Stripped bolt extraction...drrrrrat! Update...it's freeeeeee

[Chris_D]

Went to take off the DISA today and stripped one of the TORX40 bolts holding it in place. What a plonker! Teach me to buy cheap tools from ebay.
Any tips on bolt extraction? Anyone had to do it before or am I the only gonzoid to get into this kind of kerfuffle?
Have ordered some bolt extractors from Amazon but any tips on what NOT to do during extraction process..?

',,,nuuuuuuuuuu!'


These any good?

 

[pvr]

The last bolt I rounded, I had to drill out :x

 

[Grumpyowl]

Chris have you run over and killed your neighbours black cat ?

 

[Yorkie Z]

A decent pair of mould grips should get that out. Careful with the stud extractor, if you've not used them before you can really f**k it up mate.

 

[Chris_D]

Chris have you run over and killed your neighbours black cat ?

omg, i wasn't superstitious before i bought this blinkin motor - I MUST be jinxed!

 

[Chris_D]

A decent pair of mould grips should get that out. Careful with the stud extractor, if you've not used them before you can really f**k it up mate.

i'd never get the mould grips in there cos of the recess.
I'm gonna come a bigger cropper with these extractors. I just know it.
Could kick myself - new tungsten carbide torx set arrived by post as i was under the bonnet messing up the bolt - used my crappy old soft ones off ebay.
What a twonk!

 

[Chris_D]

The last bolt I rounded, I had to drill out :x

I think drilling it out is my only viable option at this point. Cant even grind the sides to spanner out cos of the recess in the DISA. It's the top bolt.

 

[Ducklakeview]

Do you have a "dremmel" or similar? If so, pop a disc on it, and cut a slot in the head, so you can get a wide flat screwdriver (or bit) in there, failing that, a junior hacksaw blade will do the same job. However, I'd be grabbing a centre punch and using it to "tap" the edge anticlockwise, something that has worked well for me on small fastenings over the years..

Mike

 

[Machine monkey]

Bloody hell mate. You would have saved your self £££ and stress going to a garage recently!!

As yorkie says very careful with the extractors. Basically if you screw that up then you are up the creak without a paddle!! If you cant get grips on it i cant see how you will be able to drill the hole to get the extractor in? If can file flats on to it so you could fit an adjustable? or file a shape and tape on a socket?

Withe the extractors i find it easier to use a tee wrench. Normally used for tapping holes. Instead of using a spanner. With a tee wrench you can keep the extractor straight wile applying pressure and turning.

 

[Machine monkey]

Do you have a "dremmel" or similar? If so, pop a disc on it, and cut a slot in the head, so you can get a wide flat screwdriver (or bit) in there, failing that, a junior hacksaw blade will do the same job. However, I'd be grabbing a centre punch and using it to "tap" the edge anticlockwise, something that has worked well for me on small fastenings over the years..

Mike

Good advice that. Also try getting the cheap set and tapping in any other bit that fits.

 

[Chris_D]

Do you have a "dremmel" or similar? If so, pop a disc on it, and cut a slot in the head, so you can get a wide flat screwdriver (or bit) in there, failing that, a junior hacksaw blade will do the same job. However, I'd be grabbing a centre punch and using it to "tap" the edge anticlockwise, something that has worked well for me on small fastenings over the years..

Mike

Thanks Mike,
Have a dremmel and will try that tomorrow. It's too hot to continue with in the sun today so i've called time.
Car will be in the shade until 12pm tomorrow so I'll be up first light to tackle it.
Gives me time for a few practise runs on some bolts, drilling and cutting in a flathead screwdriver recess.
Thanks for suggestions all!

 

[Chris_D]

Do you have a "dremmel" or similar? If so, pop a disc on it, and cut a slot in the head, so you can get a wide flat screwdriver (or bit) in there, failing that, a junior hacksaw blade will do the same job. However, I'd be grabbing a centre punch and using it to "tap" the edge anticlockwise, something that has worked well for me on small fastenings over the years..

Mike

Good advice that. Also try getting the cheap set and tapping in any other bit that fits.

Thing that puts me off tapping in a smaller torx bit is that its for the DISA which I know is a little sensitive. I've had it off previously for an inspection and all seems fine but still, theres electronic jiggery pokery going on in that thing and I dont really want to risk damaging it.
Might become a last resort tho......

 

[Ducklakeview]

Do you have a "dremmel" or similar? If so, pop a disc on it, and cut a slot in the head, so you can get a wide flat screwdriver (or bit) in there, failing that, a junior hacksaw blade will do the same job. However, I'd be grabbing a centre punch and using it to "tap" the edge anticlockwise, something that has worked well for me on small fastenings over the years..

Mike

Good advice that. Also try getting the cheap set and tapping in any other bit that fits.

Thing that puts me off tapping in a smaller torx bit is that its for the DISA which I know is a little sensitive. I've had it off previously for an inspection and all seems fine but still, theres electronic jiggery pokery going on in that thing and I dont really want to risk damaging it.
Might become a last resort tho......

Mat, I meant using the tip of the punch to "drive" the edge of the head anticlockwise, not banging in a smaller bit.

Mike

 

[Machine monkey]

Good advice that. Also try getting the cheap set and tapping in any other bit that fits.

