Furniture #36: Mushroom seat Mk II Pt 1

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Blog entry by robscastle posted 11-10-2018 09:03 AM 1074 reads 0 times favorited 4 comments Add to Favorites Watch
« Part 35: Shoe rack cabinet Tilting Door done Back is on and In Location Part 36 of Furniture series Part 37: Mushroom Seat Mk II Pt 2 unassembled finished »

Back in 2011 and from the looks of it, it was before I joined LJs that I made a mushroom seat from some pine recycled pallet wood.

At the time I used polyeurathene glue and Kreg pocket holes along with biscuit joints.

I am not sure how I made the “splay” joints at the time, ... I think I just sanded them until i got a reasonable fit!.

The inside detail

It spent most of its life in the garden as my go seat when I was doing “stuff”
Last week I was replacing the disc pads on my Ute and had it under the body holding tools for me.

I left to do some cleaning and upon my return found the hydraulic trolley jack had leaked down putting all the body weight on the little seat.

The mushroom seat is now no more, ... 7 years of loyal use has ended!

As it was a vey usefull piece of kit so I decided to make another one today.

I had a heap of Red Ironbark available (nothing will crush that) so I decide to use it.

I replicated the original design with a few mods and this time I used used Matthias Wandel’s Polygon chart to calculate the required “splay

Basic design
300mm high
10 deg angle
8 segments

So looking at MW’s chart that gave me 4.11 deg and 22.14 deg to work with.
Now trying to achieve those sub divisions was impossible for me so I set 4 deg angle and 22(and a bit) of blade tilt.

I worked out how to set everything up and cut the first angles.

This is the simple jig setup.

Once I had everything cut I dry fitted it up on the bench, to see how much of a gap mismatch there was.

It looked reasonably OK so I set it all up on the table saw for more accuracy.

Now the dilemma starts, ... how on earth could I glue up something like this accurately? ... after muddling around trying all sorts of bizare methods I decide to just frame it up in two halves then progress from there.
(Again Matthias has it covered, check the link for his method)

Here is 1 half side.

and the other end.

Then it was the the second half ’s turn

and another view.

Thats all I managed to achieve today, so tomorrow, I will have to figure out the internal bracing to ensure its rigid and continue on.

-- Regards Rob

4 comments so far

View patron's profile


13722 posts in 4461 days

#1 posted 11-10-2018 09:31 AM

sweet success rob

great up-grade and replacement

‘course now maybe a bottom ‘shelf’
drawn down thru the hopper
set up a bit from the bottom
and maybe a couple access cut-outs
on the sides to store tools or stuff

here in the states at our age
maybe a recliner modification
with a shade umbrella
and pop-up drink holder
wi-fi port and blue tooth range extender

or just get a golf cart

iron on

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View stefang's profile


17040 posts in 4454 days

#2 posted 11-10-2018 11:07 AM

This looks like a solid replacement and eye pleasing too Rob. Wish I had some of that nice Australian wood to play with!

I have something similar I use to sit on for close to the ground work. It is two circles of plywood with 2 small plywood squares joined with a half-lap joint separating the top and bottom. The circles are just screwed into the top and bottom edges of the half-lap piece. It was a seat for a little table and stool set we bought our son when he was 3 years old. He is now 51 and I’m still using that little stool, but definitely not to hold up my car!

-- Mike, an American living in Norway.

View crowie's profile


4666 posts in 3071 days

#3 posted 11-10-2018 08:40 PM

Top marks Rob…. Very impressive

-- Lifes good, Enjoy each new day...... Cheers from "On Top DownUnder" Crowie

View Joe Lyddon's profile

Joe Lyddon

10963 posts in 5172 days

#4 posted 11-10-2018 09:39 PM

Good JOB… Thank you!

-- Have Fun! Joe Lyddon - Alta Loma, CA USA - Home: ... My Small Gallery:

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