Wednesday, August 16, 2017

Long Overdue Brew Cart Completion

To my regular readers, sorry for the long delay.  I've been meaning to write this for a long time now.  Since March, actually.

If you refer back to the previous article about rebuilding the brew cart, "The Cart After the Horse", you'll notice some design changes from the original sketch.  The original sketch had the plywood on top to add some torsional rigidity to the parallelogram of 2x4's.

However, what I realized during construction is that the design left very little clearance between the bolts for the 2x4 construction and the screws for the large swivel casters.  So, the design was modified and I added a second layer of shiplap boards to create a bottom shelf.  Additionally, I added 2.5 inch drain holes to the 4 corners of the plywood, should any liquids make their way through the layer of shiplap.
I could have gone all crazy and used stainless steel hardware everywhere, but the old cart used plated fasteners and I found very little corrosion when I took it aparts so I used cheaper grade 5 stuff.  Having a miter saw and a drill press made the whole job a lot easier than the last time I built a cart like this.  I used square drive decking screws to fasten the plywood down along with a nice bead of carpenter's glue.

I used an "Early American 230" penetrating stain from Minwax to add some color to bring out the grain of the wood and provide an oil-based seal.  This cart will see a lot of water over the years, so sealing all the wood pores is vital to its longevity.  The bottom of the plywood was stained as above before anything else and sealed with a water-based polyurethane.  Hopefully, it will never bee seen again so this step was just to prevent water damage.

The shiplap was then cut to length and arranged for an aesthetically pleasing grain pattern.  Any
boards that didn't match or had any imperfections were assigned to bottom shelf duties.  My daughter has an eye for art, so I asked her to help with choosing the right arrangement of boards.  Although unplanned, the math worked out well for the boards between the 2x4 uprights.  Had I thought of it sooner, I would have also run a center support, lengthwise on top of the plywood so that I had something to fasten the shorter boards to (between the uprights).  As it turned out, I used shorter pieces of scrap 2x4 under the edge of the last full board to support the shorter boards.  Problem solved if a little inelegant.  

All the lap joints of the shiplap were glued with carpenter's glue in an attempt to make the shelf water-tight.  The same Early American stain was applied after several hours of sanding.  The 2x4's required more sanding than the shiplap as you might expect, but sanding down to 320 grit really makes the grain stand out, even on prime 2x4's which are still much less expensive than real hardwoods.  I let the stain soak in and dry for 48 hours and then began the application of Waterlox Original (as mentioned in The Cart After the Horse).  You can see in the photos that the Waterlox actually increases the amount of yellow hues and softens the contrast in the grain.
The top shelf was constructed along the same lines, but as you can see from the layout photo, the number of shiplap boards didn't fit exactly.  I used this to my advantage by ripping the last board in half so that I could used square (unlapped) boards to place as end caps.  The top shelf was sanded out in the driveway while more coats of Waterlox was applied to the bottoms shelf in the garage, away from the sanding dust.  This allowed me to work on two things at once, switching back and forth.

Finally, the top was stained and fitted to the bottom after drying for 48 hours.  I bought one more piece of shiplap to make a backsplash.  This was more to prevent things from rolling behind the cart than worrying about splashing.  Forgot to mention that the shiplap was fastened to the 2x4 rails with a pneumatic staple gun, like you would use for hardwood flooring.  The staples are on the lap tongues so that they are not exposed.  I had to turn the air pressure down to 40psi to keep the staples from ripping the softwood apart like paper and fine tune the fit with a nail set.

After several coats of Waterlox, I built a 2x4 upright to hang the electrical box on.  The backsplash I added after the design meant that I had to cut small pieces of shiplap board to acts as spacers for the lower fasteners.  This is the only place I used stainless hardware since it would be exposed.  One of the things I learned from the old cart was that my silicone hoses were too long to hang from the side of the cart so I added the hose hanger on the back of the control panel.  This lets them hang down without needing to be looped around and that allows them to drain.

The last step was adding the pumps to the bottom shelf.  I used T-nuts on the bottom of the shiplap boards to I could "bolt" the pumps down and it wouldn't be a major undertaking to remove one.  I've had pumps go bad before.

