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MCAD Furniture Class #3: Design Presentation and Final Modifications

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Blog entry by Jeff posted 04-28-2008 07:37 AM 4097 reads 1 time favorited 8 comments Add to Favorites Watch
« Part 2: Inspiration Part 3 of MCAD Furniture Class series Part 4: Building a Scale Model »

The next week of class was consumed by each student presenting and speaking to their design what their main tenets would be for the project. Part of the previous week’s assignment had been to pick your tenet or tenets and be prepared to stick with them. My main tenet was to see the design through and devise a way to pull off the cantilever. I knew it was going to be tough just by all the drawing work I had put into SketchUp. Seriously, there are only 6 90-deg corners (aside from all the joints in the torsion box) in the whole design. I was truly worried I would be told this was too aggressive.

When my turn came to present my concept I prefaced my comments with the fact that I intended to attempt a design with a cantilever in it. I discussed my inspiration piece. Our instructor liked the beam table (see the previous blog entry). This was a good sign… I unveiled my second design concept and Willie (the instructor) instantly commented it was a strong design but in the same breath noted the complexity. I jumped right in and spoke to the ideas I had about how I could strengthen the joint by bolting the top to the main support. mcadDesk_concept2

The gap in the torsion was intended as a slot for a flush-front drawer. He ultimately could see that I had put a lot of effort into accessing the problems I would face and supported my decision to build it as long as I 86’ed the drawer. I was ecstatic and surprised at the same time.

After everyone had talked about their proposed projects we each got to spend a little time in one on one !discussions with Willie. He reemphasized the challenge ahead of me but also told me he would like to see me succeed. We set about addressing the top and it’s weight. Rather than execute the design as it was, why not just make the whole top a torsion box? It would further cut down on the weight and since it was a torsion box, there would be plenty of strength even with a 5/16 skin of plywood on the top of the box. I agreed I would take the next week to modify the drawings. The only problem was, at the end of design presentations, our new assignment was to bring a model to class the following week…

Here are some views of the final design where the whole top would be a torsion box.

Plan View
plan view

Front Elevation
front elevation

Right Elevation

Left Elevation

Isometric views
isometric 1

isometric 2

Now, all I had to do was build a model. Here is a sneak peak of the 1/6th scale model. In the next entry, I’ll discuss what the model helped reveal about the design.

sneak peak

-- Jeff, St. Paul, MN



8 comments so far

View Dorje's profile

Dorje

1763 posts in 2715 days


#1 posted 04-28-2008 08:14 AM

Intriguing!

-- Dorje (pronounced "door-jay"), Seattle, WA

View Scott Bryan's profile

Scott Bryan

27251 posts in 2540 days


#2 posted 04-28-2008 11:16 AM

Jeff,

This is, in a single work, fascinating. You have a wonderful opportunity presented to you and are taking full advantage of it.

Keep us advised about your progress. I, for one, am enjoying this.

-- Challenges are what make life interesting; overcoming them is what makes life meaningful- Joshua Marine

View ben's profile

ben

158 posts in 2589 days


#3 posted 04-28-2008 01:53 PM

Jeff,

It’s impressive to see you take full advantage of this course and instructor, and perhaps more importantly, pushing your own limits. The design looks excellent, but the model tease is cruel… We gotta see the whole thing!

-b

View Greg3G's profile

Greg3G

815 posts in 2804 days


#4 posted 04-28-2008 02:58 PM

Great Design. I too would like to see the finished verison. Anythoughts at to wood selection and finsihes yet?

-- Greg - Charles Town, WV

View Jeff's profile

Jeff

1011 posts in 2812 days


#5 posted 04-29-2008 03:41 PM

Thanks fellas. It really did take me to the limits and stretched my confidence to a point where I’m probably just cocky enough to be dangerous and will surely make a slew of massive mistakes on the next project. :-)

ben, I don’t mean to be cruel. ;) Next entry to come soon.

Hi Greg. The piece is Mahagony and will likely be dyed a couple of shades darker and then simply oiled. Perhaps a coat of more protective finish on the just the top. Not sure yet.

Thanks for following along. The posts will start to get more interesting now as I get into relating all the challenges with building it. I built no less than 5 jigs for this project…

-- Jeff, St. Paul, MN

View johnjoiner's profile

johnjoiner

160 posts in 2612 days


#6 posted 05-02-2008 06:00 PM

Hi Jeff.

This sounds like a very cool class. I will keep following this series as I’ve been interested in the MCAD classes too.

I really like your table design. Two questions:
1) Is the top of the upright part of the base going to come all the way through the table top? Or will you hide that under the skin?
2) It looks to me like the table will be a little tippy (in your ‘plan view’ image, tipping to the lower right). I wonder if you might have to make the end of the beam that touches the ground wider some how to add stability. Have you or Willie talked about that, or tested it somehow?

Best of luck.

-- johnjoiner

View Jeff's profile

Jeff

1011 posts in 2812 days


#7 posted 05-03-2008 03:36 AM

Hey John. I don’t know how I haven’t made the connection in 217 days… I wondered if there was anyone else in the guild that frequented this site. I’ve shown it to Charlie but I don’t know if he is lurking or not. We’ll have to see what kind of questions I get the next time I go to a meeting wearing the LJ shirt I received as random selection in the bookshelf challenge (thanks again, Martin).

To your questions -
1) At one time there was a consideration to go through the top and use wedged tenons but as this is going to be our desk in the office/spare room, I didn’t want to kludge up the surface of the top. So, it will go all the way through the torsion and stop at the underside of the skin.

2) Plan view – Did you mean lower left rather than lower right? If so, good eye and good question. It was a concern I had too but I decided to leave it to the model as an experiment. And, the model did tip but I had no way know how much pressure in the real world it would take to tip it. I’m happy to say that the Mahogany is plenty hefty and keeps it well grounded. I think the top would actually be damaged first before any tipping but that remains to be seen.

As for stability, there is a solution that I will elaborate on in a future entry.

Thanks for the compliment and your interest.

-- Jeff, St. Paul, MN

View Karson's profile

Karson

34901 posts in 3119 days


#8 posted 05-03-2008 06:53 AM

Jeff a nice looking job.

-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Southern Delaware karson_morrison@bigfoot.com †

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