Checking holes perpendicularity

[shingouz]

Hello,
I want to know if the axis of a drilled hole is perpendicular to the plate edge. What are 'indstrial tools" that exists to perform this measurment?
Thanks

 

[MikeHalloran]

The tools that would be appropriate depend on the tolerance, so far not revealed.



Mike Halloran
Pembroke Pines, FL, USA

 

[bigTomHanks]

Stick correct dia. shaft (drill bit) in hole and use gauge block to look for gaps around shaft and surface.

 

[DanStro]

If you have access to a CMM you could get very accurate measurements.

Han primo incensus

 

[ornerynorsk]

Never use a drill bit for a pin gage, use a pin gage and an accurate square.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

 

[WKTaylor]

ornerynorsk...

I fully understand WHY You said "Never use a drill bit for a pin gage, use a pin gage and an accurate square"...

However If You could explain this to "all others" it would be helpful (I haven't got the time).



Regards, Wil Taylor

Trust - But Verify!

We believe to be true what we prefer to be true.

For those who believe, no proof is required; for those who cannot believe, no proof is possible.

 

[ornerynorsk]

Thanks for that Wil. A drill bit should not be used as a pin gage because it is not a pin gage, it is a drill bit.

Also, because you do not have continuous periphery on the lands and margins of a drill bit with which to fully contact the sidewalls of the hole being checked. Threaded rods, pencils, bolts, cigarettes, and that left-over dried-up french fry you found under the bench are also verboten.

Point being, use the correct tool for the job.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

 

[WKTaylor]

Shinouz... also...

CAUTION. Inserting the razor-sharp-flutes of a drill/reamer-bit into a hole is guaranteed to produce length-wise bore scratches, which can grossly shorten fatigue-crack initiation time and reduce the overall fatigue-life of the assembly.

NOTE. Inserting the shaft-end [smooth-end] of the drill/reamer-bit into the hole may work "OK", assuming that the shaft is burr-free. HOWEVER, IF the shaft is burred [IE: due to drill-chuck scoring], then the burrs will also score the hole walls, same as the drill-bit flutes.

Best plan is to use go/no-go hole pin-gages with a perpendicularity check-block.

Regards, Wil Taylor

Trust - But Verify!

We believe to be true what we prefer to be true.

For those who believe, no proof is required; for those who cannot believe, no proof is possible.

 

[berkshire]

If you do not have a pin gauge, a brand new drill inserted shaft end first, will get you by . But it is prefferable to get the proper pin gauge.
B.E.

 

[Higgler]

My company did a recent project for a large aircraft manufacturer to measure holes in sheetmetal using photographic techniques. It was to measure the hole location relative to an edge. I've spoken to our workers about measuring dings/dents and we came up with a plan using dual digital cameras rolling across a surface with laser graticules to measure the dings (lasers reshape image projection in a dented surface).
Most machine shops use photographic imaging for best dimensional measurement accuracy.
?I'd guess image analysis might answer your question. Would take some effort tho.