Never did get a definite answer on this one... Any further thoughts or comments?
All I am really after is the tolerancing required for the first step in the deep boring operation, which is to drill the hole straight though the bar. All the finishing is handled by another drawing. I just want...
The OD of the stock material is 3.5"
The ID of the bore (though entire length) is 2.125"
Depth of bore (thru' all) is 12 feet.
Hole will be bored, stock OD will be turned down to finished diameter 2.875".
As there is sufficient stock OD to work with, it should be relatively straight forward to...
Yes, it is a metal part. The bore is through the entire part. About 12 feet long total.
As the OD of the initial stock bar will be turned to a finished diameter, I have usually specified a drift of 0.001" per 1.0" depth. As the OD is sufficiently oversized, the total 'wander' of say 0.144"...
Question regarding GD&T for deep drilling / boring drawing. What is the common practice for tying down an internal bore, taking into account straightness, cylindricity, and 'wander' from start to finish of the bore?
00viggen
