Smifffy
Statesman
Rock'n'Roll!
Posts: 943
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Post by Smifffy on May 13, 2008 20:00:45 GMT
How important is the radius between the flange and the tread ?
The drawings for my 5" Royal Scot show this as being 3/32" = 2.38mm (approx). I have a tool that takes circular inserts that are approx 2.9mm diamter. Will this be ok, or is that radius critical ?
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Post by havoc on May 13, 2008 20:15:15 GMT
I would say it isn't that critical. That radius is important when the rail you run on is also radiused at the inside which is seldom the case in model. Then again, others may know more about it.
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Post by Shawki Shlemon on May 14, 2008 10:18:03 GMT
As said above if the track was of correct shape then the rad would be important but as most of tracks are flat bars and may have some rad(?) then it is important but you are now splitting hairs, I think you will be OK with that tool .
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Post by weldsol on May 14, 2008 14:30:42 GMT
How important is the radius between the flange and the tread ? The drawings for my 5" Royal Scot show this as being 3/32" = 2.38mm (approx). I have a tool that takes circular inserts that are approx 2.9mm diamter. Will this be ok, or is that radius critical ? Do you mean 2.9 rad as 2.9 diameter will be 1.45 rad |
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russell
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Post by russell on May 14, 2008 19:32:43 GMT
The European standard calls for a radius of 1.5 ±0.1 mm so your 2.9 diameter is pretty well spot on.
Remember that the radius should be greater than the rail inner radius so if anything I would err on the small side.
Russell.
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russell
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Post by russell on May 15, 2008 19:50:18 GMT
Sorry, senior moment! That should , of course, have read "less than".
Russell.
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Smifffy
Statesman
Rock'n'Roll!
Posts: 943
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Post by Smifffy on May 25, 2008 8:33:25 GMT
...and sloppy posting from me.
My circular inserts are 2.9mm radius, not diameter. From what you guys are saying, this shouldn't be an issue (2.9mm radius as opposed to 2.38mm).
Ta
Mark
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