Monday 3 June 2013

Final Design : Zen




Finishing Process



Porter's Clearcote





Dedicated a great amout of time to the finishing of stool, sanding prior to coating to shape edges and during coating to smoothen surface. Experimented with coating the Xanita board on a seperate piece but decided against it. 
3 coats were used per side. Sanded lightly with a 400 grade sandpaper in between coats.


Tuesday 28 May 2013

Construction Process Part II


Since the CNC queue was way long and there was a good chance the seat was going to be overweight I decided to experiment with my original seat idea using laser cut 5mm birch ply that matched the frame. 


Laminated the bits together, once again great precision was required. 


.Finished seat looked better than expected


Stool was extremely sturdy. However with some force applied the seat was able to shift slightly. Although this wasn't a problem i decided that it should be rectified as it may cause frame to fail in the long run. 


Cut slots using the band saw and a cutter for a second top cross brace. 


Top Cross Brace


Bottom Cross Brace

Tuesday 21 May 2013

Construction Process


Fresh out of the laser cutter. 5mm birch plywood. Tabs used to align pieces of ply and Xanita board when laminating. 


One side was laminated to Xanita board.




The Xanita board was then cut by hand on the inside. The outer portions was cut with the bandsaw.


Pvc pipes was used to ger the alignment right. This was in my opinion the hardest part. While the idea of using the tabs was "in theory" going to work. They shifted about alot. If slightly misaligned, the balance of the stool and the fitment of the two major frame parts will be compromised. 


Cross joint before depression is cut from Xanita board for the cross brace. 


Like the rest of the frame, it was hard to finish the Xanita nicely. It is virtually impossible to sand to a nice finish. These parts will however be concealed by the brace. 



After ensuring all 4 pieces are aligned, parts were glued together with PVA glue. The tabs were then cut off.

Seat Idea  




Bought some re purposed Douglas Fir for Urban Salvage. The timbers were meant to for the CNCed seat top. Realised that it actually weighed a ton and was hoping once CNCed it will be much lighter. 



Cut up the planks and glued them together for the desired size. Domino joints and pvc were used. 



Design of CNC seat


Sent in to CNC however the block of wood has been sitting there due to the long queue. 



Tuesday 14 May 2013

Stage 5 : Final Design Sign Off

Changes made to design: Changed the direction of taper. Increased seat size and reduced base. Intention of new design was to allow the stool to be assembled and disassembled without the use of screws, bolts etc with ease and to promote flat pack design and portability.


Assembly Drawing / Exploded View Drawing






Individual Part Drawings






Saturday 11 May 2013

Evolution of Concept




Using the idea of the cross joint, I explored various forms on Solidworks. All forms utilized a triangular sheet metal "bracket" that sits on the top of the stool holding the two main pieces together, strengthening them while also acting as the seat.


Simplified form using triangulation on the seat "brackets" as well as on the frame at the various stress points. 



Reduced taper of frame as seat from previous forms proved to be too small. Also developed form of frame to be more aesthetically pleasing.