DIY excavator bucket adapter

[@larryperdue508]

Hey bud I see you have a whole lot of new tools 🔧 congratulations 🎊 😊

[@Tarqwak]

Avant 650i is new, all the other stuff has been hoarded over many years.

[@larryperdue508]

Just one suggestion if I were you I would exchange your loader while its still new for one with the joystick 🕹 controls I think you would be much happier 😊

[@Tarqwak]

Fully RC Avant? That would be cool! On Avant demoday I got to try out the RC excavator attachment, way smoother contollable with thumb joysticks, and it also has rabbit/turtle speed selector, was buttery smooth. Costs like €11k+tax though -.-

[@hajujajajuha2863]

I think he talked about RC controlled 260 backhoe.

[@hajujajajuha2863]

Hi, damn you made me green of envy. I only have 520 and 210 excavator. Had them for 12 years now. Very nice combo there anyway that you have! I actually have thought also to make an S30 adapter even though 210 has a non standard fitting for the buckets. I’ve thought to make a ripper to dig stumps and use S30 for that. Could be too complex. You seem to have Stahlwerk plasma. I have been thinking if I should buy their compressor and plasma, but I haven’t done it yet. What model your plasma is? What about your compressor. Is it Stahlwerk also? It didn’t sound very loud. BTW did you weld the S30 pins of your adapter with stick. They seem to be only tagged with fluxcore.

[@Tarqwak]

I'm not sure the single shank ripper on 210/260 would do much better than a 250 mm wide bucket, as the cylinders are quite small and they don't put out quite enough force for the heavy duty ripper action. Better would probably be to have the ripper direct attached to Avant coupler. I'll do a 260 push/pull force measurement video oneday... I have the multimode machine "Stahlwerk WIG TIG AC/DC 200 + Plasma S" from around 2013. The plasma part works fine but not ideal for 10+ mm plates. Ideally should get a separate 5+ kW threephase compressor but for this kind of small cuts even my ~1 kW with 24 litre tank worked fine. On the plasmacut/compressor clips I tuned down the audio -12 dB, so it was actually 4 times louder or so. The pins I left with just the tackwelds, they're not going anywhere even with those and easier to remove once the need arises, probably never though.

[@hajujajajuha2863]

I agree that Avant itself would have more power if a ripper was made for the normal work device fitting. It has much larger cylinders than those excavator devices. The problem I have had is that Avant has to be moved more if a ripper is directly in Avant. With the excavators it usually doesn’t need so much to drive around though it takes time. Thinking of a wet and soft ground and tractor type tires I have. I have 400 and 250 mm buckets and a special prototype ditch bucket for the excavator. The ditch bucket is a proto and Avant didn’t give any warranty and I use it on my own risk in the excavator. They made several years ago some of those and I bought it last year when they emptied their storages. The ditch bucket is actually better for stumps than 250 mm bucket. It is maybe 200 mm on the bottom and 600 mm on the top. It is taller then either of the normal buckets and it has very sharp sides. It also empties better than those other buckets because of the shape. I have quite a lot of clay here and especially the 250 mm bucket fills up with clay and it won’t empty itself, maybe 2/3 is filled all the time when digging clay. I’ve dug up stumps using all three buckets. The largest stumps have been of about 35 cm diameter pine and birch. Both fresh stumps. Took for awhile. The excavator couldn’t lift those. I had to roll them on the ground. I think 210 exc. has 50/25 cylinders. 50 being the inner diameter of cylinder (piston) and 25 being the diameter of the rod both in mm. Not sure though. I’ve been thinking if it was possible to switch the bucket cylinder and the boom cylinder (closest to Avant) to 60/30 if there was enough space. 210 is much smaller and lighter than 260 (about 230 kg only vs 420 kg or something). So it might not be able to handle the bigger cylinders.

[@Tarqwak]

Just did some digging in moist clay/peat/gravel mix of materials and yup the 250 mm bucket gets clogged up in ja jiffie -.- Measured the 260 digger cylinders, rod/barrel outside: Boom 32/73 mm Arm 36/73 mm Bucket 36/73 mm Turning 30/70 mm Tilt 25/50 mm Guessing the barrels have 5 mm wall thickness, then at 200 bar they apply push/pull force of: Boom 6.4/4.7 tons Arm 6.4/4.3 tons Bucket 6.4/4.3 tons Turning 5.8/4.3 tons Tilt 2.6/1.6 tons Based on: www.trelleborg.com/en/seals/resources/design-support-and-engineering-tools/hydraulic-system-calculator SolidWorks or some other similar software could be used to find out the structural load limit based on the boom material design and thicknes. Compared to the 635 that weighed ~1.6 tons and had only one 36 kg rear weight, the 650i with 180 kg rear side weights and 36 kg rear weight (total ~2.2 tons with driver + ~0.5 tons the 260 digger) is now much more stable for digging, blade and outriggers down, parking brake on and it hardly ever moves forward due to digger pulling it.

[@hajujajajuha2863]

I just hate how KZbin comment field works with iPad. Have to retype … ----- Your 260 is more powerful clearly. I googled this because I jave not registered on the Finnish Avant site to download documents. I have the needed docs on paper. shop.avant-lader.ch/out/media/Backhoe%20260-3%20a37510%20&%20a433851%202020-06-10%2009-27-07.pdf That link has the PDF of parts list of 260. The document is published in June 2020. The boom seems to be D63/32 and the arm is D63/36. The bucket is D63/36. You got the wall thickness correct. My Avant is about 1,6 tons with the driver. 210 is about 230 kg. 210 digger can’t move my Avant, but it can easily lift the front wheels up in the air if the bucket is moving downwards. Well, digging a hole in the ground. 520 model has maximum work pressure of 185 bar. Having smaller cylinders and less pressure 210 digger on 520 Avant is clearly weaker on what comes to the cylinders. I checked on trelleborg site the boom cylinder lifting force and it is only about 2,8 tons. That is the worst because it is a pulling movement. Pushing force was about 3,7 tons. But those are only the values of the cylinders. The measurements and the geometries of the whole backhoe should be considered. It depends a lot of how the triangulars are in the backhoe. I mean if the cylinder can pull with 2,8 tons how much that is in the bucket when the backhoe is reaching out the maximum. How the boom cylinder is lined with the structure of the boom. I have to do some measuring later if larger cylinders would fit …