Magazines:  Real Estate Shopping: Adult Costumes  |  Kids Costumes  |   |  Guitars |  
This Issue Archived Articles Blog About Us Contact Us
SEARCH


Building a Work Bench

An invaluable tool you can build yourself

by Julian Edgar

Click on pics to view larger images

At a glance...

  • Height
  • Weight
  • Strength
  • Shape and Size
  • Construction
  • Building a bench
Email a friend     Print article
This article was first published in 2007.

If you do any work on your car, having a good workbench will make life a helluva lot easier. Not only can you work on items at a comfortable height (nothing gives you back-ache faster than working on the ground!), but you can also mount machine tools like a grinder and a drill press. Bolt on a heavy duty vice and you’ll wonder how you did without a bench!

But sourcing a good bench can be damn’ hard so in most cases it is best to build it from scratch. It will take some time and effort but it doesn’t need to be expensive – the bench covered here was built using mostly secondhand materials for under AUD$100 total.

But first up, what do you want in a bench?

  • Height

Click for larger image

Picking the correct bench height is vital. That’s especially the case if you’re going to be mounting a vice on it. The top of the vice should be near to the height of your elbow when you’re standing upright with your arms by your side. That’s because when you place an item in the vice and file it, you’ll have greatest control if the item is at that height. The same applies for hack-sawing.

Many benches are too low – in fact, the majority are too low. Too low a bench will also force you to bend your back more than necessary.

For specifics: I am 180cm tall and my elbow height is 112cm. On my current bench, the top of the vice is 110cm from the ground. That bench is 89cm high, a height I also chose for the new bench shown later in this story.

  • Weight

Click for larger image

A bench should be made as massively heavy as possible. A well built bench will be heavy as a matter of course (more on construction in a moment) but having the bench heavy is something to aim for in itself. Why? A major reason is that when using the vice, you want it to behave as if it’s part of planet Earth! So say you have a metal bar in the vice and you want to bend it slightly. If the bench is light-weight, as soon as you pull on the bar, the bench will skate across the floor. Not good... Of course you can dyna-bolt a bench to a concrete floor but it simply isn’t the same as having a massive weight to work against. The same applies when using a grinder or belt-sander bolted to the bench.

  • Strength

All benches should be built super strong. There are a few reasons for that.

Firstly – and most simply – you might want to put something pretty heavy on it! That might be a gearbox or even an engine. Any well-built bench should tolerate having 300kg or so plonked on top. (Now, do you see what I mean about how hard it is to find a good bench?!)

Click for larger image

Secondly, you don’t want the bench-top to deflect when you’re hammering something on it. Whether you mount a small anvil on the bench, you’re using a hammer an item in the vice, or you simply want to centre-punch something sitting on the bench surface – in all cases, the less the bench deflects, the better.

Finally (and this is an important point when you’re thinking about building a bench), a strong and well-built bench will last you for the rest of your life. Gulp!

I never really thought about the latter until I reflected on the bench that I built 15 years ago. I made it when I was a teacher and so had access to the school metal-working facilities. When it came time one weekend to weld up the frame, the MIG welders were low on gas but I went ahead anyway – and so the welds weren’t nearly as good as they should have been. At the time I thought: so what, the welds will work well enough. Now, when that bench has followed me across four houses and two states, I sometimes wish I’d waited for the shielding gas cylinders to arrive... It hasn’t broken – but I would have taken more care in the construction if I’d realised how long I was going to be working with it! [Incidentally, I paid for use of materials and eqipment in that school workshop...]

  • Shape and Size

A bench can be built in two basic configurations – island or linear.

Click for larger image

An island bench sits in the middle of a space – it’s accessible from three or even four sides. A bench of this type is rectangular with about 1:1 (ie square) to 2:1 (ie rectangular) length:width dimensions. An island bench has some major advantages. You can work with very wide and/or long items. Alternatively, you can mount things at the corners (eg a drill press, bench grinder, anvil) and then easily access all of them. However, an island bench consumes lots of space – so that space needs to be available in the first place.

A linear bench mounts along a wall. Its length:width ratio is about 3:1 or 4:1. A linear bench takes up less workshop space. Where items like a drill press or grinder are mounted on the bench, they tend to be spaced along it – which leaves less room for working. If building a linear bench, don’t fall into the trap of making it more weakly (“it can partly be supported by the wall”) – for all the same reasons as an island bench, it needs to be super strong.

