www.stationaryengineforum.net
Please log in , the forum is open to guests who are now able to view every section, feel free to become a member , you will then be able to post and reply to topics.

Broken tap removal.

View previous topic View next topic Go down

Broken tap removal.

Post by Locknut on Thu Apr 10 2014, 07:47

Hi All,
I have just snapped off a 5/16 BSF tap in a thread hole just below the surface -Help! I have tried to drill it but my drills wont touch it. Any ideas on how I can get the broken bit out? Thanks.
Kev.

Locknut
A true Stationary engine owner
A true Stationary engine owner

Posts : 166
Join date : 2013-02-20
Location : South Devon

Back to top Go down

Re: Broken tap removal.

Post by Villiers on Thu Apr 10 2014, 07:50

This should be interesting!!!!

You will swear a lot getting this out I reckon. What is it in? BSF is an uncommon thread. You "might" and all these are "might" be able to tap it back with a small punch, you could try welding a nut to it, maybe getting small pin nosed pliers down to turn it...

Villiers
Life Member
Life Member

Posts : 974
Join date : 2010-01-02
Age : 48
Location : Just outside Diss

http://www.rcoleplumbingservices.co.uk/

Back to top Go down

Re: Broken tap removal.

Post by Locknut on Thu Apr 10 2014, 08:09

Thanks for getting back to me so soon.
It is in a cast iron engine block from a Stuart Turner R2.I have tried using a small punch but there is not enough room to use it effectively.I hadnt thought about pliers - I used mole grips on the small piece that was proud of the surface but that just broke away!As you say this will be interesting!!
Kev.

Locknut
A true Stationary engine owner
A true Stationary engine owner

Posts : 166
Join date : 2013-02-20
Location : South Devon

Back to top Go down

Re: Broken tap removal.

Post by NoelA on Thu Apr 10 2014, 11:55

Hi welding a nut won't work in this case the heat will make it brittle.
If you don't get any where and really are struggling, search for a local engineering shop that does spark errosion.

NoelA
Born to be wild
Born to be wild

Posts : 41
Join date : 2014-03-08
Age : 38
Location : Leicestershire

Back to top Go down

Re: Broken tap removal.

Post by Locknut on Thu Apr 10 2014, 18:41

Hi All - an update - I gave the broken tap a good squirt of freeing fluid then tried, as Villiers suggested,  some thin long nosed pliers after a bit of wriggling it moved a little, just enough to be able to get a thin punch to bear.After tapping it for ages it slowly unwound and I was able to remove the bits.Phew- was I ever relieved!! I wasn't first in the queue when luck was handed out but every so often the Gods take pity on me and give me some - this was one of those rare occasions! Thanks for your input guys.Kev.

Locknut
A true Stationary engine owner
A true Stationary engine owner

Posts : 166
Join date : 2013-02-20
Location : South Devon

Back to top Go down

Re: Broken tap removal.

Post by NoelA on Thu Apr 10 2014, 18:51

So glad you sorted it, worth it just so you feel smug!

NoelA
Born to be wild
Born to be wild

Posts : 41
Join date : 2014-03-08
Age : 38
Location : Leicestershire

Back to top Go down

Re: Broken tap removal.

Post by steve w on Fri Apr 11 2014, 18:27

glad its out - I have done this a few times and its never easy to remove them I have in the past had to melt one out with my tig welder.

steve w
A credit to the forum
A credit to the forum

Posts : 498
Join date : 2012-09-15
Age : 44
Location : Nr Wolverhampton

Back to top Go down

Re: Broken tap removal.

Post by AnotherBigAl on Wed Apr 16 2014, 20:03

I would had to resort to looking for a spark erosion machine so very well done. Take a well earned pat on the back, or maybee just a small drink....

That was a good idea with the punch. I wouldn't have thought of that. I have often wondered why left hand drills are not so easy to get hold of. Reasoning that even if they won't actually drill the tap or stud out maybe the 'unscrew' vibration will help.

AnotherBigAl
Born to be wild
Born to be wild

Posts : 13
Join date : 2013-11-27
Location : South West Wales

Back to top Go down

Re: Broken tap removal.

Post by Sponsored content Today at 13:43


Sponsored content


Back to top Go down

View previous topic View next topic Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum