Garden Whistle Apr 2012 - Sandman.org.nz
Garden Whistle Apr 2012 - Sandman.org.nz Garden Whistle Apr 2012 - Sandman.org.nz
The Garden Whistle - April 2012 Murray’s Measuring Machine Text by Murray Bold (Palmerston North) Photos by Don Ellis (Christchurch) In August 2009, I decided to try and build a wagon that would measure the length of a G scale track. I started with a Hartland 3 plank open wagon and added 2 more planks to make it about 5 cm high. At the Christchurch Convention this year, Lloyd Dickens had a Revolution controlled battery powered camera car loco. I hooked on behind his loco and measured the 9 track lengths ±1.5%. I enjoy using Picaxe microcontrollers and decided to use an 18X. I changed the wheels to a pair that were as near to 100mm circumference as possible. This made the calculations much easier. I also added a slotted disc on the axle and infrared interrupter on the chassis to trigger the Picaxe input. The rest was mainly software. I took the wagon to the Wairarapa Convention and measured the tracks there in 2010. Lengths of the garden railways visited during the convention in Christchurch (in order of visit) Owner Railway Actual length Scale 1:24 Glen & Brenda Anthony Rocky Creek Railway 39.8m 0.95km Kevin & Michelle Leigh Somerset & Willard 38.0m 0.91km Scale 1:29 Andrew & Bindy Hamers 58.9m 1.7km Dean & Lois Farrow The Fenceline Railway 35.1m 0.84km Kerry & Crisma Paterson Ashburton Forks Railway 110.6m 2.6km Karl & Alison Arnesen Jessie Falls & Mt Catt Railroad 83.2m 2.4km Brian Allison Blackridge Lines 50.0m 1.45km Ross & Gwyn Fraser The Fraser Line 136.7m 3.96km Neil & Denise Wiggins Tuahiwi Valley Lumber & Mining Company 90.2m 2.6km To work out the scale length multiply the actual length by your scale i.e. x 24 for 1/24 scale or 29 for 1/29 scale Page 14
The Garden Whistle - April 2012 Rosebrook Tunnel Rebuild Text & photos by Lee Collett (Carterton) Attached are photos of a major reconstruction of the Rosebrook tunnel lining. The photo below show the tunnel lining on a lean due to the weight of earth and rocks on top. Wagons were scraping one side of the tunnel. We found that the tunnel was leaning to the left. A new square tunnel liner was built. The following photos shows the construction work. It took about 4 hours to replace the old with the new lining. After it was finished the line was open and up and running. The second to last photo shows the first train through the tunnel pulling Christine’s new Swiss dairy container wagon. Digging out the old tunnel liner The new square one fitted First train through to test the clearance. The finished hill ready for plants to grow again Page 15
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The <strong>Garden</strong> <strong>Whistle</strong> - <strong>Apr</strong>il <strong>2012</strong><br />
Murray’s Measuring Machine<br />
Text by Murray Bold (Palmerston North)<br />
Photos by Don Ellis (Christchurch)<br />
In August 2009, I decided to try and build a<br />
wagon that would measure the length of a G<br />
scale track. I started with a Hartland 3 plank<br />
open wagon and added 2 more planks to make it<br />
about 5 cm high.<br />
At the Christchurch Convention this year,<br />
Lloyd Dickens had a Revolution controlled battery<br />
powered camera car loco. I hooked on behind<br />
his loco and measured the 9 track lengths<br />
±1.5%.<br />
I enjoy using Picaxe microcontrollers and<br />
decided to use an 18X. I changed the wheels to a<br />
pair that were as near to 100mm circumference<br />
as possible. This made the calculations much<br />
easier. I also added a slotted disc on the axle and<br />
infrared interrupter on the chassis to trigger the<br />
Picaxe input. The rest was mainly software.<br />
I took the wagon to the Wairarapa Convention<br />
and measured the tracks there in 2010.<br />
Lengths of the garden railways visited during the convention in Christchurch (in order of visit)<br />
Owner Railway Actual<br />
length<br />
Scale<br />
1:24<br />
Glen & Brenda Anthony Rocky Creek Railway 39.8m 0.95km<br />
Kevin & Michelle Leigh Somerset & Willard 38.0m 0.91km<br />
Scale<br />
1:29<br />
Andrew & Bindy Hamers 58.9m 1.7km<br />
Dean & Lois Farrow The Fenceline Railway 35.1m 0.84km<br />
Kerry & Crisma Paterson Ashburton Forks Railway 110.6m 2.6km<br />
Karl & Alison Arnesen Jessie Falls & Mt Catt Railroad 83.2m 2.4km<br />
Brian Allison Blackridge Lines 50.0m 1.45km<br />
Ross & Gwyn Fraser The Fraser Line 136.7m 3.96km<br />
Neil & Denise Wiggins<br />
Tuahiwi Valley Lumber & Mining<br />
Company<br />
90.2m 2.6km<br />
To work out the scale length multiply the actual length by your scale i.e. x 24 for 1/24 scale or 29 for 1/29 scale<br />
Page 14
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