CDP BACKHOE BUILD

[Iplayfarmer]

The side your welding on will expand and probably tilt the top of the bracket outward.

I thought it was just the opposite. I.e., you lay a bead down hot and as it contracts it pulls that side inward. This would support what both SlowmanDown and Dave have said. They both said that they had to pry and bang becaus the box ended up being too narrow: The top tilted inward.

 

[J_J]

I haven't seen what he was welded on, and which side first. The steel should bend away from the heat. If you heat a flat bar, say 1/4 in x 2 in x 6 ft long in the middle center about 8 in on one side, I will almost bet that the ends of the steel will bend away from the heat side. Molecules expand when heated and push. That's my story and I am sticking to it.

I would tack at 4 or five spots. Even on the first tack, a bracket will move out of alignment. If it does, you have a chance of correcting the lean. A bolt through the whole assembly should keep things in alignment.

If you look at the top rails, on, say a landscape trailer, you will notice that a lot of the top rails are not straight and true. This is because of the welding on the bottom side of the rail for the vertical ribs. They usually always bent outward. I was welding up a top rail once, not know any better, started from the front and started welding the vertical ribs, I didn't secure the end of the 16 ft top rail, and the end moved out of alignment about 1 in per rib. After the third rib, I got wise and pulled the end piece back and welded it. That's where I learned to do a little bit here, and and a little bit there. If I would have tacked everything in place first and come back and weld at different places on the trailer, It would have come out better.

 

[SLOWMANDOWN]

Ok, I will try to clarify what I will be assembling next. By the way put together the swing and pivot assembly and now it works ok. J_J the boom tubes are 3 x 3 inch tubes and the bushings are 3 inch they do not protrude as I previously explained they are like yours. As before the boom plates are what will be welded next which are only tacked into position presently. The markings in red in the attached picture illustrate where I will weld next. I suspect that the warpage will accrue when the welds cool and contract and actually pull towards each other, which maybe caused by expansion I don稚 really know. Certainly there is an ample amount of movement of molecules as they super heat up and realign themselves as they cool. I appreciate all the comments and help, keep them coming. I do like the idea of not tacking the bushings until the part is completely welded. This is not how the plans state, but seems to make good sense.

 

[SLOWMANDOWN]

I've got a tortion axle for the towable section of the backhoe. I will be working on this section this weekend if my hubs come in time. The torsion axle spindle is offset from the axle by an arm of approximately 4 to 5". My question is that should the spindle be towards the front (hitch) or toward the back. Have not been able to find installation instructions. Need help

 

[J_J]

I've got a tortion axle for the towable section of the backhoe. I will be working on this section this weekend if my hubs come in time. The torsion axle spindle is offset from the axle by an arm of approximately 4 to 5". My question is that should the spindle be towards the front (hitch) or toward the back. Have not been able to find installation instructions. Need help

They hang to the rear.

Select Torflex installation

Dexter Axle - Trailer Axles and Running Gear Components - Torflex Axles

 

[SLOWMANDOWN]

Great, thanks.

 

[washita]

ok my .02 worth (20+yrs welding/fabricating) j j has given you a lot of good advice only thing I can add is if in doubt weld it so that if it does warp you can press it TOGETHER , trust me it is easier than trying to spread something apart later (made my own warranty hammer,short handle,#10, it fixed everything except ignorance) most common mistake usually seen is too hot and too fast of wire speed, relax burn it in good and steady ( welded 3/16 treadplate to 3" channel 96" long continous bead not too hot welded slow did not warp and was not clamped to any fixtures)

 

[David Devuono]

Hey David, I was woundering if your hydralic guy had another 6 spool hydraulic valve at the price you got yours. Thanks for your reply.

Sorry I missed this message, wasn't ignoring you. Are you in Canada? Drop me an email off line thedevuonos@rogers.com I know the place has mail order so perhaps if they have one, they can ship it to you?

 

[J_J]

SLOWMANDOWN.

Did you ever weld those center plates as in post #53, and if so, what effect did you notice?

 

[SLOWMANDOWN]

No J_J sorry! Been tied up with other chores arround since snow melted, iching like mad to get back working on it but wife has organized a party next weekend with a monster "to do list". Looks like I'll be busy till mid may.