The engineer’s combination square
Today I begin with talking about my square. I have more than one for practical reasons, but the one I reach for the most is a standard engineer’s combination square. As the name implies, this tools was designed for the highe demands of the engineer.You will likely add more types and sizes as you grow your collection so patiently wait for them and buy at the right price.
My old Rabone combination square
I have owned a Rabone since I was around 15 years old. Almost fifty years. It was indeed the first square that I ever bought or owned. I also own a large roofing square for the occasional need on say sheet goods like plywood and laying out projects on story boards.
I buy the traditional squares, the ones with wood and metal (brass) stocks and wide, flat plates too, if I see them and also good ones like this Rabone square made in the 1940-50s, because they are useful too.
Convenient to hold
The main advantage of the combination square for woodworkers over many others is that it’s a one size fits all hands which gives the convenience of holding the square against the workpiece without overextending the hand. The holes in the stock casting allow for excellent grip, an essential ingredient for small-handed people and convenient for all.
It stands to reason that the square must be exactly what its name says, dead square. There can be no compromise on the accuracy of a square and so you must pursue this ruthlessly if you want fine and accurate work. Any compromise here will telegraph throughout your work and make it impossible for you to produce the impeccable standards you must strive for in joinery and so on. You can read more on this in an earlier blogpost and if you are looking to restore one you have or find here is another blog.
Cheap square may not be so cheap
In my experience, low cost alluminium squares are surprisingly accurate when you first buy them. In a matter of a few days of constant use at the bench however, they can and do go out of square. At first this is not so evident and you find yourself working without realising the shoulder lines of joints are not lining up all the way around. The problem worsens and then you discover several areas where your work has been compromised with inaccuracies. Alluminium squares are also quite lightweight, too light in weight actually. Here I like the extra weight of cast iron for the stock. Cast iron wears well and adds the extra weight and heft I like. It feels balanced in the hand too.
Our everyday squares
We have used new squares at the school in the UK for three years. We use a Stanley Rabone square that has a cast iron stock and hardened steel beam. Their reference number is: Stanley Rabone Combination Square 12″ – 300mm Professional Cast Iron 0-46-151. This one I bought brand new online on eBay for £12.99 plus £1.50 shipping. There are many other suppliers selling for under the £20 mark but many selling at regular retail, which is still good value for money at £28.
In our USA New Legacy New York school we went with the Sears Craftsman 12” square. Sears offers a no-nonsense lifetime warranty on all of their hand tools regardless of how damage occurs and have done so for decades. It makes sense to use their squares, which though aluminum stocks, are heavier stock than average and so have extra weight. These are fairly new to the school, but we have needed to return only one and that was a manufacturing failure and not through deterioration or use.
Problems buying secondhand on eBay
Issues are wear mostly. The beam can be worn on the corners and this isn’t good because we use the knife and pencil so much along the beam and this can compromise our crisp clean edges.
The best squares
I think Starrett combination squares are the very best made. For the quality and engineering standards they tick every box. Price wise they represent good value for money, but they are more expensive at three to five times the price of all others.
This combination square expands the functionality of the tool from the simple square of conventional try squares to include forty-five degree capabiity for marking and cutting as well as test checks for both square and angle. This then at least doubles the value and purpose of the tool. The sliding beam (blade or plate) makes the tool versatile too in that you can slide the beam to suit specific applications.
My now old Rabone square mentioned above did cost me a week’s wages. A hefty price back then. But having used the craftsman’s I worked under for several months the time came when I saw the need to buy my own and I then saw the absolute need for accuracy. Back then there were cheap alternatives but they were so bad no one would buy them so that made my choice a simple thing. My general advise on this particular tool is that you buy the best you can. The less expensive ones may not last as long but they must not only last, they must retain