Inspecting a difficult part - Measuring the centre of a hole to the edge of a rod

P

pearsonow

#1
Hi all,
So we have now got a CNC machining capability in house :)applause:)

I need to measure the produced items while we set up the programming to ensure we are drilling things in the right place (i.e. offsets etc)....

The problem then - We drill a blind, none through hole into a round length of acrylic rod. the hole is either 1/2 or 1/3 the thickness of the rod, depending on product.

I need to measure, with very limited facilities and equipment the centre of the hole to the edge of the round bar we are drilling to ensure we are in the middle of the diameter - I would love to CMM measure it, but we don't have one. I have some digital calipers, some steel rules and a CNC Milling machine.

Any ideas....:confused::confused:
 
Elsmar Forum Sponsor
#3
Re: Inspecting a difficult part - need help!

Can't you find another shop, locally, which has a cmm? Otherwise, you're going to have a headache! Trying to find a pin which is the correct fit in a blind hole, to give an accurate location is going to take longer than finding a cmm...

(BTW - given the new cnc machine, is a cmm being planned?)
 
P

pearsonow

#4
Re: Inspecting a difficult part - need help!

Hi Steve,

yes and no!

As the 'setters' we would want a bit more than a pass fail - we need to adjust the machine for any error in jig alignment, but for the operator a simple pass fail would be fine.

While the hole itself is fairly easy to measure in terms of diameter and depth etc, it is the location of the hole with respect to the rod outer diameter/centre line we need to measure. We are looking at a way of doing it, but a custom jig looks like the way forward....
 
P

pearsonow

#5
Re: Inspecting a difficult part - need help!

Hi Andy,

That would be a good solution, and I am looking into it, I am concerned about the time lag though - if it takes me 20 mins to get there and measure we could have produced nearly 100 faulty parts!

I think the custom jig option is looking like the way forward. I will post a couple of sketches once I have them done to show what we are thinking.

Olly
 

Jim Wynne

Staff member
Admin
#6
Re: Inspecting a difficult part - need help!

Hi Steve,

yes and no!

As the 'setters' we would want a bit more than a pass fail - we need to adjust the machine for any error in jig alignment, but for the operator a simple pass fail would be fine.

While the hole itself is fairly easy to measure in terms of diameter and depth etc, it is the location of the hole with respect to the rod outer diameter/centre line we need to measure. We are looking at a way of doing it, but a custom jig looks like the way forward....
No optical comparator? Absent a CMM, it seems like mounting the rod in a V-block and putting a pin in the hole and measuring with a comparator would probably be the best way.
 
P

pearsonow

#7
Re: Inspecting a difficult part - need help!

I wish!

Literally all we have is some digital calipers (150mm and 600mm) and some rules, while the calibration piece is much simpler to track than previous jobs, it makes this sort of thing more difficult.

We are looking at a custom fixing jig and height gauge....
 

Michael_M

Trusted Information Resource
#8
Re: Inspecting a difficult part - need help!

Given you have a new CNC (Mill I assume), can you get a probe measurement system and add it to your program to check the part as the part is running. Also, a probe measurement can auto-correct location so it measures the part, sets it's 'X', 'Y', and/or 'Z', then drills the hole or what ever else the machine is doing.

The problem you will have with this 'fix' is any measurement you may need in the future is limited to the CNC only.
 
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