Wednesday, May 18, 2011

benchin' and buildin'

Toni was mountain bike racing on Sunday at the track at Grafton, I was dobbed in as the event photographer

Toni racing at Bom Bom Forest
She did well, coming first in her category.

and now back to our regular programming
I managed to get back up to the track while Toni was at work the other day and get some more benching done
More benching done

and I managed to drag her out to help me build our final obstacle on the new trail.  There was a large tree that had fallen, the "Y" where a large branch came off the trunk presenting an opportunity to fill with logs and provide a platform to drop off the downhill side.  We needed to build a ramp on the other side. The logs to be used for the stringers had been curing for some time

Logs curing
We roughed in where we wanted them, then dug the footings
Ramp footing
These are set on rock and kept in place by rocks, to minimise contact with the soil and help stave off the stringers rotting.

Final alignment check
Then a final alignment check before we chainsaw and chisel the notch for the other ends to sit in

Chisel work
Toni finishing off the notches after I had used the chainsaw to rough them in.

Ready to attach the decking
Then sit the logs in the notch, countersink a hole about 1/2 way through the stringer, screw in some 100mm batten screws to hold them in place.  Attach the top and bottom decking planks, attach the string line to keep one side even and screw down all the decking.  We managed to source a supply of recycled hardwood tongue and groove flooring, so we use that for the decking.  We discussed using a couple widths, from 300mm through to 600mm and settled on 400mm as a good compromised between too narrow and too easy, we think it's a nice width to use for the decking for this ramp.

straightening the outer edge
Decking is all laid, then use a chalk line to mark the other edge, and trim up with a battery operated circular saw.... and voila

Looking from the approach side
the ramp is finished, the middle of the "Y" has been filled with logs to provide the platform

Looking up
Looking up the track.  The proof of course, will be in the riding !

The ascending line and the "B" line for the descent, off to the left.

"B" line
where a piece of the tree was cut out to allow riders through.

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