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CutList - Nominal Thickness Margin Question

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Forum topic by Don3856 posted 03-11-2011 07:27 PM 1498 views 0 times favorited 8 replies Add to Favorites Watch
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Don3856

5 posts in 2093 days


03-11-2011 07:27 PM

As a test, I have drawn a component which is 12” x 12” x 0.75”. For “Nominal Thickness Margin” I have entered “3” for 3/16”.

When I run the program, I get 0.75 board footage, instead of 1.0 board foot. As I understand “Nominal Thickness Margin”, “This is used to calculate the rounding up for nominal thickness. For example if this value is 3 (i.e. 3/16), then a thickness of 3/4 will round up to 4 quarters”. In other words, my 0.75” thick board should be rounded up to 1” or 4/4 for a total board footage of 1.0. This doesn’t appear to be happening.

My hope was that I could select a complete drawing with various finished thicknesses and the “Nominal Thickness Margin” would round them up to the standard rough lumber thicknesses such as 4/4, 5/4 etc. and give my the total board footages for the various rough lumber sizes I need.

Am I misunderstanding how this should work, or just doing something wrong?

Thanks for any help,

Don


8 replies so far

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daltxguy

1373 posts in 3373 days


#1 posted 03-14-2011 09:14 PM

Don,
Thanks for your question. Sorry I didn’t notice it earlier.
By ‘running the program’, I assume you are producing the Cutlist output and not the layout output.
Nominal thickness margin applies to the layout portion which is why it is on the layout tab portion.
If you layout the board using 3/16 nominal margin, you will see, that if you choose a 4/4 board for layout (on a 12” x 2’ for example), it will indicate 1bd ft being used. I set this up and ran the tests you suggested and it did what I expected – ( but then I wrote it so it mostly always does what I expect), so if it still doesn’t do what you expect, let me know and I can walk you through it some more and help you to use the plugin for what you want to do.

I hope that helps.

-- If you can't joint it, bead it!

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Don3856

5 posts in 2093 days


#2 posted 03-14-2011 10:49 PM

Steve,

Thanks for answering. I think part of my problem was not specifying the nominal sizes of the rough lumber and specifying the nominal thickness margin as well.

What I am interested in is a list of different rough thicknesses I need to buy for a project. So, for example, if the project has several pieces with a finished thickness of 3/4” and 7/8”, the output list will show me the total board footage for 4/4 and a total for 5/4 if I use a 3/16” thickness margin. I can then multiply these totals by my prices per board foot for different rough thicknesses to get a total cost for the project (adding a place in Cutlist to enter prices per board foot and a total calculation would also be useful).

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therookie

887 posts in 2286 days


#3 posted 03-14-2011 10:52 PM

I had that same problem, and this answers my question. Thanks for posting this.

-- http://aewoodworks.webs.com

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daltxguy

1373 posts in 3373 days


#4 posted 03-15-2011 12:09 PM

Don, I’m glad that I may have accidentally answered your question.

I believe the plugin will do what you want by selecting both 4/4 and 5/4 and margin at 3/16”
For costs, at this point you will still have to add a little bit and multiply the totals given by your cost/bd ft.
I see your point when you have different thicknesses of boards, you can’t just use the total board feet.
I will consider a pricing option for future versions – it’s not a big leap from the current output produced.

-- If you can't joint it, bead it!

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Don3856

5 posts in 2093 days


#5 posted 03-17-2011 09:51 PM

Steve,

Here’s another question. I have a 3/4” thick component selected, with nominal thickness 4/4 and 5/4 selected and a nominal thickness margin of 3. This should result in a rough thickness of 1” (4/4) being used. The Cutting Diagram, however, shows the layout on a 1 1/4” board instead of a 1” board. Why is this?

Thanks, Don

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daltxguy

1373 posts in 3373 days


#6 posted 03-17-2011 10:30 PM

Good question Don. I just tried it and it doesn’t work the way I would expect. It’s not immediately obvious but I will look into it some more.

-- If you can't joint it, bead it!

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daltxguy

1373 posts in 3373 days


#7 posted 03-24-2011 03:44 PM

Hi Don,

Well, I tracked this issue down. Under certain conditions the desired margin gets added in a second time, making the part thicker than what would fit on the 4/4 board and so it ended up on a 5/4 board.
I have a fix but it’s not so straightforward as just changing 1 or 2 lines of code.
( Actually maybe it is , but I will double check – it may be as easy as removing one line)

In fact now that I figured out what I was trying to do there, I realize it probably wasn’t the best way to do it and I might just remove some code and simplify it. On the positive side, with the unused bits, there is an opening there for me to add in a feature to place more than one thin piece in a thick piece of wood. For example if you need 2×1/4” pieces and you have 1” thick boards. right now I round each piece up to 1” but it is also possible to split the 1” into 2 and use 1/2 as much wood. It’s just hard to show this on the layout.

I’ll get back to you with a workaround until I get a new version released.

steve

-- If you can't joint it, bead it!

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Don3856

5 posts in 2093 days


#8 posted 03-24-2011 05:07 PM

Hello Steve,

Thanks for looking into the problem. There’s no need for you to come up with a workaround for me, personally. Perhaps you can just build it into your next planned version.

Your idea about using thick pieces of wood for several thin pieces sounds like a good idea. And also, as several people have mention, adding the capability for entering board foot prices to allow calculation of total prices would be helpful.

I’m sure we all appreciate your efforts to enhance SketchUp.

Thanks, Don

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