Piko motor block - dimensions

[quote author=ge_rik link=topic=297966.msg303749#msg303749 date=1390377947]
Does anyone know the wheel sizes and spacings for this Piko motor block, please? I feel another scratchbuild coming on.

http://www.topslotsntrains.com/topslotsntrains/final.asp?ref=PIKO-36103-US-STEAM-LOCOMOTIVE-COMPLETE-DRIVE-UNIT&id=6060&manufacturer=%27PIKO%20G%20Scale%27

Rik
[/quote]

Wheels are 35mm dia, all flanged.  Spacings are 56 and 58 mm (I assumed they were the same but not so).  There is a lot of side play on the middle axle  - about 6mm.  No side rods supplied.
piko 060 dimensions.JPG

I have used two of them in these locos:
IMG_0853sml.JPG

20class n7.JPG

These are some of my comments....
I wasn’t too impressed with it once I got it home.  As usual I start off by doing some bench electrical tests.  Takes 400 mA with its wheels in the air - ie the motor and friction losses. That`s over twice Aristo blocks’ current. 

Then I tried holding the wheels to get the stalled current, but I could hear the gears slipping.  I noticed that 2 screws were missing from the top plate, so I assumed the looseness is a problem.
On the track, it couldn’t pull the skin off a rice pudding. 

At least it`s easy to pull apart.  I took the top plate off and added a bit of cardboard to provide more force onto the motor and put in 4 screws. Also no grease on any gears, so added some Vaseline.
While it was apart, I took the wheel pickups and skates off as I will use battery power. 

Once I removed the skates it was better. With 300g weight on it could take 3 bogie wagons up 1:25 easy,  taking 900mA. I only tested it at that load as it will be a small loco.

Speed worked out at around 4 to 5 kph  per volt, so 50 kph will need a 10V (8 NiMH cell) battery.

I`m quite happy with both locos operation and pulling power now.


here`s links to the 2 write-ups I did:

http://www.gscalecentral.net/kit-building-bashing-scratch-build/a-small-0-6-0-tank-on-a-piko-motor/

http://www.gscalecentral.net/kit-building-bashing-scratch-build/scratchbuilt-2-6-4-tank-loco/
 
Excellent, that's great - thanks for the info, Greg - and also the links to the two builds.

I stumbled across a book about the Davington Light Railway (http://www.faversham.org/history/More_History/davington_railway.aspx) which was built to a gauge of 1m (or 3'3" - depending which source you use) in 1916 and closed in 1918. It was built to serve a munitions factory near Faversham in Kent. Despite being only three miles long it had three steam locos and two i/c locos. The steam locos were lovely little 0-6-0 saddle tanks built by Manning Wardle. When the line closed the locos were shipped to Brazil where one still remains as a static exhibit.

5862.1153364400.jpg


A drawing of the loco in the book show it to have wheels of diameter 2'9" with spacings of around 4' and 4'3" (if my calculations are correct). Given the dimensions you've provided, I think that would make the sizes roughly 2'4" dia with 3'8" and 3'10" spacings in 15mm scale (though maths is not my strength!).

I suppose that's almost tolerable given that the deeper flanges will make the wheels look a bit bigger - unless someone knows of an 0-6-0 chassis which has slightly larger wheels and spacings????

Rik

PS - Fantastic looking models BTW!
 
ge_rik said:
A drawing of the loco in the book show it to have wheels of diameter 2'9" with spacings of around 4' and 4'3" (if my calculations are correct). Given the dimensions you've provided, I think that would make the sizes roughly 2'4" dia with 3'8" and 3'10" spacings in 15mm scale (though maths is not my strength!).

I suppose that's almost tolerable given that the deeper flanges will make the wheels look a bit bigger - unless someone knows of an 0-6-0 chassis which has slightly larger wheels and spacings????

Rik

PS - Fantastic looking models BTW!
Click to expand...

I measure the block dimensions as 37mm wheels at 55.75mm+58.25mm wheelbase, slightly different from GregH. If you model the engine in G (13.5mm/ft, corre ct for meter gauge) rather than F, you'd need 37.135mm wheels at 54mm+57.375mm - wheels are basically correct, certainly well within normal tyre wear, and the wheelbase is only a couple of scale inches out.

Jonathan
www.g-bits.co.uk
 
g-bits said:
I measure the block dimensions as 37mm wheels at 55.75mm+58.25mm wheelbase, slightly different from GregH. If you model the engine in G (13.5mm/ft, corre ct for meter gauge) rather than F, you'd need 37.135mm wheels at 54mm+57.375mm - wheels are basically correct, certainly well within normal tyre wear, and the wheelbase is only a couple of scale inches out.

Jonathan
www.g-bits.co.uk
Click to expand...
Thanks Jonathan
I knew someone with better maths would come to the rescue. I note you stock these and other motor blocks as well. The data sheets are really helpful. Thanks again.

Rik
 
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