[kumarentran]

There seems to be some problem in plastic parts as they seem to be not flat.
A disc shaped part(flange) fails runout test, where when spun the change in spinning surface is more than 130microns( specs within 120 microns)
is this due to warping?
how to over come, measurement techniques???

[eugenedakin]

Hello kumarentran,

Could you help me out with some parts of your question so that I can help you with the problem?

Were these parts 'meeting specifications' before, and are not 'meeting specs' now, or has this always been happening?  Has some part of the formulation changed?

Is the molding equipment getting old, wearing out?

What type of plastic are you using (HDPE, LDPE, etc)?

What is the distance (radius?) of the part which has the out-of-spec runout?

What are you using to measure the part (micrometer, etc)?

I will be able to try and help you out by letting me know more about the problem.

I look forward to helping you out,

Eugene

[Donaldson Tan]

so vague..