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Making a Denver Observers Chair
Submitted: Wednesday, 29th June 2005 by Mike Salway
finished_in_position.jpg

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The chair finished and in position

While waiting for my telescope to arrive, I got busy and started working on the Denver Observers Chair.

From all the sites I'd read, being comfortable while observing was almost worth an extra inch of aperature! Keep reading to find out my thoughts on the chair, the construction of the chair and any lessons I learned.

The Chair

The chair cost me roughly AU$80-$90 in parts, the most expensive bit was the damn non-slip stair tread that goes down the front leg, ~$30 (ripoff!). There was also a fair bit of waste of some of the parts (stair tread, particle board for the seat and seat supports) so that kept the cost higher than expected, had I been able to buy just the quantity I needed.

The instructions are also very american, with all the measurements in inches, so sometimes a conversion was needed, other times I was able to buy the specified size in screws etc, and had to find my drill bits (in metric) that matched.

It took me about 2 weeks on and off to finish it, working on it for only 2-3 hours a week in-between crying babies, work, TV, etc.

finished_folded_up.jpg

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Folded up for transportation

I'm pretty happy with the result, learnt a few things along the way which would hopefully churn out a better result if I was to do it all again, but it does work and it's ready for action.

The seat is kept in place by friction, and is adjustable up and down with a tilt of the support. When locked in place in the open position, it's easily transportable using the handle, and is even easier to transport (again using the handle) when folded up and kept closed using the velcro straps.

It's not light, but it's not that heavy either. I can easily lift it with the handle and shift it around using 1-hand, and it folds up quite flat for laying in the boot of the car when going out to a dark-sky site or just storing it away until its next use.

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All the bits,
ready for construction!

The Construction

Went to the hardware store and got all the bits on the list.. Cost was around AU$80-90, but could've been cheaper if I was able to buy just the quanitities I needed..

The seat construction (seat and seat supports) were probably the fiddliest part of the project, and going by the instructions, also the most critical to get right.. If it's not right, the seat would probably slide down the leg when you sit on it!

legs+chair1.jpg

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Seat support and legs

Once the hinge, aluminium brace and chest-handle were put in place, the seat was ready to be attached to the front leg. But first, the non-slip stair tread had to be stuck down the front leg, and the rubber fuel tube nailed onto the back of the seat.

I peeled off the backing of the stair tread, but found it wasn't even close to being able to be stuck to the front leg, so I used some liquid nails smeared on the front leg, and placed the stair tread on top.

It stuck quite nicely, but I ended up being a bit messy with the liquid nails, making the end result look a bit shabby.

Once that was dry, I attached the seat support to the front leg and gave it the first test run.. It worked! The seat didn't drop straight to the floor with me on it!

Finally, some lessons I learned along the way..

finished_in_position.jpg

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Finished and in position

Lessons Learned

If I had to make the chair again, I'd do a few things differently - hopefully to achieve a better result next time.

I'll share my experiences with you so that if you decide to construct a chair, you won't fall in the same traps I did.

  • Choose wood without marks

    The 45x90 construction pine I bought had some unsightly marks on it, like splatterings of paint.. Ideally I should've sanded them off, or bought a piece without the marks on it in the first place.

  • Choose wood without defects

    Again with the construction pine, I didn't scrutinise the wood for defects before buying it. When I got it home and started measuring it up, I found some splits and cracks down one end which broke off while sawing.

  • Buy only what you need

    If you can, try to buy just the quantities you need in order to reduce waste and keep the cost down. This might mean going to seconds yards to get offcuts or similar.

  • Use plywood instead of particle board

    I used particle board for the seat and seat supports, which on the surface looks fine. However if it gets wet it can swell up and fall apart, so ideally I should've used plywood or a different timber that is better suited to outdoor use.

  • Use proper stain instead of linseed oil

    When all the wood was cut and assembled, I used linseed oil to protect it, which was a bad move. It takes ages to dry and the smell hangs around too. I should've used a proper outdoor stain to protect the wood and give it a nicer appearance.

  • Be neater with the liquid nails

    The stair treads had no chance of sticking to the front leg on their own, so I used some liquid nails to give it bite. However I was a bit too generous with the application and it stained the visible side of the stair tread as it squeezed out the edges. It doesn't affect the performance, it just doesn't look as neat as it could.

  • So there you have it.. Good luck making your own chair!
    Article by Mike Salway (iceman). Discuss this article on the IceInSpace Forum.
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