Tab thickness

[Rob Davis]

This is the third time this has happened so I am beginning to think it might not be attributed to my error and maybe I am missing doing something to fix it.
I am attaching a cabinet that has this situation. We were using up imported prefinished 3/4" plywood which was 0.710 thick and on certain cabinets we used another material of Cherry one side and maple other side because the exterior of cabinets was Cherry and interiors were maple. The Cherry/Maple plywood was 0.750 domestic plywood and we just selected in Constr Settings whatever side or bottom the correct material, etc. What happened was all the cherry/maple plywood had tabs for blind dadoes that were too thick. They appear to be 50% of the 0.750 and the slot in the other piece was 50% of the 0.710. Obviously, we had trouble getting them together without thinning the tab.
What did I miss that would have made these tabs be correct? Should I be "fixing" the tab thickness dimension somewhere so it cuts it to a certain size no matter what? I think it is using 50% of material thickness but that won't work for varying material thicknesses. The problem of mixed materials has not surfaced when we use a 1/4" back panel for example but we would normally full dado that in, versus blind dado so the tabs aren't there.
Just trying to perfect the process as we really liked how this turned out except for these tabs. 41 total sheets and while only 6 sheets were Cherry/maple, it still was every one of these parts had to be reworked.

[Ryan Hochgesang]

Rob,

When you create a .twd file in eCab, it is best that you choose to change material thickness if the thickness will be fluctuating from the actual thickness that you've entered in material setup for Preferences and Settings. By choosing to change material thickness when creating the twd file in eCab and inputting precisely the thickness of stock being used, this will ensure a better fit on your Blind Dados/Tenons.

[Forrest Chapman]

Rob,

You might want to recheck which parts you are trying to fit together. If you nest in ecabs just the cabinet you posted you will find that all the tenons are the correct thickness for the matching dados. How it is machining is another matter as I'm not there. The tenons on the bottom are going to be 50% of the material thickness ie. .75/2= .375. If you add your clearance of .015 to the joint your dado will be .39. As I stated the nest shows correctly. Since the top is a different thickness (.71/2=.355) make sure you are not trying to fit the wrong parts together.

Hope this helps,
Forrest

[Rob Davis]

I am missing something here so any help is appreciated.
I can take my cabinet, put 0.040 "fit clearance" and 0.040 Depth clearance into Construction Settings, hit OK and it reconstitutes the cabinet. Then I double click the whole cabinet, go to measurement window, measure the nodes for the tabs and for the slots, and they both measure exactly 50% of my material. (In this test case, 0.250") Shouldn't one of them be 0.040 different? OR is this only after you nest it or write TWD file? I am trying to measure the tabs "virtually" for fit clearance but according to this, there is 0 tolerance or clearance, even though I have already set it to have 0.04".
Is there a way to actually see this on screen? What am I missing?

cab is attached if interested.
I am now running V6.