![\"Educational](\"https:\/\/mnwell.com\/wp-content\/uploads\/2026\/11\/machining-stock-datums.png\")
<\/figure>\nThe sketch is a concept. Stock gaps are exaggerated. It is not to scale, not a complete fixture layout, and not a production drawing or customer part. Do not take the enlarged gold stock areas as a real allowance.<\/p>\n
A finished-part drawing alone is not a die-casting RFQ.<\/p>\n
It leaves the supplier guessing where to add machining stock, and how much.<\/p>\n
This page is buyer education for sourcing and engineering teams preparing a die-casting RFQ that includes post-cast machining. It is not a stock table, not a fixture or production drawing, and not a company capability sheet.<\/p>\n
Show both states: an as-cast drawing plus a finished one, or one view with the cast outline and stock marked on each machined face.<\/p>\n
Before you pick the stock, name the first-cut as-cast locators. In the sketch, that’s the R pads and the S face. Stock only makes sense relative to those references. Agree the allowance face by face, not as one number for everything.<\/p>\n
Those locators are not the finished datums. Locate on R and S, machine A, then relocate on A to create B. Write that shift into the RFQ, and when later setups switch to the finished set.<\/p>\n
For bores and turned diameters, write “radial” or “on diameter.”<\/p>\n
Keep die-cast stock modest, but enough to clean up reliably. A deep cut can break through the dense outer skin and expose porosity on a sealing face. More stock is not automatically safer.<\/p>\n
The figure is a teaching aid for the points above.<\/p>\n The sketch is a concept. Stock gaps are exaggerated. It is not to scale, not a complete fixture layout, and not a production drawing or customer part. Do not take the enlarged gold stock areas as a real allowance.<\/p>\n<\/figure>\nNext step<\/h2>\n