Pins and tails don’t align for box lid but OK on sides

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Pins and tails don’t align for box lid but OK on sides

Postby BretC » Sun Nov 17, 2019 11:54 pm

F8B1BA09-3760-443E-B81D-830E605666E8.jpeg
Box sides
F8B1BA09-3760-443E-B81D-830E605666E8.jpeg
Box sides
Group:

I am attempting to make four sided boxes with dove tail joints on all four sides and also the top and bottom.

In my first attempt the sides fit well as well as two sides to the top and bottom, however two of the sides did not align with the top or bottom. Please see the photo’s.

What I believe went wrong is that the material thickness was deducted from two of the sides. Assuming this was the cause of the problem, what is the correct sequence when creating dove tail joints on a six sided box?

Thank you.

BretC
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46A2550E-B9E7-492D-9AB3-1170F3D241D4.jpeg
967A27B6-8065-4733-91F9-A7E27171922B.jpeg
Tails and pins not aligning
Last edited by BretC on Mon Nov 18, 2019 12:01 am, edited 1 time in total.
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Re: Pins and tails don’t align for box lid but OK on sides

Postby jimandi5000 » Mon Nov 18, 2019 12:00 am

Looks like you need a bigger hammer... ;)
Thanks,
Jim
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Re: Pins and tails don’t align for box lid but OK on sides

Postby BretC » Mon Nov 18, 2019 12:06 am

Thanks Jim :wink:

Maybe I now know why I have not seen many six-sided boxes using the dovetail gadget. Most I have seen are only four-sided. I am sure the problem is something to do with the thickness of the material when the pins and tails are calculated.
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Re: Pins and tails don’t align for box lid but OK on sides

Postby jimandi5000 » Mon Nov 18, 2019 2:29 am

Hi Bret,

From my view point, the Dovetail is a joint that is best when the tail is in a pull state, like in the front of a drawer. Looking at the bottom, the dove tail it strength is pulling the sides and less on the keeping the bottom on. (I know the bottom will not fall off)

Do you need help? Is this a gadget? If so, can I help with the code?
Thanks,
Jim
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Re: Pins and tails don’t align for box lid but OK on sides

Postby BretC » Mon Nov 18, 2019 2:34 am

Jim:

Thanks for the help. Yes, I agree with your observation about the bottom not being in a "pull state." Consequently, the dovetail may have marginal structural value, but I wanted to do it because it is "cool" and it would add to the mystique of the Christmas gifts that I am making. Yes I am using the Dovetail gadget.

Thanks

Bret
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Re: Pins and tails don’t align for box lid but OK on sides

Postby adze_cnc » Tue Nov 19, 2019 10:54 pm

jimandi5000 wrote:Looks like you need a bigger hammer... ;)


As in "if it doesn't fit, you haven't hit it hard enough"?

Steven
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Re: Pins and tails don’t align for box lid but OK on sides

Postby BretC » Thu Nov 21, 2019 2:05 am

I started a new six-sided box in Vcarve and believe I corrected the problem as well as found the source. Although I have not cut it out yet as I am waiting on new bits, the computer model in VCarve Pro looks promising.

Here is what I learned when designing a six-sided box. The creation of the dovetail joints on a six-sided box must be done in the following sequence.

#1 Create the dovetails on the tops and bottoms of the sides FIRST
#2 Create the pins in the top and the bottom SECOND
#3 Only after the top and sides THEN create the dovetails in the sides
#4 Finally, create the pins in the sides

After I successfully cut the next six-sided box using the dovetail gadget, I will then post an update with photos.

The above sequence is missing from most online videos and tutorials.

BretC
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