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#1
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BSF is the fine thread as opposed to whitworth which is the coarse British thread. both have a 55 degree included angle.with a rounded valley, and flat crests, while UNC/UNF have a 60 degee included angle, with flat valleys and flat crests. Thats how I understnd it anyway.
On thread forms. A turned thread from a lathe etc, will not be as strong as a roll formed thread (which the originals probably were) because the "grain' in the metal is cut by the lathe tool, whereas the grain in the roll formed thread follows the profile of the thread. I think many "British Motor Lorries" have used 7/8 BSF threaded wheelstuds.(often 10 stud)
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Bluebell Carrier Armoured O.P. No1 Mk3 W. T84991 Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6. Dodge WC55. 37mm Gun Motor Carriage M6 Jeep Mb #135668 So many questions.... |
#2
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I'm with you that I wouldn't choose a cut thread for maximum strength, but I might be willing to turn the head of a rolled bolt to make a mushroom or tapered head to weld to the rim. After all, the metallurgy can be altered by the act of welding the stud in place onto the rim so this might not cause a serious loss of strength. Also, the weld is as much to stop the bolt from turnig as it is to stop it pulling through the rim. |
#3
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Dormer still lists a die in their catalogue.
http://www.dormertools.com/ It is on page 23 in the catalogue. http://www.dormertools.com/sandvik/2...et/s003591.nsf F350 BSF TPI e-Code 7/8 11 22.23 2“ 5/8 F3507/8X2 ● Adjustable Dies ● Paul |
#4
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what Lynn was saying about rolled threads is correct.But would the high speed ball milling of the cnc making a round bottom thread root create the same kind of stress riser as a lathe cut thread?They should also be post forming heat treated too right?hmm....
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#5
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lwdparts have some studs nos, if they are the right ones,
i would not worry about the welding in as the original metal was probably very poor anyway compared to today, i would use allen bolts if i was really worried. and fit a collar on the end, and weld that in. regs rupert |
#6
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As comment, they did experiment with press in studs on the CMP wheels and found that the wheel material was too thin to properly hold the studs (hard to believe when we see how heavy the CMP wheels are compared to modern, but they ran tests and had failures...) so they found they had to keep the welded in studs. |
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