up148 wrote:I've seen photos of many lightweight modules over the decades, but I like yours a lot. What wood are you using for perimeter and cross members. What is the best method you've found for cutting this 2" thick foam board?
I prefer to use poplar for the for sides of the frames. Aspen was used for one of the long, straight side of the end loop modules, but only because poplar was out of stock in the size we needed and we had a schedule to meet. I recall that aspen is a little bit lighter and a little bit softer than poplar, but we have had no problems with those modules. Still, poplar just feels like the right material. It is knot free and is easy to work with in regards to sawing, drilling, gluing, and painting. It is sold with a smooth finish in two foot and four foot lengths, which is very convenient when you are making 2'x4' modules. It is available readily at Home Depot and Lowes (at least here in Dallas). I generally have to pick through the stock to find straight pieces. For this project, I had to visit three different stores to find enough straight wood for six modules, but this was well worth the effort. The pieces are usually dimensionally accurate but I recommend checking each piece carefully. I buy a few extra pieces in case I make a mistake (which, yes, does happen) or to cover me if I find a flaw in a piece only after I get to the shop and start working on the modules (that happens too).
As to cutting foam board: In the past I would use a sawzall (also known as a tiger saw). It is easy to control but does make a mess. This time somebody on the team suggested we try a box cutter. That would not be all that practical but a couple of years ago I found this bad boy at the big box store:
The pencil is shown for relative size. This thing works great. You push out the blade just a bit for the first cut, then extend it for subsequent passes. A fresh blade is long enough to cut all the way through. It takes about four or five passes -- trying to cut too deep on any one pass tends to gum things up and pull out the foam instead of cutting it.
You get four decks, each a little less than 2'x4', from a 4'x8' sheet. We cut the long sides a little bit wide and then finish and square them on a table saw. This is the way to go -- it's fast and accurate and you get only a small amount of pink sawdust:
As seen, after we cut the decks we mark the back side for the areas to be routed. That's the next step, so I will report back after we get that done.
Jim