| Author | Message | ||
| wrench (Metricwrench)
Registered Member Username: Metricwrench Post Number: 16 Registered: 9-2006 Posted From: 69.138.133.32 Rating: N/A |
The frame on a school bus, truck, is hight tensible steel. Any one can tell me the 1= specification? (range ok) 2= is that steel available to public? 3= an idea of price per pound? thanks much wrench | ||
| Frank Rowe (Frankid)
Registered Member Username: Frankid Post Number: 23 Registered: 10-2006 Posted From: 63.239.248.1 Rating: N/A |
It is my opinion that vehicle frames are not special steel. The frame design negates have to use special steel. Frames are often repaired using standard carbon steel. Most large steel fabricating shops can and will make repair frame sections. Welding on frames is usually prohibited as the attachment will work harden over time. I'm not an engineer, and my opinions are my own. Talk to a steel fab company. Frank | ||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 656 Registered: 10-2003 Posted From: 71.58.117.21 Rating: N/A |
I have seen advertisements on new trucks referring to the tensile strenth of the steel in the frame in thousands of pounds. You can buy steel channel rated at different strengths. Depending on what you want to use the steel for, you could probably buy the frame sections from a junked school bus cheap or similar from a truck salvage yard. | ||
| Busfool (Chuck)
Registered Member Username: Chuck Post Number: 86 Registered: 12-2004 Posted From: 206.172.106.51 Rating: N/A |
Truck rails and bus frame rails are made from a higher yeid steel. They are designed to be capable of twisting over limits not designed in mild steel components. To alter any frame using mild steel will negate any manufacturer warranty and is not recomended one should also be aware any alterations that do not meet the your government steel fabrication certification requirements could void your liability insurance. Any steel sales location can supply you with the correct materials 4140 a high strength steel no different to drill etc than any other mild steel.The frame rails are designed for specific loads and even drilling any additional holes out side the design can cause cracking as well as welding not done by a certified company. Try to avoid welding at all costs . If you want to do any additions to the frame form a larger channel that will fit over the exsisting frame and use the holes already in the frame. You can add some extra holes but keep them away from the edges and any areas where they have been bent.Frames can be repaired using standard carbon steel but there is always a risk of cracking. Remember you are going down the road in this try not to make it your last trip. I have been designing equiptment for over thirty five years and my experience repairing roll overs desiging special application vehicles and trailers tells me if not sure don't do it have some one do it that has the know how.When safety is an issue and I am not sure I will confirm with others in the buisness before I will send something down the road.Chuck | ||
| Busfool (Chuck)
Registered Member Username: Chuck Post Number: 87 Registered: 12-2004 Posted From: 206.172.106.51 Rating: N/A |
Sorry in answer to your question mild steel runs about .35 cents to .40 cents a pound and higher strength steels are on average about ten cents more. Have a steel fabrication shop make what you need they will have the materials in inventory. | ||
| wrench (Metricwrench)
Registered Member Username: Metricwrench Post Number: 17 Registered: 9-2006 Posted From: 69.138.133.32 Rating: N/A |
Thanks guys, helpfull infos. wrench | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 401 Registered: 11-2005 Posted From: 4.231.133.164 Rating: N/A |
My basic understanding of frame repair/reinforcing is that the additional metal should be the exact same strength as the original so the load is evenly distributed. A stronger doubler will take all the load from the original. If it cracks the original will then be grossly overloaded and will do likewise. Same theory as dual wheels, they need to have the exact same tires and pressures for an even load. | ||
| JJ Woden (Jj_woden)
Registered Member Username: Jj_woden Post Number: 30 Registered: 10-2006 Posted From: 71.210.42.121 Rating: |
On farm trucks and OTR trucks, frame rails are lengthened all the time. There are different materials used. I have seen new trucks come in with notice stickers saying DO NOT WELD - HIGH STRENGTH STEEL. Aluminum is also used. But aside from having to identify the material, is producing a weld and design capable of handling the weight and flex of whatever the load might be. If you have to ask very many questions, I respectfully suggest finding a competent shop that does this type of work, then do as much of the prep and teardown as you can. Gus, your theory is correct, but your example of the duals wheels raises a question. Tires are matched mostly so they roll the same distance each revolution, otherwise one will wear excessively. Size and pressure are critical, but the load distribution is secondary. JJ |