Overall a successful project that accomplished all the goals I set for it.  This cart is much lighter than the over-built monster that came before it.  Hardwoods would have made the cart more durable and better looking, but also heavier.  The difference in weight between
pine and poplar is significant when you put this much together and oak would have been heavier than that.  Not to mention a ton more expensive.  Other than the fasteners and finish, the lumber for this project was under $100 with the shiplap eating up 3/4 of that number.  Many of the fasteners were recycled from the old cart as well as the casters.  I've used the cart for a couple of brew sessions and the pine shiplap will not take much of a beating.  I put a big dent in one board just moving the mash tun to empty it.  However, moving from the garage to the carport for brewing is so much easier due to the reduced weight.

Wednesday, March 22, 2017

The Cart After The Horse

I have been brewing for nearly 18 years now and have had several iterations of various equipment and brew setups.  The old brew cart (shown at right) has served me well since I built it in 2008 to accommodate the original heat infusor shown below.

This was my first attempt at computer controlled heat management, long before The Electric Brewery and many of the other Electric Brewery systems that are popular today.  They are popular because they work.  This heat infusor was difficult to use.  It clogged with grain particles easily, had a very bad habit of scorching wort as soon as you were not looking and had no safety protocols preventing the heating element from running dry.  I burned up a couple of heating elements by leaving the unit powered and running the liquid out.

The cart that was built for this purpose was designed to use propane burners for both the hot liquor and the boil kettle so it had a tile backsplash, a concrete backer board and 18" x 18" ceramic tiles under the burner locations. Since the jambalaya burners I used would throw off tons of heat, and the mash tun the system was designed around was a plastic beverage cooler, there was a lot of space built in around each vessel.  It was originally designed to have drawers under the counter to act as storage space for cleaning chemicals, tools and etc.  That would work great if it had been stationary, but moving it would have made a mess.  It was also heavy.  It was so heavy that I had to use a block and tackle to lift it upright after putting the casters on the bottom.  Adding a bunch of junk to drawers would have made it even heavier.  Everytime I wheeled it out into the carport was a back breaking affair and putting it back was just as difficult.  It was time to rethink this.

One day in February (2017) I just deconstructed it.  I saved very little of this behemoth, sending most of it to the yard waste recycler.  When I designed a new cart in Google Sketch Up, there were basically 4 design parameters:

  1. It must fit all three of my kettles and allow some workspace near the front so a 60" x 30" work surface was prescribed.
  2. It needs to be lightweight.  I wanted to be able to move it easily when unloaded without giving myself a hernia.
  3. It needs to be lower to the ground.  I designed the original cart to be the same height as the average kitchen counter (about 30 inches high).  Completely ignoring the part that my kettles were 24" tall at a minimum and that peering inside these kettles would now require a minimum height of 54 inches.
  4. It needs to support the weight of all three kettles when full.  With 2, 15 gallon and a 20 gallon kettles this is 50 gallons at full capacity.  Assuming 8lbs/gallon + 20%, the math 50 x 8 = 400 + 20% = 480, rounded up to 500 lbs.
So here is the design I came up with.  Using premium pine 2x4 construction, according to the Cornell University Capacity of wood Column Calculator, it should be able to support about 1900 lbs.


Why PAWS and what does it mean?  Portable, Automatic, Wort, System.  Plus it ties in nicely with the 3Dog Brewery theme.  

Construction has begun, but you will have to wait for the next post to see any.  Sure, I could have purchased a stainless steel work table or even a work surface to put on top of this cart, but it would have been 10x more expensive.  Pine 2x4's are cheap.  Plus, using wood as a medium, I can make it exactly the way I want for a very low materials cost. 

At this point, the most expensive component of this cart is going to be the finish.  After using several different types of finishes on many wood projects, and viewing many YouTube videos, I love Waterlox Original.  Waterlox original is the most forgiving, best wearing, warmest finish I have ever used.  This stuff can make cheap pine 2x4 look like art because it uses both boiled linseed oil and a tough resin sealer.

Stay tuned to see how this comes together.