# Retract hight and setting zero

Greetings!
After finally getting my feet really wet, I have some questions about retract hight and setting zero at the bottom of the stock.

First: Where do the retract hight measure from? Always from zero or is it from the top of the stock regardless of zero at the top or bottom?

Second: If zero is set to bottom of stock, would you need to take that into account when setting cut depths? I.E negative values? I want to set zero at the bottom and set the stock hight to slightly higher than the actual stock. Then i can run a pocket or facing operation down to a known hight.

Best regards!
Btwâ€¦ This is soo fun!

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Retract is from the top of the stock.

In Carbide Create (and Iâ€™d imagine most other software), the adjustment for depth of cut is automatically calculated from the declared origin and the stock thickness.

Hi I am no expert but as I know it in fusion 360:

it depends on your model origin and itâ€™s relation to the top, so if your origin is on the bottom and your stock is 20mm thick it will calculate the retract height to be 0 + 20mm + Retract height if this was 5mm then after correctly zeroing the machine it would retract to 5mm above stock, I was discussing this lastnight with Mikep and other in this post that you might find helpful (Setting Z to bottom of stock not to top )

Again this follows the same theory so if Z is 0 and the origin of the stock was at the top the CAM Function in Fusion 360 calculates that it needs to â€ś+â€ť to the height, if you set the origin to the top then it would minus the value. screenshots to make it clearer . So basically it is all interpreted from your initial sketch and placement of origin (not for this post but further into your workflow you can redefine your origin but that is a little bit more complicated):

Origin set at bottom the value would be plus

origin set at bottom the value would be minus.

Hope this helps
Sherpa
(more experienced people please correct me if I have anything wrong)

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I think @Sherpa might be over complicating things. There are a variety of ways of handling this, but Fusion makes it pretty clear with the options in the toolpath â€śHeightsâ€ť tab.

All of the settings give a â€śfromâ€ť option. Just decide what you want it you mean. Default is from stock top.

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Excelent information! I appreciate it wery much. The fusion 360 information will become handy when I start with my 3D ideas to!

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