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21mm gauge wheel & track standards
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Hello, I am building a short 3 foot [21mm gauge] line as a pilot project. I'm using the Slaters wheels. Today I'm building the first point. I can't find any data on the track or wheel standards?other than measuring the wheels. What I need to know is the flangeway clearance to use in the crossing. Back-Back: 19mm? Flange thickness: 0.5mm Back-Front: 19.5? Check gauge: 19.5 Track gauge: 20mm Wheel flange & tread: 3mm I have the parts cut and ready to go. I'm inclined to make the flangeway clearance 1mm [thickness of a wooden coffee stirrer] and see how it goes.? Advice welcome. David? |
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From: [email protected] <[email protected]> on behalf of David Rae <davidcrae@...>
Sent: Tuesday, April 14, 2020 10:07:38 AM To: [email protected] <[email protected]> Subject: [o14] 21mm gauge wheel & track standards ?
Hello,
I am building a short 3 foot [21mm gauge] line as a pilot project. I'm using the Slaters wheels.
Today I'm building the first point. I can't find any data on the track or wheel standards?other than measuring the wheels. What I need to know is the flangeway clearance to use in the crossing.
Back-Back: 19mm?
Flange thickness: 0.5mm
Back-Front: 19.5? Check gauge: 19.5 Track gauge: 20mm Wheel flange & tread: 3mm I have the parts cut and ready to go. I'm inclined to make the flangeway clearance 1mm [thickness of a wooden coffee stirrer] and see how it goes.?
Advice welcome.
David?
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开云体育David, ? Find a gauge with the right crossing/check rail details. If you have access to lathe, drill a hole through the centre. Cut the gauge in half. Tap both holes and put a bolt through. You can screw one end in and out until the gauge is right. ? I have some gauges which are a bolt with various washers on it held apart with a tube spacer. I think they were C&L but that's not the ones I've seen recently. If you can locate a source, just needs a longer bolt and spacer. ? Frank ? From: [email protected] [mailto:[email protected]] On Behalf Of Marc Dobson
Sent: Tuesday, 14 April, 2020 11:06 To: [email protected] Subject: Re: [o14] 21mm gauge wheel & track standards ? Hi David I used my 0-14 track gauge as a guide and moved the rail centres out. Marc Get ? From: [email protected] <[email protected]> on behalf of David Rae <davidcrae@...> ? Hello, ? I am building a short 3 foot [21mm gauge] line as a pilot project. I'm using the Slaters wheels. ? Today I'm building the first point. I can't find any data on the track or wheel standards?other than measuring the wheels. What I need to know is the flangeway clearance to use in the crossing. ? Back-Back: 19mm? Flange thickness: 0.5mm ? I have the parts cut and ready to go. I'm inclined to make the flangeway clearance 1mm [thickness of a wooden coffee stirrer] and see how it goes.? ? Advice welcome. ? David? |
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David,
If you imagine your wheelset going through a crossing, if the face of the flange just kisses the nose, the distance from the nose (essentially the running rail) to the face of the flange is zero. Adding your dimensions, the distance from the running rail to the back of the flange must be 0.5mm. The distance to the back of the opposite flange is another 19mm, therefore 19.5mm. The checkrail therefore, needs to be at least 19.5mm from the running rail in order to pull the wheelset clear of the nose.. Where you have two check rails, each 19.5mm from the opposite running rail, the distance over them would then be 18mm. As the back to back is 19mm, you have 1mm to play with. This can be used to reduce this clearance by moving each check rail closer to it's nearest running rail which will also pull the wheelset away from the nose. If you move each checkrail out by say 0.3mm, the distance over them is 18.6mm giving you 0.4mm clearance from the back to back, and pulling the flange 0.3mm away from the nose. So I would suggest setting each checkrail 19.8mm from the opposite running rail.??This is the check rail gauge and should always be used for setting a check rail. The flangeway is a derived figure and will vary as the gauge varies, whether by mistake or purposeful gauge widening. Or do as Marc suggests. Dave. |
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Thanks Marc, I make that 1mm which is what I was thinking?of. I can use a coffee stirred to set the clearance.? David? On Tue, 14 Apr 2020, 11:06 Marc Dobson, <marcbobdobson@...> wrote:
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I just wanted to thank Marc, Frank, Dave and John for your advice on building points in 021mm gauge. I took something from all the suggestions, which were all helpful. Point building is not my forte but it's necessary in 021 and 014 for that matter. This first one gave me practice and experience as well as meaning I have a short test track where I can try out the centre couplings. The rail is recycled from GEM TT flexitrack I bought around 1977, I think it's code 95! So quite heavy but fine for this application and try buying rail by post at present. A photo attached. The chassis is from Mark Clark. Thanks again guys, David On Wed, 15 Apr 2020 at 09:16, John C via <jclutterbuck2001=[email protected]> wrote: Hi David, |
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David,
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That looks like a noble start! I have been using Fast Tracks templates in Sn3 for constructing my O14 turnouts and track. Craig I just wanted to thank Marc, Frank, Dave and John for your advice on |
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