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Fit/clearance between axleboxes and horns

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A G	06/01/2014 17:31:57
12 forum posts	I have finished machining the separate horn castings, and fitted these to my sideframes, and now come to fitting the axleboxes. How much clearance should I allow between the horns and axleboxes?? Also my horns do not appear to be exactly 90 deg to the frames, they vary by about 1-1.5 thou out of parallel, is this acceptable???
alan-lloyd	06/01/2014 19:18:34
183 forum posts	Nice sliding fit will be fine not too tight, I suggest you buy Tim Coles book Model Steam Locomotives this will give you all the info you need,
Dusty	06/01/2014 20:34:11
498 forum posts 9 photos	I would go a stage further and say an easy sliding fit, the most important bit is giving some clearance between the flanges of the axlebox. In my view 0.010 thou to 0.015 thou is not to much, they should be well radiused to allow the axlebox to cant whilst running over the track. If it is unable to cant it will bind and this could lead to serious consequences for the loco (derailing). Following on, it is just as important that the axle has some end float to allow it to move with the axlebox.
stan pearson 1	06/01/2014 22:32:56
135 forum posts 2 photos	Hi AG Dusty is spot on plenty of play if you intend to run on club tracks, same with coupling rods side clearance and a few thou play on pins except the main crank pin and conecting rod this should be a good running fit. Regards Stan

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