Expert Machinist > To Modify Stock Offsets
To Modify Stock Offsets
Stock offsets are added along the Stock Origin coordinate system axes. For Length, Width, and Height, typing a value in the plus (+) textbox specifies the stock allowance on the positive side of the corresponding axis, while typing a value in the minus (-) textbox specifies the stock allowance on the negative side of the same axis. There is only one textbox for Diameter stock allowance (for a Default Bar stock).
1. Click the Options slide-up panel in the automatic stock creation dashboard area. .
The Options area of the dialog box expands. It contains the following fields:
Units—Select the unit type for the dimensions and offsets.
Overall Dimensions—Define the overall dimensions of the stock in the x, y, and z direction.
Current Offsets—Show the current stock allowance values. For Custom stocks, you can redistribute the current extra material among the stock faces, that is, shift the stock with respect to the reference model. For Envelope stocks, the current stock allowances are listed for information purposes only; you cannot change them. For Default Bar stocks, the Diameter stock allowance is also listed for information purposes only.
Minimum Offsets—Define the base values for the current offset.
Rotation Offsets
Allowance Rules—Define the minimum stock allowances with respect to the reference part envelope. This option is primarily used with Envelope stocks.
2. For Envelope stocks, select Allowance Rules and type the desired stock allowance values in the plus (+) and minus (-) textboxes for Length, Width, and Thickness, and in the Diametertextbox.
As you change a value, the system adds the stock allowance along the appropriate axis of the Stock Origin coordinate system (x-axis for Length, y-axis for Width, and z-axis for Thickness) and updates the stock display.
3. For Custom stocks, you can also specify Allowance Rules, if desired. This does not directly affect the stock size. However, if you define Allowance Rules for a Custom stock and later modify the Stock Size, the system will not let you decrease the stock dimensions to violate these rules. For example, if your reference model length is 10.000 inches, and you specified both a plus (+) and minus (-) stock allowance for Length as 0.500, the system will not let you decrease the Length value in the Stock Size area of the dialog box to less than 11.000 inches.
4. For Custom stocks, you can change current stock allowances to shift the stock with respect to the reference model. To do this, select Current Allowance and type the desired value in one of the textboxes, for example, in the plus (+) textbox for Length.
The system updates the value in the second textbox and shifts the stock (in this example, along the x-axis of the Stock Origin coordinate system).
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