yv the design. If to complete again would perhaps do a secondary cardboard 1:1 with tighter joints as this would potentially give me a greater undestanding of the potential twist in the final product. While the stool is useable for me, I believe a redesign process would need to be undertaken before it could be even considered to be take to market. Structurally it needs more rigidity and perhaps this could be achieve my lamenating layers of the legs to make the sturdier or perhaps completly redesigning the orientation and design of the legs so that they offer more support.