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Performing MSA on Straightness of a Cylinder

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#1
Hello,

I appreciate some supports here concerning making a MSA on straightness on a cylinder. In our production we measure straigtness on outer lateral surface and for each cylinder we only make one measuring. We use a CMM and a v-block as a fixture for the cylinder.

What is the best procedure when it becomes to make this MSA, should we mark on the cylinder where on the outer lateral surface the operator should measure the straightness or should we not mark the cylinder at all?
 
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#2
Re: Straightness on cylinder -MSA

Normally to measure the straightness of a cylinder on a CMM take a number of circles at different depths around the pin (or bore) then verify the straightness of the center points.
 

Stijloor

Staff member
Super Moderator
#3
Re: Straightness on cylinder -MSA

Within the context of a cylinder, ASME Y14.5 makes a distinction between:
  • Straightness of line elements
  • Straightness of an axis (at RFS-MMC-LMC)
 
T

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#4
Re: Straightness on cylinder -MSA

Within the context of a cylinder, ASME Y14.5 makes a distinction between:
  • Straightness of line elements
  • Straightness of an axis (at RFS-MMC-LMC)
I have never seen that first option used in practice. If that was the case, you would need to check the straightness at multiple/each rotation.
 

Stijloor

Staff member
Super Moderator
#5
Re: Straightness on cylinder -MSA

I have never seen that first option used in practice. If that was the case, you would need to check the straightness at multiple/each rotation.
The OP mentioned "straightness on a cylinder", hence my comment.

I'll ask the OP to attach a drawing/sketch...
 

Stijloor

Staff member
Super Moderator
#6
Re: Question on performing MSA on Straightness of a cylinder

Hello,

I appreciate some supports here concerning making a MSA on straightness on a cylinder. In our production we measure straightness on outer lateral surface and for each cylinder we only make one measuring. We use a CMM and a v-block as a fixture for the cylinder.

What is the best procedure when it becomes to make this MSA, should we mark on the cylinder where on the outer lateral surface the operator should measure the straightness or should we not mark the cylinder at all?
It would help our CMM and MSA experts here if you could attach a drawing/sketch to avoid confusion.
 

Golfman25

Trusted Information Resource
#8
Hello,

I appreciate some supports here concerning making a MSA on straightness on a cylinder. In our production we measure straigtness on outer lateral surface and for each cylinder we only make one measuring. We use a CMM and a v-block as a fixture for the cylinder.

What is the best procedure when it becomes to make this MSA, should we mark on the cylinder where on the outer lateral surface the operator should measure the straightness or should we not mark the cylinder at all?
Try it both ways. If you can get good results without marking the cylinder go with that. If you can't, then mark the cylinder. In my experience we have to mark our parts because of too much part variation.
 
B

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#9
We have now made the MSA and we marked the cylinder where the operator should measure the parts. I will check the result tomorrow.
 
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