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Small Cabinet #8: Getting ready to do the doors - Math question

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Blog entry by Betsy posted 02-28-2009 03:47 AM 1123 reads 0 times favorited 15 comments Add to Favorites Watch
« Part 7: Poorly drawn - but getting closer Part 8 of Small Cabinet series Part 9: Hey, hey, hey --- look what I did boys and girls!!!! »

OK – so now I’m ready to tackle the doors. I plan to do raised panel doors off the router table. I’m using a CMT set of panel cutters. There is a calculator to determine sizes of the door rails/stiles here http://www.cheyennesales.com/download/rpdcalc.htm

However, I can’t get it to work. So I’d rather just do the math myself – but I can’t find the formula to do the math with. If someone can give that to me I’d appreciate it.

If I keep at it, I just may get this project done.

Thanks in advance.

-- Like a bad penny, I keep coming back!



15 comments so far

View Napaman's profile

Napaman

5365 posts in 2797 days


#1 posted 02-28-2009 03:58 AM

my wife is a math teacher…we can help with the math…but we are not sure what formula you need….PM me if you need help once you get the formula…

-- Matt--Proud LJ since 2007

View Betsy's profile

Betsy

2914 posts in 2616 days


#2 posted 02-28-2009 04:01 AM

Thanks Matt. I know there is a formula – I used to have it. But, while I am quite organized and can put my hand on any document at my office, doing so at home is not quite so easy. It’s not a complicated formula—just can’t come up with it. I’ll let you know what I find.

Thanks again.

-- Like a bad penny, I keep coming back!

View davidroberts's profile

davidroberts

1003 posts in 2206 days


#3 posted 02-28-2009 04:38 AM

worked fine for me. just change the value in the yellow highlighted cells labeled door height, door width. or just post your numbers and i’ll input for you.

-- God is great, wood is good. Let us thank Him for wood......and old hand tools.

View lew's profile

lew

10127 posts in 2475 days


#4 posted 02-28-2009 04:45 AM

Betsy,

I tried the calculator from your link and it seemed to work OK for me. I’m using Office 2003.

I did notice that the blue numbers on the left never changed. Only the numbers in the “cells” for the different dimensions were modified as I changed the door dimensions.

Lew

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View Betsy's profile

Betsy

2914 posts in 2616 days


#5 posted 02-28-2009 05:00 AM

I’m not sure why I can’t get it to work.

But my dimensions are:

Door width opening 9.25 with 1/2” overlay would make it 10.25 wide
Door height opening 16” with 1/2 overlay would make it 17” for the stile height

I plan on using 1.5” rails and stiles. (3/4 thick)

I can’t figure out why I can’t get the calculator to work. I can put in my numbers but then I get error!

-- Like a bad penny, I keep coming back!

View davidroberts's profile

davidroberts

1003 posts in 2206 days


#6 posted 02-28-2009 05:22 AM

I cut and paste the values from the site. You can thank the creator of the website, very handy.

Door Width Door Length
10 1/4 17

Door Parts Cutlist

Rails
Width Length
2 7/16 6 1/4

Stiles
Width Length
2 7/16 17

Raised Panel
Width Length
6 13

-- God is great, wood is good. Let us thank Him for wood......and old hand tools.

View Betsy's profile

Betsy

2914 posts in 2616 days


#7 posted 02-28-2009 05:24 AM

Dave – think I can use that as well. But I was hoping I could get that calculator to work so I don’t mess up the calculations. I’m going to have one of my computer friends take a look at the program on my computer to see what the problem is. But in the mean time – the manual calculations are just fine. (By the way Dave – I’ve not given up on SU yet!)

Thanks!

-- Like a bad penny, I keep coming back!

View Betsy's profile

Betsy

2914 posts in 2616 days


#8 posted 02-28-2009 05:25 AM

Thanks David – all the LJ’s rock for giving help!—- What does the calculator say if you want to use 1.5” rails/stiles? Or do you all think that’s too small?

-- Like a bad penny, I keep coming back!

View lew's profile

lew

10127 posts in 2475 days


#9 posted 02-28-2009 08:12 AM

Betsy,

It looks like the calculator is designed to have very limited variables- door width and door height. The cells that contain the stile and rail widths cannot be changed. The folks who designed this spreadsheet locked those cells and password protected it.

Lew

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View Betsy's profile

Betsy

2914 posts in 2616 days


#10 posted 03-03-2009 04:21 AM

Thanks Lew. Will have to do the math. Shouldn’t be too hard once I get down to it.

-- Like a bad penny, I keep coming back!

View tooldad's profile

tooldad

657 posts in 2435 days


#11 posted 03-03-2009 04:33 AM

The workshop calculator from Rockler is a great program. Usually $20-25, however I picked it up on sale for $5. It does arched, straight, multi-panel, and even wainscoating calculations. You can change the cutter depth, overlap, single door double door, etc.

I am a little more simpler when I calculate. My method is assuming you have added the overlap. Stile frame length is same as door height. The Rails are (2*(stile width) – Door width + 3/4” (assuming your tongue/groove is 3/8” which is standard on most cutters. Then I just dry fit and measure the panel from measuring from the edge of the profile (which is same depth as groove) and then subtract 1/8” for expansion.

View tooldad's profile

tooldad

657 posts in 2435 days


#12 posted 03-03-2009 04:35 AM

Also 1.5 stiles/rails in my opinion is too narrow. I limit my students to 2” min. My standard is 2 1/4” 1.5” is fine structurally, however when you figure in 3/8” profile on the inside and usually a roundover or some sort of profile on the outside, then the flat part gets really narrow. Also you need to have that width of the flat area for the knob if you want one.

View tooldad's profile

tooldad

657 posts in 2435 days


#13 posted 03-03-2009 04:41 AM

Last comment, from workshop calculator. Here’s your answers

Stiles (verticle) 3/4×1 1/2×17
Rails (horz) 3/4×1 1/2×8
Panel (no deduction for expansion) 3/4×8 x 14 3/4

I have it set up for no panel reduction since sometimes I use 1/4” ply. I just cut a little smaller on raised panels.

You won’t regret purchasing the program if you make a lot of raised panels. PM me your email and I will send you the pdf it created for the workshop.

I only did one door. You can do an entire project and it will generate a cut list for stiels/rails separate from panels. and it will combine all into one and calculate board footage needed. A lot of goodies for $20.

View Betsy's profile

Betsy

2914 posts in 2616 days


#14 posted 03-03-2009 04:56 AM

Thanks ToolDad!

Another question then. If 1.5 is to narrow – I was thinking that would be about right for a cabinet this small. I’m just wondering if you think my panel will be to small if I go with a bigger frame. This whole project is not very proportionately correct – but it fits the space and the requirements of my friend. But sure would be nice if I could make it look a bit better.

Your opinion is appreciated!

-- Like a bad penny, I keep coming back!

View tooldad's profile

tooldad

657 posts in 2435 days


#15 posted 03-03-2009 05:05 AM

Kind of a wash whether you use 1.5 or 2” frames. I would run a test piece with and put the outside router profile you desire just to get a look at it. I did a small box and used 1.5” frames, so not saying you can’t use that narrow.

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