by OmlOml, published
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Thank you! We have a CNC machine with a 2 1/2' x 2' bed so we have to tile the toolpaths. What do you think about cutting on the lines for everything, using a spiral down-cut bit on a new spoil board with each cut?
It really depends on the size of the bit that you use and how you want to cut it. If you cut it like I did then Use a 6mm bit "ON THE LINES" on the interior top and bottom of the main bed (you will see that there are straight lines in these parts as opposed to long ovals)[note: this bit caused my plywood to "blow-out" and splinter the underside of the plywood- you may want to switch to a 3mm bit for this section and cut "OUTSIDE THE LINE" or do some tests to see if a slower speed and a brand new 6mm bit will cut it cleaner]. On the interior middle (the long ovals) I used a 3mm bit and cut "INSIDE THE LINE" On the exterior profile of the main bed I used a 3mm bit and cut "OUTSIDE THE LINE". On the sides and the bottom bed I cut the exterior profiles using a 6mm bit "OUTSIDE THE LINES" and the interior cut-outs by cutting "INSIDE THE LINES" - Hope this helps. Oh and, please post some photos of your chair when it is done and any comments on what could be done to improve it or the process.
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I only used a 3mm bit for the sides and the lower bed. I chose the 3mm bit because it gave a cleaner cut but it does take longer!
When you have cut out the four pieces you will probably want to lightly sand off any splinters from the cuts.
I assembled it by first laying the lower bed on a table and placing one of the middle "T" notches in the clamping joint. To do this I used 4 Irwin brand quick clamps to open and clamp the joint into place. This process took some time and it pays to go slowly so that you don't damage the parts of the chair. after working the first side into place I then set the lower bed on a low stool and let the assembled side rest face down on the work bench while I worked the second side into place using the same process - start in the middle and work to the ends
With the bottom assembled I set the partially assembled chair on a table and draped the top bed over the sides. Again, I started in the middle of the bed and worked toward one end then the other using the quick clamps to open the joints and slip them into place over the "T" notches. The only part that was assembled out of this order was the end with the tightest bend. This end didn't look like it would make the turn if the last clamp joints were connected. I put this in place after I fixed, by hand, the connection problem I mentioned in the warning section above. There are some pictures of the assembly process and the design process at: therchair.wordpress.com
This chair was inspired by: the Frank Lloyd Wright re-designed chair made at the Makelab ( makelab.wordpress.com/2012/05/08/dining-chair-inspired-the-wright-way/# ) , "Relax" rocking chair by Vernon Panton in 1974, and the work of Gregg Fleishman ( greggfleishman.com/furniture.html )
Special Thanks to the Fab Lab Wellington and to Massey University for the use of their facilities. facebook.com/FabLabWGTN
or see their thingiverse page:
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