In my case, already having an island bench, I chose to make the new one a linear design.

Construction

Click for larger image

When you build something - like a piece of furniture – that’s meant to be pretty strong, you might give the final item a bit of a push or pull to see how stiff it is. Or say you assemble an Ikea wardrobe – you might lean on it a bit to see if it seems reasonably strong. But a work bench is nothin’ like that! Instead, consider how well that wardrobe would go if you G-clamped a piece of steel to it and then started bashing the hell out of with a big hammer. Or you put a gearbox on top of it.... Clearly, a work bench needs to be constructed to a completely different magnitude of strength!

There are a huge number of work bench building methods, so I’ll deal here only with what I’ve seen work well.

A welded, cross-braced steel frame has the rigidity and resistance to vibration that are unachievable with a bolted steel frame or a dowelled-and-bolted wooden frame. However, the top of the workbench needs to absorb hammer impacts and so must be ‘deader’ than steel – thick timber or particle board is ideal. And when I say thick, I mean thick!

The top working surface can be stainless steel sheet or my preference, a thinnish layer of Masonite (Masonite is a high density pressed wood sheet). The Masonite is easily replaceable after it wears, doesn’t easily dent and can be kept clean with a wipe-over. It also absorbs spills.

Building a Bench

The incentive to build another bench came when I went to a local garage sale. On sale were four lengths of 51mm square steel tube with a hefty 3mm wall thickness. Each had a ‘foot’ welded on it – I think they’d previously done duty as veranda posts. In addition, there were two 3 metre lengths of heavy 242 x 46mm timber planks. These perhaps had been used as rafters or something similar. Total cost for the lot I bargained down to AUD$45. Now forty-five bucks for some bits of old square tube and some wood can look rather expensive (my wife certainly thought so!) – but it isn’t. If buying new, at a typical supplier you’d pay hundreds of dollars for this stuff.

In addition to garage sales, salvage yards often have plenty of secondhand materials suitable for making benches. One of the beauties of building a bench is that you can tailor the design to suit the materials – building-in more braces if the steel and timber are thinner, etc.

In fact, thinking I’d need some further braces, I sourced four short lengths of 17mm diameter steel bars normally used for reinforcing concrete. This steel was bought from a local salvage yard for AUD$5. I added a few pieces of 5mm thick Masonite at a cost of AUD$8 each and the construction materials list was complete.

Construction Tools

The bare minimum in tools for building a bench of this type are a hacksaw and electric drill. However, an arc welder will makes things much stronger. Now don’t shrug and say: “I knew there was a catch – where’s the welding gear and the welder around my place?” Arc welders can be bought extraordinarily cheaply secondhand. As people have moved to inverter welders and other more exotic designs, the humble transformer-based arc welder has got cheaper and cheaper. I bought mine – complete with rods, gloves and a slag hammer – for about fifty bucks... and that’s not unusual. Check eBay (look under ‘nearest first’), secondhand stores and garage sales.

And you can’t weld? That’s fine. Just practice a bit first on some scrap. I know that sounds a bit pat, but amateurish welding that wouldn’t win any prizes in tech school can still be very strong – and much more rigid than bolting, for example. The key is to make sure that you have enough penetration – whatever the case, you don’t want a puny bead just sitting on the surface!

A friction cut-off saw will also make cutting up the steel much easier, and a table saw will make cutting the timber to size neater and quicker. But if you don’t have them, don’t panic...

Building My New Bench

The first step was to decide on the bench height and width. With a strictly finite length of square tube available, the bench length dimension was simply whatever was left over after cutting the uprights and width pieces to size! For the framework I used an upright length of 84cm and a width of 58cm. (Note: the actual height and width of the bench are greater than these dimensions; the height is increased by the thickness of the top timber and the width is increased as the timberwork overhangs the frame a little.) The tube left over allowed a frame length of 172cm.

The framework was in a traditional ‘table’ form – four pieces of tube welded to form a rectangular frame and then the legs welded on. Halfway along the top I welded another piece of square tube across the width.

Click for larger image

Such a frame is already pretty strong – primarily because of the 3mmm wall thickness and reasonably large tube dimensions. But what if a force is applied end-on to the frame?

Click for larger image

As shown in exaggerated form here, the frame will tend to take the shape of a rhomboid.

