Tractor backhoe - homemade

[BFreaky]

This material comes in a hardened and ground state, at least here. I will try to weld it as you said although I did it before but the welds were not so thick as you mentioned. Problem is I don't have line boring machine or bohrwerk and the welds tend to pull...usually I put all the bushings in place, push a pin through and weld it all in place. Most of the time it's precise enough but ofcourse it's better to fine drill it after all the welding is done. At this point I have no other way to do it

 

[Renze]

Are all your pins the same size ? Then you can make the holes 0.5mm undersize, and buy one or two hand reamers to ream them to a fitting of minus zero, plus a few hundreths (H7 fitment reamers are most common)

 

[Renze]

Google Image Result for https://i.ebayimg.com/images/g/V3wAAOSwB-1YSWJ/s-l3.jpg

You can also get adjustable reamers, but setting the diameter takes precision and the diameter adjustment range still is maybe a 10mm or so

 

[BFreaky]

Yes, 45 mm. Except main pin which is 60 mm. How would I align it through both holes 120 mm apart?

 

[sixdogs]

I hope new one will be even better...at least that's the idea

No doubt it will be. Any idea of total build time in both in hours and months?

 

[texasranger556]

Yes, 45 mm. Except main pin which is 60 mm. How would I align it through both holes 120 mm apart?

Have you looked into building a line boring rig?

 

[BFreaky]

Yes, I may just build one. I've got an old drill press which could maybe do it.
Sixdogs, I'm still in prep mode, build did not start yet. I'm waiting till I gather a pile of parts then it's on

 

[11B2620]

Curious if you could explain the electric joystick? Looking into making my backhoe with two mechanical joysticks into the same on a small excavator, all electric. I was trying to figure out your amount of levers and how you were saying about being able to switch something??

 

[BFreaky]

I will use 2 joystick levers connected with metal cables (1st picture) and electric diverter valves so each function can be diverted. All you have to do is hold a button to switch between cylinders. I can draw a schematic if you want

 

[rScotty]

Everything . The point is to have hard pins to get as much uptime as possible. Bushings are cheap and can be replaced quickly but pins are not

Well, hold on here. There are plenty of machines that use the hard bushing and softer pin philosophy. I don't believe it is such an obvious decision. There are also sleeved bushings available and the ease of repair by small shops to consider. Not to mention the initial cost and that different soils will abrade in different fashion. In my mind there are advantages both ways.
rScotty