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Join Date: Apr 2016
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Depth of Micro Holes

04/14/2016 2:17 PM

does anyone know of a better method to measure a .025" dia hole depth that is 2.025"+other then using a 3" gage pin and calipers. I have about 700 of these. I need something quick and accurate.

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#1

Re: depth of micro holes

04/14/2016 2:35 PM

How were they drilled? Flat bottomed or drill angle?How was any residue removed to leave a clean hole? Is the material magnetic?
What is the tolerance?Is the tolerance symmetrical?(by that must the hole be a minimum depth, but might be larger?
One thinks of a test pin made of a hardened magnetic material(for manipulation), of the exact length. material that is placed in the hole.It is then inspected, one at a time, to see if sticks above the plane or is below it?

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#5
In reply to #1

Re: depth of micro holes

04/14/2016 3:30 PM

edm / not blind and need variable data not go/ no go

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#6
In reply to #5

Re: depth of micro holes

04/14/2016 4:15 PM

Huh? If not blind, they go all the way through, and you can just measure the material thickness.

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#2

Re: depth of micro holes

04/14/2016 2:57 PM

laser

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#3

Re: depth of micro holes

04/14/2016 2:57 PM

Modify the probe on something like this:

Digital tires thread depth gauge gage Thin Rod pit gauge

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Participant

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#12
In reply to #3

Re: depth of micro holes

04/15/2016 6:44 AM

would be great if I could find one with a .025" pin

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#16
In reply to #12

Re: depth of micro holes

04/15/2016 10:29 AM

Make your own pin.

There are lots of digital verniers around you can select from. The pin does not need to be precision in length since you can zero on a datum surface.

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#18
In reply to #16

Re: depth of micro holes

04/15/2016 11:12 AM

but it will be delicate, micro drills are only a fraction in length

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#19
In reply to #18

Re: depth of micro holes

04/15/2016 3:11 PM

Use piano wire - dirt cheap.

www.grainger.com/product/GRAINGER-APPROVED-Music-Wire-15V226

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#4

Re: Depth of Micro Holes

04/14/2016 3:25 PM

Since no one else has asked, What is a .025" X 2.025" deep blind hole used for?

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#7

Re: Depth of Micro Holes

04/14/2016 4:35 PM

<Beam me up Scottie>

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#8

Re: Depth of Micro Holes

04/14/2016 4:35 PM

I assume by 2.025"+ you mean it can be greater than 2.025" but must be at least that deep. Can you mark the pin gauge at 2.025" so that you just have to bottom it in the hole and visually verify it goes in that deep?

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#9

Re: Depth of Micro Holes

04/14/2016 4:49 PM

You need a precision depth gauge....or you could put it back on the EDM machine which should have a depth readout...

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#10
In reply to #9

Re: Depth of Micro Holes

04/14/2016 5:01 PM

mitutoyo makes these

but you might need a custom probe to fit on it that can be inserted in that hole

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#14
In reply to #10

Re: Depth of Micro Holes

04/15/2016 8:24 AM

have a couple of those just don't know where I can get a custom made calibrated to NIST pin or 10 since3 most likely they will get broke

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#11

Re: Depth of Micro Holes

04/15/2016 4:37 AM

If your pin is an accurate 3" just drop it in the hole & use a digital caliper on the projecting part. Hard to see how you would get much quicker than that.

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#13

Re: Depth of Micro Holes

04/15/2016 6:50 AM

If they have been made on CNC/EDM etc, then the hole matrix will be well understood and already programmed and fixtures must already exist.

Mount the pin into the chuck/head and have the machine "zero" to the datum surface and then check the holes in the matrix.

Alternatively, use a CMM with a bar/pin probe to get the depth.

All depends on your necessary tollerance.

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#15

Re: Depth of Micro Holes

04/15/2016 9:13 AM

Depth of micro hole, is it not in the range of micrometer? It's odd when it's in nano or milli range.

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#17

Re: Depth of Micro Holes

04/15/2016 11:08 AM

Might try Laaper Industrial...they make depth gages with pin diameters down to .008".

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#20

Re: Depth of Micro Holes

04/15/2016 3:42 PM

If you have a depth gauge with too large a probe, you could drill out the end with a #76 (0.0200) drill and insert a 24-gauge wire (0.0201), which is a slight interference fit.

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#21

Re: Depth of Micro Holes

04/16/2016 2:44 AM

Acquire a standard digital depth gauge (gage for some of you), modify the pin so that it enters the hole fairly easily, attach an extension spring to the top part (the bit that is opposite the pin and to the back of the gauge so that the pin is pushed all of the way down when the spring retracts.

Zero the reading with the gauge pressed down against a solid object and the end of the pin level with the base of the gauge, it will now read maximum when you lift it up.

Now simply insert the pin into the hole push the base of the gauge down against the face of the item and the correct depth will be shown on the readout.

Withdraw the gauge, the pin will reset automatically, and you can proceed to the next hole.

A half mm pin is going to be pretty fragile, so you may be wise to get one with a replaceable pin.

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#22

Re: Depth of Micro Holes

04/18/2016 5:55 AM

X-ray the thing with a reticle in the shot for scale and measure from the print.

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#23

Re: Depth of Micro Holes

04/19/2016 12:26 AM

Dimensional air gaging

http://www.mmsonline.com/columns/air-gaging-for-itty-bitty-holes

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