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Seized set screw removal #4585603
11/26/17 02:17 PM
11/26/17 02:17 PM
Joined: Dec 2002
Posts: 42,846
New Jersey
JHZR2 Offline OP
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JHZR2  Offline OP
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New Jersey
On 1920s-ish hardware on a same age door.

Knobs were loose, but set screw was stuck. Someone long ago already stripped the screw thread, so Ive tried to remove it.

Kroil, ATF, etc don't help. I assume there's a combo of human oils, chemical bonding, etc.

Going to break the extractor if I try any harder.

So what's next??



Re: Siezed set screw removal [Re: JHZR2] #4585608
11/26/17 02:21 PM
11/26/17 02:21 PM
Joined: Sep 2005
Posts: 6,346
MIchigan
Warstud Offline
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MIchigan
Drill it out.

Re: Siezed set screw removal [Re: JHZR2] #4585626
11/26/17 02:38 PM
11/26/17 02:38 PM
Joined: Dec 2002
Posts: 42,846
New Jersey
JHZR2 Offline OP
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Pardon my ignorance, isn't that what I did?

I used a #2 extractor with a hole pre drilled. Used a slightly undersized hole so the extractor had more bite and less chance to bottom out.

A shallow extractor bites but distorts the brass around the screw vs removing it. Ask how I know frown

New set screw will be 1/4-20, are you implying to just drill and tap as is?

Re: Siezed set screw removal [Re: Warstud] #4585633
11/26/17 02:46 PM
11/26/17 02:46 PM
Joined: Jul 2016
Posts: 1,893
Jacksonville, FL
FlyNavyP3 Online content
FlyNavyP3  Online Content

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Posts: 1,893
Jacksonville, FL
Originally Posted By: Warstud
Drill it out.


I agree.

To answer your follow on question I think what Warstud was saying and what I'm suggesting is to drill the set screw in your drill press as you end already done for the tap drill size for the size of the set screw, then tap and use a new set screw. No need to go over size from original, just make new threads.


Luke
P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander
Re: Siezed set screw removal [Re: JHZR2] #4585640
11/26/17 02:50 PM
11/26/17 02:50 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
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Clovis, CA
That's the wrong kind of extractor. What those kind do is exert outward force on the fastener as you turn it to the left. Counterproductive is the word I use to describe those kind of extractors.

Re: Siezed set screw removal [Re: JHZR2] #4585643
11/26/17 02:52 PM
11/26/17 02:52 PM
Joined: Sep 2004
Posts: 8,176
Marshfield , MA
andyd Offline
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Marshfield , MA
Back that extractor out before it snaps. Continue to drill going up in size gradually until there is no screw left. Then tap, I would use the smallest over size possible. a 10-32, 12-24 3/16? I'm surprised you don't have a set of left hand bits. Not that I've had any success with my LH index grin2


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

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Thick oil is better grin2
Re: Siezed set screw removal [Re: JHZR2] #4585673
11/26/17 03:21 PM
11/26/17 03:21 PM
Joined: Jan 2003
Posts: 3,203
Southeastern, PA
Rick in PA Offline
Rick in PA  Offline

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Southeastern, PA
I'd keep up-sizing the drills gradually. If you get lucky, the threads on the old set screw can be picked out like a spring. I've seen it done. Then clean up the threads on the door knob with a tap of the same size threads and you're good-to-go.

That was a popular style door knob. We have the same ones in our house.

Last edited by Rick in PA; 11/26/17 03:23 PM.

A wise man told me:
"Heat is your friend." and "Any oil is better than no oil."
Re: Siezed set screw removal [Re: Merkava_4] #4585689
11/26/17 03:47 PM
11/26/17 03:47 PM
Joined: Dec 2002
Posts: 42,846
New Jersey
JHZR2 Offline OP
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Originally Posted By: Merkava_4
That's the wrong kind of extractor. What those kind do is exert outward force on the fastener as you turn it to the left. Counterproductive is the word I use to describe those kind of extractors.


Yup, observed that, though from one of the "seen on tv" types HD sells. Thought a more aggressive taper (get fatter in shorter distance) was good given that I can't get the rod out.

The brass gave easily as a result.

So what is the better kind of extractor. For me and for this sort of a job I certainly don't mind paying good money upfront to have the right tool and do a proper job with minimal hang ups.

I like DIY and on Sunday my time isn't money, but I don't care to waste my day if there's a better tool.

Re: Siezed set screw removal [Re: andyd] #4585692
11/26/17 03:48 PM
11/26/17 03:48 PM
Joined: Dec 2002
Posts: 42,846
New Jersey
JHZR2 Offline OP
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Originally Posted By: andyd
Back that extractor out before it snaps. Continue to drill going up in size gradually until there is no screw left. Then tap, I would use the smallest over size possible. a 10-32, 12-24 3/16? I'm surprised you don't have a set of left hand bits. Not that I've had any success with my LH index grin2


Don't have left hand bits. But then again, my 1950s dp is one way only smile

Re: Siezed set screw removal [Re: Rick in PA] #4585725
11/26/17 04:08 PM
11/26/17 04:08 PM
Joined: Dec 2016
Posts: 8,474
Waco, TX
Linctex Online content
Linctex  Online Content

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Waco, TX
Originally Posted By: Rick in PA
I'd keep up-sizing the drills gradually. If you get lucky, the threads on the old set screw can be picked out like a spring. I've seen it done.


Exactly - it just takes time, precision.... and a LOT of patience.

It saves the original threads.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Siezed set screw removal [Re: JHZR2] #4585729
11/26/17 04:10 PM
11/26/17 04:10 PM
Joined: Dec 2016
Posts: 8,474
Waco, TX
Linctex Online content
Linctex  Online Content

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Waco, TX
Originally Posted By: JHZR2

So what is the better kind of extractor. For me and for this sort of a job I certainly don't mind paying good money upfront to have the right tool and do a proper job


this kind:



"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Siezed set screw removal [Re: JHZR2] #4585746
11/26/17 04:26 PM
11/26/17 04:26 PM
Joined: Dec 2002
Posts: 42,846
New Jersey
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Is there a name for those?

Even snap on seems to be selling spiral/multi-spline types.

Re: Siezed set screw removal [Re: JHZR2] #4585865
11/26/17 05:46 PM
11/26/17 05:46 PM
Joined: Dec 2002
Posts: 42,846
New Jersey
JHZR2 Offline OP
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Drilled out to #7 then tapped to 1/4-20. Success.

It was crooked, not sure how I could do that better - I was a bit sensitive to clamping the handle in a vice.



Re: Siezed set screw removal [Re: JHZR2] #4585891
11/26/17 06:03 PM
11/26/17 06:03 PM
Joined: Mar 2015
Posts: 12,750
In the shop
53' Stude Online content
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In the shop
Very nice work and fix sir smile



Re: Siezed set screw removal [Re: JHZR2] #4585892
11/26/17 06:05 PM
11/26/17 06:05 PM
Joined: May 2010
Posts: 10,094
out there
spasm3 Offline
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out there
Nice work! I would not have clamped it in a vise either. Crooked won't matter for that, with the set screw in, you will never know.


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