Scan Burrs Existence Inside Dia Of Pipe

you have given me a good idea... tough about it for a little thing in hand´s! if there is none such scanner, (that I don't believe), you can make one! laser is a option, and exist for decades in super market´s! you know, the bar code reader!

how about a borescope.

you can pick one up pretty reasonable, Globalsec, ebay to name a few.....

Drill the holes backwards, so the burrs are on the outside of the pipe.

Oooh, I like it!

I was going to suggest old school: ball of something fluffy (loose cotton, fiberglass maybe) pushed through the pipe. Burrs would certainly grab little tufts, revealing their presence.

In a production scenario, this may prove too clumsy.

How do you turn the pipe inside out to accomplish this?

How long is the pipe?

You can't remove burrs with a grinder in that manner, you'll get the bulk of the material but as there is already excess the holes will still have sharp corners that will instantly reform into burrs in a short period of time, like in the drill holes this time though.

I would recommend after grinding (to remove the bulk of material) to spin the pipe through an external shot blaster to make sure the through holes are clear of materials, the shot blast bouncing through the inside of the pipe will smooth the inner edges as well.

You could also after grinding electro chemical etch the tubes is a good solution to burrs, as long as they're truly burrs (thin) but that kind of processing can get quiet expensive.

Fully defining the nature of the part you're making and the nature of the burr itself might help.

We've beat this horse till it's bloody.

Torque Needed to Drive a Grinding Stone

X-ray the thing.

I think bloody horse is the primary ingredient in most of the CR4 cafeteria menu items isn't it?

It seems to be a favorite item here anyway!

While you are looking for the tool you need to find the burrs, how about getting a few hand de-burring tools and put someone to work. These folks have a blade for most any type of hole or material.

http://www.shavivusa.com/

There are reverse deburring tools available that will deburr the backside of drilled holes.

Here is one type: http://www.mcmaster.com/#bur-tools/=io22qd

There are others where the blade retracts when passing thourgh the hole and then expands while you pull it back against the backside of the hole.

Machine tool supply houses have these.

we are building a new PLC controlled machine with drill cum deburr tool (E-Z burr brand burrfree), but will take more than a year, its a big machine. but i am searching for the scanning device for some other our purpose.

i am not looking for tools or process how to deburr, now i am looking only to scan the pipe from outside and find the burrs exits inside.

If this is an ongoing operation you can set the drill bits so they don't leave a burr, you don't say what size pipe or dia of hole.

Bazzer

oh sorry, pipe dia from 3 to 7 inch, wallthick 8-14mm length of pipe 12m.

Start with a sample that is known to be burr free.

Shine a light down one end and measure the light intensity at the other end. This is your burr free reference.

Now, take the sample to be tested and repeat the operation. If the light intensity is lower then there is a burr inside the pipe. ( If it is higher then your reference has a burr....)

actually its our traditional method we are following. but my boss asks a laser or x-ray kind of device that can scan from outside.... i dont know....

Two options. The first is simpler and will tell you if there are any burrs. The second will tell you where the burrs are. Note this will only work if you have very straight pipes with a good quality internal wall surface.

Option 1. Variation of the shadow-graph technique.

Fit the pipe into a jig with a laser at one end and a ccd array/detector at the other end. Align the laser so that 50% of the beam is reflected by the circumference of the pipe and 50% shines directly down the pipe onto the detector. Drive the laser and the detector in a circle around the circumference. If there are no burrs, the light falling on the detector will remain constant. As the beam passes over a burr some of the light will be blocked and the presence of the burr registered. (Now you know why the pipe has to be straight)

Option 2. Detecting light scattering.

This time the detector is mounted on the centre axis of the pipe. The laser is aligned at a shallow angle so that it hits the inside wall of the pipe. Now drive the laser form the circumference to the centre axis. As you do this the beam will reflect off the inside progressively further down the pipe scanning a complete row of holes. Rotate the laser around the pipe axis and repeat for subsequent rows of holes. As the beam passes over the internal wall some light will be reflected onto the detector. As the light passes over an unburred hole a different (but relatively consistent) amount of light will be reflected onto the detector. As the beam passes over a burred hole the amount of light reflected will be random. There should be enough difference to register which holes are burred.

Only you will know how consistent the inside of your pipe is which will determine if this will work. I do not think that this equipment exists, so you would need to start from scratch. The engineering department of your local university would probably take this on as a post graduate research project but that will take a long time. Keyence do specials and might be interested in developing it for you in a much shorter time scale, but make sure that you are sitting down when they give you the price.

Thank you very much jhhassociates,, i already approached keyence for scan from outside, but they dont have any, because my boss wants a outside scanner...i dont think it exits in the world.

Outside scanner....

Find a potato that fits snugly inside the tube.

Push the potato all the way through the tube.

Inspect the potato.

If the outside of the potato is grated then you have burrs inside your pipe.

ok will do, u pls help me to buy potatoes....

That's women's work.

I dont believe I have seen what this pipe is made of... Galvanized steel? PVC? copper?

Something I am wondering is if one might use ultrasound to look for burrs. I am NOT familiar with ultrasound in industrial applications. I just know that my wife finds interesting things in people using it. Something I find interesting is that the ULTRAsound they use is around 4 MHz.

Bill

its a low corbon steel.