Click for larger image

A cross-brace, as shown here, will resist this frame distortion. In one direction of distortion the cross-brace will be in compression, and in the other direction of distortion, extension. Therefore, if you’re going to use only the one cross-brace, it needs to be made of material rigid in compression as well as extension. This was achieved in the case of my bench by making the cross-brace from the same heavy-wall square tube as the rest of the frame. I used just the single brace across what will be the back of the bench.

Click for larger image

The same potential distortion can occur if a force is pushing backwards on the bench. The end view would then change from this....

Click for larger image

...to this.

Click for larger image

Another heavy duty cross-brace could have been used – but I’d run out of the square tube. Instead I used the round concrete reinforcement rod. However, this rod is not very strong in compression – it’s much stronger in extension. The rods were used as dual cross-braces - so whichever the direction of distortion, at least one rod will be in tension.

After welding the frame together, it was painted with Dulux Quit Rust Epoxy enamel, a paint specifically designed for steel structures and which bites into the metal very well. It’s expensive (AUD$30 per litre) but it works so well that I am reluctant to try cheaper alternatives. Only about a quarter of a tin was needed for two coats.

The heavy timber planks were then cut to size and glued to the frame. What?! Glued?! Yep. Modern glues are incredibly strong, cheap and quick and easy to use. I used three cartridges of Bostik Zero Nails to glue the planks to the frame and the planks to each other. When the bench is in hard use (eg something is being hammered in a vice), most of the forces acting on the glue will be sheer forces, something the glue is very well able to withstand. The glue also acted as a filler where the planks weren’t dead flat. The alternative of using recessed bolts, washers and nuts would have taken far longer, cost more and not have been any more effective in use.

Click for larger image

After the glue had set overnight, I ran an electric plane over the surface to true-up the planks (a normal hand plane could have been used – or you could have used timber that was unwarped!) and then the Masonite was cut to size and held in place with small brads that were recessed a little below the surface. The Masonite could have been glued into place but that would have made it hard to remove and replace – and one of the advantages of this material is that it can be easily and cheaply replaced after it wears.

On the Bench

Click for larger image

This bench was made primarily to support some tools, rather than act as a dedicated working surface. On the bench were placed an 8-inch electric grinder, a hydraulic press, a drill press, and a small anvil. Each was bolted into place. The bench is easily strong enough, rigid enough and heavy enough to support the anvil – as it would also be fine if a vice later needs to be attached.

Conclusion

A good bench is simply one of the most valuable tools you can have. So it’s worthwhile spending some time and a bit of money in putting together a heavy, rigid bench that suits your height and the working space that you have available.

Costs

Square tube and timber

Garage sale

$45

Concrete reinforcing bar

Salvage yard

$5

Masonite

Hardware store

$16

Glue

Hardware store

$8

Paint (only used about 1/3rd a tin)

Hardware store

$10

Welding rods, grinding disc, etc

In stock!

$10

$94

Did you enjoy this article?

Please consider supporting AutoSpeed with a small contribution. More Info...


Share this Article: 

More of our most popular articles.
Country driving skills have almost disappeared - here are some

Special Features - 4 October, 2011

How Not to Die this Week

If you're designing a vehicle, some very simple calculations can tell you a lot

Technical Features - 14 April, 2009

The Moment Has Come...

Using a prebuilt DIY electronic module to flash high intensity LEDs

DIY Tech Features - 14 July, 2008

Bike LED Lighting Power!

Quick, easy and effective

DIY Tech Features - 11 January, 2011

Fitting a Short-Shift

Designing structures so they won't fail

DIY Tech Features - 21 February, 2006

Making Things, Part 1

Getting a home workshop to the lock-up stage

DIY Tech Features - 2 September, 2008

Building a Home Workshop, Part 4

Where turbos are heading

Technical Features - 20 July, 2007

New Tech Turbocharging

How to organise your home workshop for best results

DIY Tech Features - 25 June, 2008

Laying Out a Home Workshop

Squirt your intercooler spray for 5, 10 or 20 seconds - all at the press of a single button!

DIY Tech Features - 2 September, 2008

Intercooler Spray Squirter

Increase the output of small pumps, lights and fans!

DIY Tech Features - 28 July, 2009

Voltage Booster

Copyright © 1996-2019 Web Publications Pty Limited. All Rights ReservedRSS|Privacy policy|Advertise
Consulting Services: Magento Experts|Technologies : Magento Extensions|ReadytoShip