Dial Bore Gage Contact Points leaving witness/burnish marks

C

cpbraun

#1
Does any one have experience using alternative materials for dial bore gage contact points? The regular ones are leaving witness/burnish marks in our bores that require Ra8 or better finishes.
Any shared experiences/direction would be welcomed!:thanks:
 
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ISOsandy

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#2
Re: Dial Bore Gages

:) is this Chris that used to work at Goodrich?

As far as the dial bore, we had to go to a large radius tip which helped, but then we have to continue to polish the tip to keep it from scratching the parts.
 
S

Sturmkind

#3
Ceramic dial bore tips may help depending on the material you are measuring.

A better choice may be to consider an ID air gage probe formerly made by Federal Products and now owned by Marposs/Mahr.

Good luck!
 
C

cpbraun

#4
Re: Dial Bore Gages

Hey! Yes it is! Left GR about 6 months ago.... We are looking at several options including air gaging, ceramic or nylon contact points etc.
 

bobdoering

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#6
If you are looking for precision measurements, I would write off nylon tips. Air gaging is likely your best bet. You can also look at Western Gage air gages. They are also better at picking up out of round, and don't have the gage error that dial bore gages of being cocked off axis.

The closer to non-contact your method is, the less of a problem you will have.
 
K

kgriff

#7
I agree that air gaging may be your best bet. We use extensive air gaging at the facility where I work. We have found it to be an excellent solution for many ID measurements, as well as OD, where necessary. The newer Marposs air gage setup is pretty nice.
 
S

sarasheed

#8
I suggest you to use 3-Point Internal Micrometers supplied by M/s.TESA.This instruments are easy to operate and will not damage the surface finish of the part.
 
5

56flh

#9
I suggest you to use 3-Point Internal Micrometers supplied by M/s.TESA.This instruments are easy to operate and will not damage the surface finish of the part.
At one time we used a trimic to check bores but found that they will not pick up an out of round condition too easily, a two point bore gage does a much better job of this.
 

bobdoering

Stop X-bar/R Madness!!
Trusted Information Resource
#10
At one time we used a trimic to check bores but found that they will not pick up an out of round condition too easily, a two point bore gage does a much better job of this.
The key to that issue is whether you have tri-lobal or bi-lobal variation in your roundness.
 
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