Deburing holes

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Deburing holes

This topic has 39 replies, 20 voices, and was last updated 14 November 2018 at 03:33 by Eddy Curr.

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18 October 2018 at 09:27 #16045
Vic
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@vic
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18 October 2018 at 09:27 #376441
Vic
Participant
@vic
I often seem to need to drill holes or drill and tap along a round bar or thick tube, what’s the best way of deburing the hole to get the best appearance? Using a standard countersink obviously removes more material on the “high” sides of the hole and sometimes wanders off for some reason leaving it looking even worse. Any suggestions? A countersink with a pilot would perhaps help get a neater result if such a thing existed. I’m using M6 most recently. TIA.
18 October 2018 at 09:33 #376444
Michael Gilligan
Participant
@michaelgilligan61133
Countersinks with pilots certainly exist … 'though the ones I have are smaller than M6

That would address one of your two stated problems; but the other is 'interesting'

MichaelG.
18 October 2018 at 09:46 #376449
Vic
Participant
@vic
Having though about this a bit more I think I’ll try using a centre drill at much lower speed and see how that works. I’ve got into the habit of using spotting drills to start the hole then using a standard drill but a centre drill may be better. Still interested in others thoughts though. The last job was on a quite sticky bronze type of material and didn’t go well.
18 October 2018 at 10:13 #376453
Chris Evans 6
Participant
@chrisevans6
Centre drills with a 118 degree profile are available and the shallower profile may help. Work with a three square (triangle) scraper by hand is slow but can give a good result.
18 October 2018 at 10:23 #376456
Tony Pratt 1
Participant
@tonypratt1
Spot drill, drill, countersink & tap. having an uneven chamfer was never a problem in my machining days. Better on a mill if you have one to keep location constant.

Tony
18 October 2018 at 10:58 #376459
Vic
Participant
@vic
Chris, I should have thought of that, I have a small three square scraper.
18 October 2018 at 11:33 #376461
Brian Sweeting 2
Participant
@briansweeting2
Use a round file across the hole.
18 October 2018 at 11:45 #376464
Neil Wyatt
Moderator
@neilwyatt
I use a deburring tool.

Helps to have the right tip for the material and to go gently.
18 October 2018 at 12:30 #376467
Ian S C
Participant
@iansc
If you do use a drill or counter sink, it's often best to just hold the drill in your hand and do it that way, just a turn or two is enough. Ian S C
18 October 2018 at 13:05 #376472
Alistair Robertson 1
Participant
@alistairrobertson1
Back in my machining days we used a 90 degree countersink in a cordless drill to beburr holes for tapping and appearance. Our inspector would not accept any unchamfered holes and woe betide any draughtsman or designer who produced any design without the sharp edge removed! He was not averse to telling the boss that it was not acceptable but he was such a sharp guy that his position was secure. He could spot when there was an error in any project and must have saved the company a fortune over the years.

Alistair.
18 October 2018 at 14:06 #376477
ega
Participant
@ega
I had occasion to cut the tip off a step drill and afterwards it occurred to me that, mounted in a suitable handle, it would make an effective countersink/deburring tool:

It works best, of course, when the preceding step is a good fit in the hole being deburred.

On the tricky question of deburring holes in tubes, I suppose a CNC machine could do the job; I just make do with a small half round scraper.
18 October 2018 at 15:07 #376482
MW
Participant
@mw27036
Posted by ega on 18/10/2018 14:06:29:

On the tricky question of deburring holes in tubes, I suppose a CNC machine could do the job; I just make do with a small half round scraper.

You can get tube/pipe deburring tools designed to be used with a power tool such as an electric drill. I used to use these prior to loading bar into a cnc lathe bar feeder.

They seemed to work quite well so long as you kept your arm steady whilst you did it.

Michael W
18 October 2018 at 16:01 #376485
Michael Gilligan
Participant
@michaelgilligan61133
Some interesting responses … most of which would suggest that I started with the wrong assumption: I had assumed [always dangerous] that Vic was drilling for M6 across the the diameter of bar of [say] 100mm or less diameter.

MichaelG.
18 October 2018 at 16:09 #376486
ega
Participant
@ega
Michael Gilligan:

I had made the same assumption. Deburring the end of a tube cut square is, of course, easy enough and there are specialised tools (eg for plumbers' copper pipe) for the job.

