Compact, durable, high - load XY Table? 1

[NadavH]

Hi
I'm looking anywhere for a linear stage capable of supporting a vertical load of up to 7500N and move it in two directions, while also being durable to dust and dirt to work in the field.

any ideas on what kind of product, actuator, or sliding mechanism is best for it?

 

[BrianE22]

You could use dovetail ways or linear bearings to guide the table. Dovetails will handle high loads but have more friction. Both should be sealed with bellows. I would call it a 2-stage or 2-axis table. You can drive each stage indirectly with a lead screw and motor. Or you could drive each stage with a direct drive linear actuator.

Speed, accuracy, backlash, over-turning moment capacity would all need to be considered.

 

[EdStainless]

For that kind of load there are a lot of questions.
What is your idea of compact? 2' or 8'?
Will the load be well balanced (centered)?
What about vibration, tipping, lateral forces?

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[IRstuff]

What kind of dust/dirt/field? Are we looking to do CMM in a field of mud?

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[NadavH]

Thank you all. the design is an enhancement to an apple harvest machine as part of the unloading proccess. the load is a 500KG container and should be well centered without any significant vibrations or lateral forces.

 

[IRstuff]

Must we continue to drag information from you? How much travel, what kind of travel, how often?

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[NadavH]

Hi,
For Travel about half a meter distance in each direction (X and Y), in a continous and reciprocating motion type for a few hours each time.

 

[BrianE22]

Reciprocating as in a "circular" path? Sounds like you need coordinated motion from your 2 axes. That would drive up the cost of the controller. What sort of acceleration and velocity? The acceleration and the mass and the height of the mass will allow you to calculate the moments on the slides.

 

[IRstuff]

How fast, and is it circular, or Lissajous?

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[GregLocock]

For ag I wouldn't bother with anything other than hydraulics and wheels running in c section rails. I'm guessing you are trying to evenly load apples into the box, so precision is not required, +/-25mm would be good enough.

Cheers

Greg Locock


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[NadavH]

Greg Locock, great! That's pretty much it
thanks a lot

 

[dhengr]

NadavH:
I agree with GregLocock’s approach. Except, you might consider double flanged stl. wheels on narrow rails, or vee-grooved stl. wheels on an angle iron with the legs down. These rail arrangements shed dust, dirt, twigs, etc. better than a channel would. You need a table on wheels, on one set of rails on a frame; which is inside a second/lower frame with wheels and rails. You likely have the hydraulics on the tractor already.

 

[3DDave]

Ignoring the Z-axis, look at

https://en.wikipedia.org/wiki/SCARA

as an example. A couple of hydraulic cylinders could drive it and there are no exposed tracks or rolling wheels. One could use large tapered bearings at each vertical axis. The plate can have its own actuator and axis if that's an important independent control to have or a push-pull cable could probably manage to maintain a fair control on orientation.

 

[GregLocock]

Yeah a pulley wheel running on ^ rails is a better idea. A coarse chain and a hydraulic motor might be a more compact solution than a ram.

Cheers

Greg Locock


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