Is there any good public standards/codes for how to clamp and hold a work piece inside of a horizontal mill for drilling/face milling/end milling/etc...?
In the sense where you say "Clamp it per XXX ASME YYY Section 1.123.456"? - No.
As mentioned above, that's whats taught as a machinist trade school, union hall - if required in your state, or as an apprentice. The machinist handbooks have diagrams and drawings showing "recommended practices" such as tightening the dogs and brackets close to the work, leveling braces, etc.
But "spec's" ? Clamp it so it:
doesn't move far enough to affect your dimension tolerances,
is safe,
doesn't hit the tooling or machine,
is safe,
is affordable,
is safe,
can be built with what is available on hand in the shop,
is safe,
fits the table or mill bedplate T-slots,
is safe,
etc.
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Buy a book on workshop technology. Using a horizontal mill one should always attempt to clamp locating pads to the bed of the machine if heavy machine operations are envisaged, these will stop any creep of the work piece as one puts on heavy cuts. Aids to clamping are cast iron boxes and angle plates. For cylindrical work one use 'V' blocks to centralise and locate. In some cases machinists have to make fabricated special holding devices for particular work.
Clamping complex work to the bed is always a specialised and skilled job and should never be attempted by odd jobbers when the work is 1. expensive and 2. very large or complex.
Fixture's for this type of application are best built by an experienced Tool Maker so i would suggest that if you are not sure about the clamping pressures needed and or location of clamps and such you should consult a experienced Tool Maker. or the other method of this is trial and error wich can be dangerous.
