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I need to verify the surface profile of a part - Sine plates

C

Coleman Donnelly

#1
I need to verify the surface profile of a part using a surface plate and height gage. My feature is not perpendicular or parallel to my datum - therefore I will need to use a sin plate to orient the feature parallel to my surface plate.

How do I calculate the gage block stack up for my sine plate, and how do i Zero my height gage if my datum plane is no longer parallel to my surface plate?

Thanks
 
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Michael_M

Trusted Information Resource
#2
Re: Sine plates...

If I understand the question correctly. The stack height is: Sine plate distance * sin of angle desired.

For example if using a 5" sine plate and want a 15 degree angle, the stack will be 1.2941 (1.294095 rounded).
 

Stijloor

Staff member
Super Moderator
#4
I need to verify the surface profile of a part using a surface plate and height gage. My feature is not perpendicular or parallel to my datum - therefore I will need to use a sin plate to orient the feature parallel to my surface plate.

How do I calculate the gage block stack up for my sine plate, and how do i Zero my height gage if my datum plane is no longer parallel to my surface plate?

Thanks
OK, now you have the initial setup out of the way, can you describe the "Profile of a Surface" callout? I may be able to help you with its interpretation, better still, can you attach a sketch?

Stijloor.
 
C

Coleman Donnelly

#5
HTML:
Think of the shape of an 'A' with the top triangle section removed:
          
           Basic
          <--->   
           ____
          /      \
         /        \
        /          \
DatumA          Profile0.010|A

The left leg is datum A.  The right Side is my profile call out.  I have a basic distance to the nominal surface location.

If the legs were parallel I would zero out my height gage on the datum surface.  Raise the height gage the baisic distance.  Re-Zero the height gage, and measure deviation from zero on the surface.
The problem is how do I zero out my height gage if my datum surface is not parallel to the base of my height stand. depending on where I zero I get a different result.
 
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