Sherrill Rigging Software

[TheTreeSpyder]

One of the new items in the Sherrill Catalog is the Rigging Software sponsored by them and ArborMasters. It calculates all different kinds of changes in a rigging for desktop analysis of decision examples in the field.

If picture is too small, and don't know Where the invisible picture enlargement buttons are

Rigging Software Wood and Rope Choices

Rigging Software Rig Type Choices

From :Frans's ongoing GRCS Loading Tests Thread

Following is a setup and readout of an experiment of altering the type of rigging angle, and watching the results in a 251# load of Live Oak 1' in diameter x 4.1' long.

:alien:

 

[TheTreeSpyder]

Here is a data sheet of different things changed one at a time within the Rigging Software's choices to readout the variance in forces between the different choices applied to the same size 1' x 4.1' diameter load of different species, wetness, rigging, rope type, amount of rope in the system etc.

BackGround Colors:
Yellow-'Control Group'-experiment start
Aqua-Experiment variable purposefully changed to watch results
Blank-No Change
White-Changed by program
Grey-Most Dramatic Change Noted in experiment

 

[geofore]

rigging

Nice for those that look at math like this:alien: . I like it.

 

[TheTreeSpyder]

It is all in the patterns i think; and sometimes it takes looking at the numbers to catch the pattern i think.

We've talked about how much impact a saw has on you, if dropped a few feet and caught on tether to saddle. The software lets you just enter the weight in directly if wihed without having to contrive a species/length/diameter/moisture values to come to a specific desired test value. So i placed 7# as the weight and ran different short line scenarios thru the software with surprising results. But a pattern builds if these numbers can be beleived. the last colum (S) is for tension at a pulley position, so would be ignored here.

Here i fiddled with the amount of line and line type, from the yellow start cases.

:alien:

 

[glens]

Ken, there's a saying: "garbage in, garbage out".

Obviously there are some default values for the first four criteria and/or the "software" is making incorrect assumptions.

How far is this saw falling (in a vacuum) to generate those values?

Glen

 

[TheTreeSpyder]

Fair question Glens; it ran across my mind too. One of the assumptions that sticks out in my mind is that value S(last) of pull on pulley point is always assumed to be 2x the line tension, but in diagrams of the rigs, that could sometimes be 90 degrees. Another thing is it doesn't calculate overhead rigging, or line pretensionsing etc. But is revealinjg in other areas none the less.

i think the reason noone feels those values on hip from chainsaw, is for one, not using a 19mm StableBraid tether to saddle. So much seems to be matching the line type and length of it used to absorb shock. A line less up to the task/more dynamic to the load will give less shock. From this point of view, to limit the high line tensions, one would use the weaker line,that still provided a good SWL.

Splitting a large load between 2 lines will give line tensions higher when added together than if all of load on a single line.

Orr something like that
:alien:

 

[murphy4trees]

speaking of rigging

This is one thread that refers to the rigging software I mentioned in another thread ...

 

[Greenstar]

How bout some software for common sense!

 

[Ghillie]

TreeSpyder...or anyone else who has used the software, how do you like the program?

 

[pdqdl]

While I have not checked it out yet, that looks like a Microsoft Excel spreadsheet.

It's not "software", it is only a file to opened with the program: Excel. If you don't already have Excel, you won't be able to open the file.

One big advantage here: if you are skilled at using Excel, this spreadsheet will allow you to edit the data to fit your application.

 

[tree md]

I don't have the software so I can't test to see if it will work but there is an alternative to MS Excel. It's called Open Office and it's free. I haven't found any spread sheet (or word document/powerpoint, etc) that I can't open with this program. You can DL it here:

http://www.openoffice.org/

 

[Ghillie]

While I have not checked it out yet, that looks like a Microsoft Excel spreadsheet.

It's not "software", it is only a file to opened with the program: Excel. If you don't already have Excel, you won't be able to open the file.

One big advantage here: if you are skilled at using Excel, this spreadsheet will allow you to edit the data to fit your application.

TreeSpyder was just using a spreadsheet to log the data.

Here is a screenshot of the software available from Sherrill.

 

[pdqdl]

I understand. Oops. My bad.


From the screen shot: that looks like fun to play with, but not very practical for field use. Probably real good for figuring out why you broke the bull rope and crushed that gazebo!

 

[Ghillie]

I understand. Oops. My bad.


From the screen shot: that looks like fun to play with, but not very practical for field use. Probably real good for figuring out why you broke the bull rope and crushed that gazebo!

No bad, I was a little confused at first. I started going through the program files looking for a spreadsheet.

It does look like it was built using Access as a data base.

No I haven't used it in the field, but it may come in handy using it to run ideas the night before a big job, or just to check how much you've stressed a rope and how many cycles you should have left.

It's part of my OCD about playing with ropes and numbers. Just like the artillery loop had me going nuts.




BTW: I love making spreadsheets with Excel!!