Setting Z at bit change question?

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Anticipating a problem with Z hght at switch from roughing bit to finishing bit.
On a topo carve when installing the finishing bit, as long as the tip of the bit is exactly the same distance from the router base as the previous bit, I do not have to reset the Z hght, correct??

2

You should ALWAYS reprobe the Z when changing bits.

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@SamGironda
And if the carve you are doing has no area that has not been machined, what then?

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Then zero off the wasteboard for both bits

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@SamGironda , since I have yet to try zeroing off the wasteboard and am going to carve a pricey pc of maple, what i plan is to machine the workpiece to exactly 2 inches thick then probe my 1 2 3 block to set my tool Hght.
Will be able to double check it before I start milling to make certain am within tolerance. Thanks for your help, you made me think it through again.

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IF using Easel, where it does not allow the user to select Wasteboard z zeroing; I suggest using a block equal to the height of the workpiece and z probe both bits off of that block.

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@SethCNC Thanks Seth, so my 1 2 3 block idea would work fine.

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