Metrology

[Rokap]

Hi All,
In metrology, we are working on small plastic parts, and sometimes it needs cutting to reach the wanted dimension, right now we are using a cutting disc, it's dangerous and it may deform the parts, is there any advanced tools, that can guaranty the security, and preserve parts from deformation.
Thank you for your help.

 

[IRstuff]

How often is "sometimes?" I have issue with metrology doing rework for production, in addition to the simple fact that yield should be designed-in, not reworked in. If the manufacturing tolerances are bad, the design should accommodate that, or find new manufacturing process.

TTFN (ta ta for now)
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[GregLocock]

The dimension is there for a functional reason (I hope) therefore create a rig that measures that function rather than trying to measure something directly.

For example suppose you had an oil lubrication channel in a casting. You could cut castings open and measure the dimension of the channel. or you could put a certain flow rate of fluid through it and measure the pressure loss.

Cheers

Greg Locock


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[MikeHalloran]

I have on occasion had to cut open (and destroy) assemblies in order to verify what was potted in, or even just to verify a dimension that no gage could reach.

I found that an ordinary hand hacksaw, fitted with a Grit-Edge blade, can do a nice job of basically making a metallurgical section. Fine grit round section blades can even section a potted optical assembly right through the lens.



Mike Halloran
Corinth, NY, USA