Metal Thickness?

[BxB301]

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You need something like this for the drive matched to appropriate size hub motors

Now we're talking.
Because of the low HP of my Honda GX160 I was going to use a 6 position spool valve hooked to a double acting pump (with the 2 extra ports used to later upgrades or drivetrain)
But this (if being able to be used with 5 HP) I could hook it to two 4 position valves and get the continuous movement when using 2 cylinders.

Think that would work better?

You could do that with pneumatics if you have an air compressor. An 1800+ psi hydraulic unit sure wouldn’t take much cylinder.

Yeah, I have an 80 gallon 220psi compressor, but I'm not going to run a 600' air line to it to dig a hole for a post.

Lets talk hydraulics, what diameter cylinders and GPM should I be looking at?

I was going with a 11GPM pump because my valve choice was 11GPM, but if there are better options, Im all ears.

 

[jwmorris]

OP, How far of a reach are you wanting?

GPM, depends on how fast acting you want the cylinders. Like “X seconds from all the way retracted to all the way extended.” and is that in one axis or even if a combination (all) of them were working simultaneously.

 

[jwmorris]

I don’t know if they still have the free demo software for Working Model 2D - 2D Kinematics & Dynamics Software - Engineering Simulait but Working Model 2D is exactly what you need.

When I played with the demo, it allows you to change things on their base backhoe, locations, diameters, etc and see the effects of various loads on pressures and forces.

This is probably worth reading too.

https://ijcrt.org/papers/IJCRT2006118.pdf

 

[BxB301]

OP, How far of a reach are you wanting?

GPM, depends on how fast acting you want the cylinders. Like “X seconds from all the way retracted to all the way extended.” and is that in one axis or even if a combination (all) of them were working simultaneously.

I don't see me needing to dig more than 4' deep.
11 gpm seems pretty quick for a 2" cylinder at 14" (or whatever I measured, don't remember exactly"

I don’t know if they still have the free demo software for Working Model 2D - 2D Kinematics & Dynamics Software - Engineering Simulait but Working Model 2D is exactly what you need.

It allows you to change things on their base backhoe and see the effects of loads on pressures.

Eh, more learning?!
I suppose I'll look into it.

 

[MTGreen]

Now we're talking.
Because of the low HP of my Honda GX160 I was going to use a 6 position spool valve hooked to a double acting pump (with the 2 extra ports used to later upgrades or drivetrain)
But this (if being able to be used with 5 HP) I could hook it to two 4 position valves and get the continuous movement when using 2 cylinders.

Think that would work better?




Yeah, I have an 80 gallon 220psi compressor, but I'm not going to run a 600' air line to it to dig a hole for a post.

Lets talk hydraulics, what diameter cylinders and GPM should I be looking at?

I was going with a 11GPM pump because my valve choice was 11GPM, but if there are better options, Im all ears.

That double variable pump is intended for twin hydraulic hub motors in a skid steer setup. You would use this to drive the unit

 

[4570Man]

You could do that with pneumatics if you have an air compressor. An 1800+ psi hydraulic unit sure wouldn’t take much cylinder.

You don’t want to use air for an excavator cylinder. Air has numerous problems vs oil but the most noteworthy is it can’t operate precisely since it’s compressible.

 

[4570Man]

Now we're talking.
Because of the low HP of my Honda GX160 I was going to use a 6 position spool valve hooked to a double acting pump (with the 2 extra ports used to later upgrades or drivetrain)
But this (if being able to be used with 5 HP) I could hook it to two 4 position valves and get the continuous movement when using 2 cylinders.

Think that would work better?




Yeah, I have an 80 gallon 220psi compressor, but I'm not going to run a 600' air line to it to dig a hole for a post.

Lets talk hydraulics, what diameter cylinders and GPM should I be looking at?

I was going with a 11GPM pump because my valve choice was 11GPM, but if there are better options, Im all ears.

5 hp really isn’t enough hp for any kind of digger. It definitely isn’t enough hp for an 11 gpm pump. They have charts for that sort of thing. An 11 gpm pump producing 2500 psi needs more like 16 hp. If you’re going to keep the 5 hp motor you’d have to lower the pump to about 3.4 gpm at 2500 psi. I wouldn’t use cylinders any smaller than 2” bore, 1” rod just from a durability standpoint.

 

[MTGreen]

That double variable pump is intended for twin hydraulic hub motors in a skid steer setup. You would use this to drive the unit

Then you could use a couple of diverter units to have each pump drive two twin open SCV circuits each. One pump could drive the boom cylinder and rotation or the left stick in a traditional two stick setup and the other pump could drive the Dipper stick and bucket cylinders or the right stick in a traditional two stick unit.
If you set the two variable pumps to run off of twin treadle systems you could control The unit like a skid steer, then flip the diverter valves to bypass the hub motors and send fluid to/from the double SCV units. You would need to either lock the treadles open one direction or keep both feet on them while you use the hoe portion.

 

[4570Man]

Then you could use a couple of diverter units to have each pump drive two twin open SCV circuits each. One pump could drive the boom cylinder and rotation or the left stick in a traditional two stick setup and the other pump could drive the Dipper stick and bucket cylinders or the right stick in a traditional two stick unit.
If you set the two variable pumps to run off of twin treadle systems you could control The unit like a skid steer, then flip the diverter valves to bypass the hub motors and send fluid to/from the double SCV units. You would need to either lock the treadles open one direction or keep both feet on them while you use the hoe portion.

I wouldn’t want to have to completely dedicate hydraulic flow to the boom or tracks. It would be annoying to keep switching for one thing but you need the ability to track and use the boom at the same time. There’s a lot of reasons to do that but at the very minimum you need the boom to help it move when it’s nearly stuck.

 

[MTGreen]

I wouldn’t want to have to completely dedicate hydraulic flow to the boom or tracks. It would be annoying to keep switching for one thing but you need the ability to track and use the boom at the same time. There’s a lot of reasons to do that but at the very minimum you need the boom to help it move when it’s nearly stuck.

I absolutely agree. However, how much can you reasonably expect to do with five horsepower? You're asking a gas lawnmower engine to do the job of a 20hp diesel