Accurate Measurement Method for Flash and Mismatch @0.002"

C

ChasELMN

#1
I am trying to find an accurate, cost effective way to measure flash and mismatch in an o-ring groove on a plastic molded part to less than 0.002". 3-D laser profilometry looks promising but expensive. Any other options for demonstrated success?
 
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Jim Wynne

Staff member
Admin
#2
Re: Measurement method for flash and mismatch @0.002"

I am trying to find an accurate, cost effective way to measure flash and mismatch in an oring groove on a plastic molded part to less than 0.002". 3-D laser profilometry looks promising but expensive. Any other options for demonstrated success?
Welcome to the Cove. :bigwave:

More information on part geometry/size would be good.
 
C

ChasELMN

#3
Re: Measurement method for flash and mismatch @0.002"

The part has 2 o-ring grooves ~3.200" dia X 0.120 wide and 0.120 deep. They are formed by mechanical slides in a multicavity injection mold. The molding material is a glass-filled nylon.
 

Jim Wynne

Staff member
Admin
#4
Re: Measurement method for flash and mismatch @0.002"

The part has 2 o-ring grooves ~3.200" dia X 0.120 wide and 0.120 deep. They are formed by mechanical slides in a multicavity injection mold. The molding material is a glass-filled nylon.
ID, OD, or on the end of the part?
 

Jim Wynne

Staff member
Admin
#6
Re: Measurement method for flash and mismatch @0.002"

I am trying to find an accurate, cost effective way to measure flash and mismatch in an oring groove on a plastic molded part to less than 0.002". 3-D laser profilometry looks promising but expensive. Any other options for demonstrated success?
The part has 2 o-ring grooves ~3.200" dia X 0.120 wide and 0.120 deep. They are formed by mechanical slides in a multicavity injection mold. The molding material is a glass-filled nylon.
The o-rings snap over the OD
Just to get all of the information in one place :bigwave:

You might want to consider a toolmaker's microscope, which can be a very handy thing to have around; more so than you might imagine. There are different forms of microscopes with graduated reticles in the eyepiece that are relatively inexpensive, on up to much more costly 3-axis types.
 
C

ChasELMN

#7
Re: Measurement method for flash and mismatch @0.002"

My issue is trying to measure a "Z" dimension while viewing in X-Y. I agree that non-contact system is probably best. I've not used a toolmaker's microscope. Are you proposing looking at the flash from the side and not from above?
 

Jim Wynne

Staff member
Admin
#8
Re: Measurement method for flash and mismatch @0.002"

My issue is trying to measure a "Z" dimension while viewing in X-Y. I agree that non-contact system is probably best. I've not used a toolmaker's microscope. Are you proposing looking at the flash from the side and not from above?
Does the flash protrude from the bottom of the groove, or from the wall?
 
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