HELP - micron machining 1

[joeinsv]

anyone know how to measure and do micron / submicron machining.

If you know any shop, let me know. Our company works with a german company doing highly precision work. But our company need to develop US based supplier technical know how for our component supplier chain

Please help !!

we are dealing the tolerance .28mm +/- 0.02 mm

 

[unclesyd]

Can you give a little more details as there are people that do specialized work?

What type machining is required?

What materials?

What quanities?

 

[lumenharold]

joeinsv,

You should choose where to post this (Optical or Mechanical, not both) since multiple posts are frowned on here.

As IRStuff said in the Optical forum, you'll need to provide more detail as what is being machined. We have vendors that we use for precision glass, vendors for precision plastic, and vendors for precision metal. I'm sure you could find many sources in a quick search but if you want recommendations you'll need to provide more information.

Harold
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http://www.lumenflow.com

 

[ajack1]

Does a limit of +/- 0.02 really count as micron machining? I would have thought that was well within what could be produced by many conventional methods.

 

[IRstuff]

Didn't read your OP closely enough; +/- 20 um for a finish isn't good enough for anything but RF.

20 um is only about 0.001", which is standard machining tolerance for placement of features. Surface finish should be orders of magnitude tighter.

Are you sure you have your units correct?

TTFN

FAQ731-376

 

[joeinsv]

oops...we are sourcing hyperbola rod using invar (38% over steel). There is an ion ejection slot of .28mm (.011") width with +/-.02 mm, 20 micron (which is .0008") . The slot is being made via EDM. The slot size accuracy is less than .001" (NOT .001"). It can not have any radius at the corner etc. We want to hold accuracy to .0001"


We try 4 micron (that is .004 mm, .00015"), and the result is not as good as the German component. So, it will be roughly 2 micron (that is .002mm, .00008")

I thought it is crazy, but the company is manfuacturing ion mass spectrometry. Ion is much smaller than this size.

Please help. The boss struggles many years to develop US supplier. We want to buy more components from US supplier than foreign vendor.

The only way is to do optical inspection. if u have any recommendation for instrumentation measurement. Please advice.

FYI: 0.002 mm (2 micron) = 2000000 picometer
zinc ion is 134 picometer and
lead ion is 146 picometer

 

[joeinsv]

The challenge is applied the accuracy to both part (or feature) location and size. The EDM electrode is .007" width.
Electrode size / location placement fixture is already out of range for this application.

It looks like any optical component fabrication will have some technology transfer know how.

 

[CorBlimeyLimey]

How thick is the slit material.
How long is the slit?
Maybe investigate acid-etching.

http://www.thorlabs.com/Navigation.cfm?Guide_ID=78

 

[unclesyd]

I would give Owens and ARC a call to see if print is worth while.

http://www.owensind.com/index.html

http://www.arcnano.com/page.php?pgID=19#13

Are you talking a rectangular slit with square corners or slit with square edges?

There are a couple of people that make apertures that we have dealt with and I'm trying to find them.
Also I try Monday to see if our people would like to do a outside job as it's very slow internally.

 

[joeinsv]

I forgot to add the slot length is 28mm (1.10")
and slot deep is 1.00 mm (0.039")

Let me describe a little further
(1) The slit corner is important. The slit edge and the slit straightness from front to back is extremely important.

As the electrode burns the slit, it will create a funnel shape. The slit straightness along the 1.0 mm depth is extremely important. (and of course everything is in the micron range). We dont know how to minimize the funnel shape of the slit.

As the plunge electrode comes in contact with the invar, the center line of the slot to the metal center line is extremely important. We dont know how to hold the accuracy in the micron range.

Is there anyway to inspect the part easily or in process
process control?


The invar material with the slit will be glued to a piece of quartz. How can this gluing assembly process able to hold accuracy in micron range?

if the invar/quartz interface is skew in micron during the gluing process, the assembly will affect the system performace.


thank you

 

[GregLocock]

I suggest you post a proper engineering drawing with tolerances on rather than attempting to use a thousand words for each feature.

Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.