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591 views
00:45 Apr-03-2000

Phil Herman Jr.

Sales, - Manufacture of NDT Reference Standards/Test Blocks
PH Tool Reference Standards,
USA,
Joined Oct 1999
79
Epoxy-filled EDM Notches for MT

PH Tool manufactures NDT Reference Standards and Test Blocks. We have a need for epoxy-filling of narrow (0.001" to 0.005" wide) EDM notches in Mag Particle standards in order to prevent mechanical holding of the indicating medium. We are searching for an epoxy that does NOT naturally flouresce under a blacklight. Does anyone have a suggestion for such an epoxy?



 
08:28 Apr-05-2000

Dent McIntyre

Consultant, NDE Manager NDELevel III/3
NDT Consultant,
Canada,
Joined Nov 1998
244
Re: Epoxy-filled EDM Notches for MT : PH Tool manufactures NDT Reference Standards and Test Blocks. We have a need for epoxy-filling of narrow (0.001" to 0.005" wide) EDM notches in Mag Particle standards in order to prevent mechanical holding of the indicating medium. We are searching for an epoxy that does NOT naturally flouresce under a blacklight. Does anyone have a suggestion for such an epoxy?

Why are you stuck on Epoxy? Why not fill it with solder or brazing rod?


 
02:11 Apr-05-2000

Phil Herman Jr.

Sales, - Manufacture of NDT Reference Standards/Test Blocks
PH Tool Reference Standards,
USA,
Joined Oct 1999
79
Re: Epoxy-filled EDM Notches for MT : : PH Tool manufactures NDT Reference Standards and Test Blocks. We have a need for epoxy-filling of narrow (0.001" to 0.005" wide) EDM notches in Mag Particle standards in order to prevent mechanical holding of the indicating medium. We are searching for an epoxy that does NOT naturally flouresce under a blacklight. Does anyone have a suggestion for such an epoxy?

: Why are you stuck on Epoxy? Why not fill it with solder or brazing rod?

Dent,

Good question. The original guidance comes from MIL-STD-271 which calls for filling the notch flush with a nonconducting material such as epoxy. However, a 60%Lead /40% Tin solder (or possibly a higher Tin content) may be a good choice. We'll give it try. It will be more difficult to apply than epoxy, and will likely require a final operation to sand or blend flush, but if it works then it's worth the effort.

Thanks,
Phil Herman Jr.


 


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