We received pictures of nonconforming part (attached - TSP Feb password).
Difficult to see, but seems there is no deformation problem.
NSK concludes the seals they have are not GS3 37BWD07B-RA1-ENC.
There is risk that mix of different parts happened.
We also received some answers (not all yet)
1. How did you measure the NG parts?
Did you seperate seal from encoder ring and measure individually or did you measure the assembled encoder
When we measured the parts they where kept assembled, it was a quick measurement to determine main diameters of the assembled parts.
2. How did you detect the fault?
Did you measure NG parts on microscope after it was rejected by machine or did you detect on machine therefore measuring on machine
Parts where measured on our CMM after they where rejected during our assembly process.
3. Inner diameter of the encoder is 52.5 and inner diameter of the seal itself is 52.8
Which diameter did you measure?
(If you measured seal diameter; the reading should be ok)
As mentioned above the parts where measured in assembled form so the inner diameter of the part relates to encoder bore, external diameter is seal OD.
4. There are two outer encoder diameters with the same nominal value 66.5
On rubber part of seal - 66.5 tolerance +40/ +0.25
On core metal - 66.5 tolerance +20 / +0.10
As above.
Can you inform us which diameter was measured and therefore concluded NG?
See below.
5. Did you notice any differences in design of NG parts compared with OK parts?
The design is very similar however parts measured approx 3mm different to standard production. The conclusion is that these are mixed parts and are not GS3 37BWD07B-RA1-ENC
We requested to dispatch NG samples to TSI.
From now on we will need to establish contingency plan and inform it to NSK.
Please let us know it as soon as possible, by Monday next week at the latest.
Best Regards,