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23rd Nov 2020, 08:46 AM #1Senior Member
- Join Date
- Dec 2014
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- Tasmania
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- 102
Hercus 9" elbow oiler gits - thread type
Hi all,
I purchased an elbow oiler git, the toilet seat type, to replace one which appears to have been sheared off many years ago by a previous owner on the apron. Initially I tried to see if I could unscrew the remains of the old one by using a punch or drift to get it rotating but it wont budge and I stopped before I made a dogs breakfast of things.
Potentially I could use an easy-out but I am concerned with it being very soft metal this might just chew up and make matters worse. I believe the best course of action will be to drill it out and re-tap the thread. The only thing is apart from measuring the new oiler to be 26tpi I don't know the other dimension. I can't seem to find any info on it either. The new one appears to be a tapered thread. I don't have any taps anywhere near that size with a fine thread so I will have to purchase one for the job.
Appreciate any help if somebody knows!
Cheers,
ratters
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23rd Nov 2020, 12:08 PM #2Golden Member
- Join Date
- Oct 2008
- Location
- Cairns, Q
- Posts
- 666
Are you sure of the thread count? I would expect the thread would be either 1/8 BSP (28 TPI) or 1/8 NPT (27 TPI)
If it is one of these you can identify it by googling "BSP thread dimensions" or "NPT thread dimensions", which should give you the outside diameter of the thread and also the tapping sized drill, which will give you a guide to the drill size to use it you decide to drill the broken piece out.
Frank.
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24th Nov 2020, 01:07 AM #3
Hi Ratters, Guys,
Use the square tang of a file to get the remains of the old part out ! Gently tap the blunt end of the file in with a hammer and unscrew the carcass. You might have to grind a bit of the tang to get it to fit.
I've removed a number of broken and damaged threaded parts this way. The four sharp corners of the tang dig in and allow you to unscrew the part.Best Regards:
Baron J.
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24th Nov 2020, 09:37 PM #4australian metalworking hobbyist
- Join Date
- Jan 2009
- Location
- Holbrook, NSW
- Age
- 73
- Posts
- 490
the ones I make for the Hercus lathes are 3/8 brass threads, 26tpi.brass thread chart.jpg
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25th Nov 2020, 10:18 AM #5Senior Member
- Join Date
- Dec 2014
- Location
- Tasmania
- Posts
- 102
Thank you everyone for the replies. And guess what, I am an idiot. I should have looked at some comparison photos earlier, the oiler git was not sheared off, it never existed. Apparently the oil hole for the half nuts is just a piece of copper tube, no git for whatever reason. Perhaps it was deemed to be in the way of things. Feeling rather foolish now..
Cheers!
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