Thing that puts me off tapping in a smaller torx bit is that its for the DISA which I know is a little sensitive. I've had it off previously for an inspection and all seems fine but still, theres electronic jiggery pokery going on in that thing and I dont really want to risk damaging it.
Might become a last resort tho......

Mat, I meant using the tip of the punch to "drive" the edge of the head anticlockwise, not banging in a smaller bit.

Mike

I know what you mean Mike i was just suggesting that if the OP has a selection of bits there might well be one close enough to tap in. And get just enough to undo it to get it moving?

 

[Chris_D]

Good advice that. Also try getting the cheap set and tapping in any other bit that fits.

Thing that puts me off tapping in a smaller torx bit is that its for the DISA which I know is a little sensitive. I've had it off previously for an inspection and all seems fine but still, theres electronic jiggery pokery going on in that thing and I dont really want to risk damaging it.
Might become a last resort tho......

Mat, I meant using the tip of the punch to "drive" the edge of the head anticlockwise, not banging in a smaller bit.

Mike

Oh i see what you mean.
Well, I'll be using one of the larger extractors on the existing 'stripped' hole if it fits ok and failing that will have to drill out as straight as possible to use one of the smaller extractors.

 

[Chris_D]

Bloody hell mate. You would have saved your self £££ and stress going to a garage recently!!

As yorkie says very careful with the extractors. Basically if you screw that up then you are up the creak without a paddle!! If you cant get grips on it i cant see how you will be able to drill the hole to get the extractor in? If can file flats on to it so you could fit an adjustable? or file a shape and tape on a socket?

Withe the extractors i find it easier to use a tee wrench. Normally used for tapping holes. Instead of using a spanner. With a tee wrench you can keep the extractor straight wile applying pressure and turning.

I know....beginning to think the local indie would have been the better option now.
I'm not giving up tho...this is a mere blip....on the way to a running zed. lol. gotta be optimistic.

 

[ekimj10]

Those stud extractors aren't too bad to use, so long as you have access to drill a hole central to the bolt axis.
You need a very good centre punch accurately placed as near as you can to the centre, I would start with the smallest one first, select a drill to suit and as others have said, use a tee bar or tap wrench to ensure equal loading on each side when you turn.
Lashings of penetrating oil 'Plusgas' or similar, leaving overnight if you can.
Do you know what the material of the stud and casing is as there are other techniques if this doesn't work.
Good luck to you, if in doubt do 'nowt' and take it to someone who is familiar, there are risks involved, drill slipping, extractor snapping to name two.

 

[Machine monkey]

Thing that puts me off tapping in a smaller torx bit is that its for the DISA which I know is a little sensitive. I've had it off previously for an inspection and all seems fine but still, theres electronic jiggery pokery going on in that thing and I dont really want to risk damaging it.
Might become a last resort tho......

Mat, I meant using the tip of the punch to "drive" the edge of the head anticlockwise, not banging in a smaller bit.

Mike

Oh i see what you mean.
Well, I'll be using one of the larger extractors on the existing 'stripped' hole if it fits ok and failing that will have to drill out as straight as possible to use one of the smaller extractors.

I would think you will be very unlikely for one to fit and bit into whats there. You usually have to drill them a bit 5mm of depth for them to bit. I work at a physics department in a training workshop. I see quite a few rounded and broken heads. We always try every other option before getting the easy outs out and drilling. We dont very often have to use them. I would be doing like Ducklakeview has suggested or myself and Yorkie first.

 

[Machine monkey]

Bloody hell mate. You would have saved your self £££ and stress going to a garage recently!!

As yorkie says very careful with the extractors. Basically if you screw that up then you are up the creak without a paddle!! If you cant get grips on it i cant see how you will be able to drill the hole to get the extractor in? If can file flats on to it so you could fit an adjustable? or file a shape and tape on a socket?

Withe the extractors i find it easier to use a tee wrench. Normally used for tapping holes. Instead of using a spanner. With a tee wrench you can keep the extractor straight wile applying pressure and turning.

I know....beginning to think the local indie would have been the better option now.
I'm not giving up tho...this is a mere blip....on the way to a running zed. lol. gotta be optimistic.

Good on ya its character building and learning

 

[Chris_D]

Mat, I meant using the tip of the punch to "drive" the edge of the head anticlockwise, not banging in a smaller bit.

Mike

Oh i see what you mean.
Well, I'll be using one of the larger extractors on the existing 'stripped' hole if it fits ok and failing that will have to drill out as straight as possible to use one of the smaller extractors.

I would think you will be very unlikely for one to fit and bit into whats there. You usually have to drill them a bit 5mm of depth for them to bit. I work at a physics department in a training workshop. I see quite a few rounded and broken heads. We always try every other option before getting the easy outs out and drilling. We dont very often have to use them. I would be doing like Ducklakeview has suggested or myself and Yorkie first.

Yah, looking at vids on youface its very easy to see how it can go wrong.
So, initial practice run on a sacrificial bolt are proving encouring for the flat-head screwdriver slot/recess method - thanks mike!
Bit messy for a first-off. Few more practices and i should be good to go!
Thx all for your tips and tricks!
Loving zed ownership if only for such a friendly helpful community in dealing with my cack-handed mechanic shennanigans!
:lol: