Front-End Loader Comfort Ride

[Smokeydog]

Are you saying that they try similar options by actually making a FEL and trying it? Or by modeling one on a CAD program?

If it's physically making one up - which I kind doubt these days - but if so I'll take that bet, and hope someday to collect.
It seems to me that there is no cheaper way to design than in CAD. Way less expensive than fabricating and testing.

What is surprising me is not yet seeing ads from people selling completed model files of common mechanical designs. It seems like a reasonable type of business. As an example, using a dynamic model file of something like our M59 FEL makes designing a new style of bucket much easier.
There are a number of makers of specialty attachments for tractors. I wonder what would be a fair price for a working model file like that? Or is every company making their own?
rScotty

Make mine donuts.

Daynamic loads are hard to calculate given real world infinite variables. We (ORNL) had the world’s fastest computers and best minds still learned from prototypes and crash testing.

Manufacturing line improvements from failures is common.

Kubota has a long history of experience of what works and how things fail. I’m sure they use the past and present technology to their advantage.

Seen many ideas and changes sketch on break room napkins.

In the realm of the modifications I do I’ll take experience over youth every time. A measured value over a calculated value. I can easily over engineer 10-100X and not worry about cost.

I’ll buy the donuts.

 

[jonsstihl]

I wasn't really surprised by the pressures but I really didn't know what to expect. The most surprising thing was that the pressure is actually higher when lowering the loader than when raising. at first it didn't make sense but if your pressure dropped to zero when you moved the joystick the loader would drop way too fast. Now if anybody knows how the loader valve does that I would be interested to know. I don't think it is like the regen curl circuit so they probably go with some kind of restriction in the spool valve in the lowering direction on the return to tank side but i'm just guessing

Considering the snowblower is my heaviest attachment and it weights less than half the 3pt hitch capacity I am kind of surprised because I feel the tractor squatting when I pick it up even with 20 PSI in the rear tires. can't imagine what it would feel like to pick up double the weight. would definitely need a ton of weights on the front if I didn't have the loader.

I think we would be surprised at how many companies buy a competitors product and reverse engineer it or experiment.

pressures where taken at normal ride height because they do vary with height due to geometry and the purpose of the accumulator is to dampen shocks when travelling so loader pressures where taken with the cross tube just below the headlights.

 

[jonsstihl]

I have seen a situation at work where a bracket would crack. the solution was to make it thinner not thicker. seems counterintuitive if you don't understand the problem. the bracket was cracking due to harmonic vibrations and had no load on it in operation.

 

[Smokeydog]

I don’t know how but my M59 loader does the same pressure increase when lowering a load. Actually a slight load on the engine. Figuring it gives a safer control when lowering. Much appreciated handling feature.

You can really see significant lowering of pressure spikes between having the accumulators valved in or out. Feel the difference too.

Picking known weights at the same point was very repeatable to develop a weight vs pressure curve. Any variations in lifting point, materials in grapple or bucket invalidated the curve. Maybe logs cradled in the grapple, curled all the way back and same height could be measured?? Would be a different curve to calculate.

Grubbing, digging, pushing and curling can easily exceed lift circuit pressures over pump relief. No relief protection in a closed valve to cylinder circuit.