.2 back with .25 bit ??

Kenneth Rychlik · Post by **Kenneth Rychlik** » Sun, Dec 06 2009, 3:41PM

Is there a work around for cutting a rabbet for a .2 thickness panel with a .25 bit for a cabinet back? I tried using a .3 thick back and a nagative .1 back offset, but the nest still only shows cutting the rabbet at .2

Thanks

Kenneth

Jim Carter · Post by **Jim Carter** » Mon, Dec 07 2009, 5:06PM

I do not understand question.

Kenneth Rychlik · Post by **Kenneth Rychlik** » Mon, Dec 07 2009, 10:12PM

I am cutting cabinet parts with ecabs and want the bit to cut a rabbet by going off of the part by a little bit. By making a wider dado and hanging the dado off of the edge of the part, it would work, but the software won't allow it. I am running a shopbot with the ecab link.

KR

Dennis Englert · Post by **Dennis Englert** » Tue, Dec 08 2009, 8:35AM

Kenneth,
If I understand what your question.

To accomplish this, I think that most would make the back in eCab's with .25 material, but load the .20 on the machine. You'd get your 1/4" rabbet that way. That is probably the easiest.

Another method would be take the components in the Part Editor and design the rabbet. More work.

Dennis

Kenneth Rychlik · Post by **Kenneth Rychlik** » Tue, Dec 08 2009, 9:10AM

Dennis, I am ok with cutting the back. My trouble is cutting the rabbet in the cabinet side for the back withought changing bits. This is a simple machine with no tool changer, so I want to cut everything with one bit. In the design software, I can make the back rabbet/dado work by making it larger (.3 dado) and then giving it a negative back offset (-.1) . I can get the .2 back rabbet that way on the design, but the ecab link for the shopbot won't cut it this way. It goes back to the smaller .2 back dado and tells me I don't have a small enough bit to cut the part.

KR

Jim Carter · Post by **Jim Carter** » Tue, Dec 08 2009, 11:49AM

Could the problem be with a setting of 0 for the collar in the nesting? And the router not able to cut a .2 dado using a 2.5 bit because there is no room for the .5 to hang over the side panel back edge.

Kenneth Rychlik · Post by **Kenneth Rychlik** » Tue, Dec 08 2009, 3:13PM

I'm pretty sure it's a design issue with the software. It's not made to make cabinets the way I'm used to in another program I guess. All of my dado's ran past the edge of the cabinet to where I could have clean exits instead of having to clean up all the pieces manually.

I may have to settle for a different design, but wanted to see if what I wanted to do was possible.

Kenneth

George Davidson · Post by **George Davidson** » Tue, Dec 08 2009, 4:30PM

I am losted when it comes to CNC or the shopbot Would it help if you made your own tool in e-cabinets or made something in a Cad program

Kenneth Rychlik · Post by **Kenneth Rychlik** » Tue, Dec 08 2009, 6:40PM

George,

Basically I want to have my machine cut down the edge of the part with some of the bit cutting into the edge of my part and some of the bit hanging off of the part. This is before the part is actually cut loose from the sheet. i can't get the program to do it so far, but I'm still trying.

Kenneth

Gary Puckett · Post by **Gary Puckett** » Tue, Dec 08 2009, 7:30PM

Can you put in a program stop and do a manual tool change?

Gary

Kerry Fullington · Post by **Kerry Fullington** » Tue, Dec 08 2009, 8:27PM

Kenneth,

I used a 1/4" material in eCabinets for the back and gave it negative 1/16" back inset and the nest shows a 3/16" rabbet.
Would this work or does it create another problem?

Kerry

Kenneth Rychlik · Post by **Kenneth Rychlik** » Tue, Dec 08 2009, 10:33PM

Gary, I'm trying to get away without the manual tool change. I have run these parts in another program that allows this, but am trying to get ecabs to do it. In the other program I have to manually make each part and it's a pain to use.

Kerry, I did that with the negative offset but when nesting in the shopbot link it tells me I don't have a bit small enough to make the cut. I ran the part just to see and it does not cut the rabbet at all with a .25 bit in the machine. It won't let it hang over the edge. It reverts back to the .2 dado and ignores the thicker back I had designed it with.

In fact you can take the cabinet you designed and nest it. It will show the 3/16 rabbet.

I want it to show the 1/4 inch rabbet haning off of the edge of the part so it will let me cut it with my 1/4 inch bit.

Right now oversizing the cabinet and taking it to the table saw to trim it is the only solution I have come up with. That kind of defeats the purpose of having a cnc cut your parts though.

Thanks for your thoughts

Kenneth

Kerry Fullington · Post by **Kerry Fullington** » Wed, Dec 09 2009, 7:14AM

Gary,

Use your 3/16" material for the back
Give the back a negative 1/32" inset
In Construction Parameters for the back use a 1/32" fit clearance.
This should make the machine think it is going to cut a 1/4" dado to cut the clearances.
I think that you can play with the fit clearances and get this to cut.

You might try a negative 1/16" back inset and 1/16" clearances.

Kerry

Daniel Vonderheide · Post by **Daniel Vonderheide** » Wed, Dec 09 2009, 9:24AM

In ecabinets, place a .25 back on the cabinet and oversize the depth by .05. Take each side into the part editor and use the rectangle tool to create a pocket on the dado's outside that is .05 wide. Right click and then choose "cut pocket using geometric shape". Do not do a cut through. Cut to a depth that is .001 less than your material. If your sides are .75, cut to a depth of .749. I have tested this with the shopbot link and it seems to work correctly. I have attached the sample cabinet and twd file. I hope this helps.

Daniel Vonderheide · Post by **Daniel Vonderheide** » Wed, Dec 09 2009, 9:25AM

one file at a time..........

Thermwood / eCabinet Systems

.2 back with .25 bit ??

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