Axminster have a fancy deburring tool for their PGS system on their website.

Edited By ega on 18/10/2018 16:10:58
18 October 2018 at 16:17 #376488
Martin Connelly
Participant
@martinconnelly55370
The OP refers to holes with high sides and this does imply cross drilling rather than in a faced off end. Noga deburring tools work well for holes like this.

Martin C
18 October 2018 at 17:12 #376492
Vic
Participant
@vic
Posted by Martin Connelly on 18/10/2018 16:17:57:

The OP refers to holes with high sides and this does imply cross drilling rather than in a faced off end. Noga deburring tools work well for holes like this.

Martin C

Yes, you’re right Martin.
18 October 2018 at 20:08 #376517
Tim Chambers
Participant
@timchambers76147
When I was an apprentice at Westlands in the 70's (I did'nt finish the course so I'm not an engineer ) standard practice for deburring holes was a couple of quick twists with a larger drill bit hand held. On the lathe we used a triangular scraper made from a file. The scraper end was used for internal edges and the file part was for the outside.
18 October 2018 at 21:24 #376531
Michael Gilligan
Participant
@michaelgilligan61133
Posted by Vic on 18/10/2018 17:12:21:

Posted by Martin Connelly on 18/10/2018 16:17:57:

The OP refers to holes with high sides and this does imply cross drilling rather than in a faced off end. Noga deburring tools work well for holes like this.

Martin C

Yes, you’re right Martin.

.

So, having ascertained that my assumption was correct …

What diameter of bar [or tube] are you drilling, Vic ?

MichaelG.
18 October 2018 at 22:16 #376541
Sam Stones
Participant
@samstones42903
The three-cornered scraper in my original set of three M&W scrapers tended to be a bit clumsy for small holes.

My real standby, especially for deburring tiny holes, was to modify the tip of a three-cornered needle file; i.e grind off the teeth and bring each flat down to a shallow (pyramid) point. A breeze to sharpen too!

Unlike the results from a standard 60 degree centre drill however, deburring threaded holes this way can leave a less-than-true (none symmetrical) result.

Sam
19 October 2018 at 11:54 #376614
ega
Participant
@ega
The book advice for threaded holes is to countersink before threading; I admit I often forget and have to put up with the result.
4 November 2018 at 18:59 #379175
Nick Hulme
Participant
@nickhulme30114
Posted by ega on 18/10/2018 14:06:29:

I had occasion to cut the tip off a step drill and afterwards it occurred to me that, mounted in a suitable handle, it would make an effective countersink/deburring tool:

It works best, of course, when the preceding step is a good fit in the hole being deburred.

On the tricky question of deburring holes in tubes, I suppose a CNC machine could do the job; I just make do with a small half round scraper.

Thanks!

I'm stealing that idea!
4 November 2018 at 23:51 #379214
ega
Participant
@ega
Posted by Nick Hulme on 04/11/2018 18:59:34:

Posted by ega on 18/10/2018 14:06:29:

I had occasion to cut the tip off a step drill and afterwards it occurred to me that, mounted in a suitable handle, it would make an effective countersink/deburring tool:

…

It works best, of course, when the preceding step is a good fit in the hole being deburred.

On the tricky question of deburring holes in tubes, I suppose a CNC machine could do the job; I just make do with a small half round scraper.

Thanks!

I'm stealing that idea!

Feel free!

Mine uses a metric drill that rises by twos but a more versatile tool would be in steps of one millimetre. Again, if you didn't want to tie up the step drill permanently it could be held in a chuck handle.
5 November 2018 at 19:06 #379333
I.M. OUTAHERE
Participant
@i-m-outahere
The noga platinum set i have has tips for de- burring just about anything and does it with ease so i will stick to that .
5 November 2018 at 19:52 #379338
Michael Gilligan
Participant
@michaelgilligan61133
Posted by XD 351 on 05/11/2018 19:06:30:

The noga platinum set i have has tips for de- burring just about anything and does it with ease so i will stick to that .

.

Useful looking set … but how small a diameter hole can it deburr ?

It all looks a bit hefty to help much with Vic's original question.

MichaelG.

.

https://www.linear-tools.com/tools/platinum-box.html

Edited By Michael Gilligan on 05/11/2018 19:52:49
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