Deburring Fibre/Resin Holes

Heat.

Or perhaps the new LynDoor™ EHAT process... sort of like this:

On the outside bottom of your regular drills, and on the outsides of your hole cutting drills, apply adhesive and emery or some other suitable abrasive.

My thinking is, that after your hole is cut, the final bit of drill would resemble a drum sander, and clean up the hole.

It might take some experimentation, but some variation of this might work.

You might even be able to machine a relief in the shank of the drill to accomodated a sanding drum of the right size.

_{(I like knurling, myself. No xtra abrasive particles to gum up the works)}

_{...knurling myself!}

_{It feels soo good when you stop.}

I could see grinding a shallow relief as well as a thin slot (probably have to wire edm that slot.) to slide the emery cloth through to essentially turn it into a flapwheel.you might need to wire edm some roll pin holes at 90 degrees to hold the emery paper in place.

That's a tall order. As long as you are dealing with fibers, it will be tough.

Can you knurl a 1/4 inch length of drill shaft, just after the flutes? The knurling may act as a grinder to clean out the fibers left after drilling. If it works, one pass and you're done.

Good luck.

Good idea, I will make a sample and try this next time I run the job.

They make spring loaded Titanium Nitride coated deburring tools that can debur both the front and back sides of holes in one pass from the front side. but I'm not sure how they'd work for Phenolic/fiberglass/etc.

here is one manufacturer:

http://www.ezburr.com/index.php

they make a burr free drill with both a drill and a deburring tool in one.

Where in the hole are the loose fibers?

The inner part can possibly be address with a self chamfering drill bit.

Would also look at the cutting edge of the bit.

As you give no details of what the fiber is. Though 1" diameter is quite large have you tried circuit board drills or looked at the cutting edge on such a bit?

Hi Jim

Could you apply a thin layer (3-5mm) of a semi-hard setting compound and drill through both and then remove the compound and all fibers at the same time? You would have no burs in the first place and removing the patch could be done chemically or by just peeling it of.

I'm not inside the pipe more outside the box.

Hope you don't need a drawing

Good luck, Ky.

Diamond Diamond Diamond-- I have worked with carbon fiber and resin before. Try to find diamond coated bits. Carbide will hold up for a little bit time, but diamond coated bits are the best for cost vs length of use.