Projected tolerance zone
Projected tolerance zone
(OP)
Who can give me information on when to use a PTZ and not
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
Projected tolerance zone
|
RE: Projected tolerance zone
Chris
SolidWorks 06 5.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 01-18-07)
RE: Projected tolerance zone
RE: Projected tolerance zone
If you got 2 threaded hlooles that line up it sounds like you got big time problems. Can you give an ilustration of what you have.
RE: Projected tolerance zone
The example that is comming to mind is a hole into which a long rod or bolt will be inserted and needs to intersect with a feature on another part.
As far as a certain height requirement, no. Height has nothing to do with it. It has everything to do with whether the angle of the hole is critical.
David
RE: Projected tolerance zone
Chris
SolidWorks 06 5.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 01-18-07)
RE: Projected tolerance zone
It should not be globally applied to all tolerances as this can cause tolerances to fail that in reality will pass and assemble correctly.
RE: Projected tolerance zone
The positional tolerance on the threaded holes could only be confirmed as far as location but perpendicularity could not be confirmed.
Now, if we use a projected tolerance zone on the threaded holes at just a bit over .75 inch thickness, we now can check the perpendicularity of the holes.
The CMM Operator would have to assemble threaded studs into the threaded holes so that the top of the studs would be a bit over the .75 inches.
One would check the positional tolerances on the surface and then again at the top of the studs. In both cases, the positional tolerances must meet the requirement.
A checking fixture could also be developed if the positional tolerances were in a MMC mode.
Dave D.
www.qmsi.ca
RE: Projected tolerance zone
I believe the answer to your question is that you would use a PLTZ when the relationship to the datum frame is not as critical as the relationship of the hole to hole relationship within that pattern.