Help in writing a formula or equation to create equal runs on a ladder

[jerryNYCB8]

Hope this is the right place to ask the following question?

When designing a rung ladder with equal spacing of rungs, of no less than 250mm and no grater than 300mm spacing divided equally by the overall length or height of the ladder what would the logical function be that could be created as a parameter reference? As i would be trying to do a 3d sketch using structural member add on, adjusting overall heights of different ladders for different jobs and would like the rungs to be automatically adjusted when changing the overall ladder height.   

T

[LeoWarrenADSK]

Hi @jerryNYCB8,

Which product are you using?

Thinking broadly, I would fix the pitch of the rungs, as you'll want to end up with one value that drives something.

I would recommend creating a sketch and going from there. Consider the length of the ladder, the length of the ladder from the first rung, as well as any offsets to account for the diameter of the rung - otherwise, you would have half a run sticking up above the ladder.

In CAD terms, I would be looking to use the length of the ladder as the driving parameter, which drives a pattern command for the number of rungs needed.

[jerryNYCB8]

Thanks for the Reply, Im using fusion 360. Yes i also agree that id use the ladder length to drive the run spacing. Just trying to work a value formula that would drive rung spacing when ladder length changes. Thanks

[LeoWarrenADSK]

Hi @jerryNYCB8,

I'm just following up - Did you manage to create a formula to drive this behaviour?

All the best,

[jerryNYCB8]

No, not as yet 

[LeoWarrenADSK]

Hi @jerryNYCB8,

I'm going to move this topic to our Fusion forum to help you get the best support,

All the best,

[davebYYPCU]

See if you find answers here 

The 3 plates in the message 2 were from changes in the parameter list, 

You will need some maths for the rung spacing, but this set up was for known numbers of holes.

Specify a rung distance, but I don't know how to input a range of distance.

Specify ladder length in the table and you see what you get, before closing the parameter box.

Might help...

[etfrench]

There is not enough information supplied.  Do the first and last rungs need to be spaced from the ends the same as the rung spacing?  What happens when the length of the ladder cannot be evenly divided by a number between 250 and 300?

[davebYYPCU]

I used the Ceil() function.

Might help...