Part built Allchin 1.5 inch

[Paul KempParticipant @paulkemp46892]

Derek,

Screwed or studded, it won't be a push fit. With changes of temp and pressure nothing on a boiler / steam system will be a push fit.

Paul.

[derek blakeParticipant @derekblake72550]

Sorry Paul, what I meant was the stub is a push fit into the bush and then I will add the four fixing studs.

what I meant was I couldn’t see a part in the drawing that says you need to make it a screw in fixing.

the bush hole was over 1/4×40 already so I machined the stub to fit into the bush.

i will then fix with the suds, I just wondered how well it would seal.

Regards

Derek

[JasonBModerator @jasonb]

Just a plain 1/4" spigot to help line things up just like the shorter one on the pipe flange on the other end of the clack and pipe frpm pump. The four studs will hold it in place.

[derek blakeParticipant @derekblake72550]

Perfect, thank you Jason

[derek blakeParticipant @derekblake72550]

Anyone who’s how to remove broken 10ba tap? I was tapping fixing and it snapped in the bush

Regards

Derek

[derek blakeParticipant @derekblake72550]

[derek blakeParticipant @derekblake72550]

I removed to section of tap but piece stuck down the hole and you can’t drill taps especially this size, I will have to use 3 fixings and make one stud a dummy, pain in the bum, first tap broken in the whole build.

[Clive Brown 1Participant @clivebrown1]

Posted by derek blake on 27/10/2019 10:58:04:

Anyone who’s how to remove broken 10ba tap? I was tapping fixing and it snapped in the bush

Regards

Derek

I'd definitely try to remove it. Nitric acid, brick cleaner or alum will do the job. Search this site or google for "broken tap".

[SillyOldDufferModerator @sillyoldduffer]

Posted by Clive Brown 1 on 27/10/2019 14:16:25:

Posted by derek blake on 27/10/2019 10:58:04:

Anyone who’s how to remove broken 10ba tap? I was tapping fixing and it snapped in the bush

Regards

Derek

I'd definitely try to remove it. Nitric acid, brick cleaner or alum will do the job. Search this site or google for "broken tap".

Alum is probably best but make sure you get the right one! Different chemicals are sold as 'Alum' for various purposes. Not all are suitable. The Alum that dissolves iron, but not copper, is Potassium Aluminium Sulphate. Accept no substitutes! ebay is your friend.

Dave

[derek blakeParticipant @derekblake72550]

Hi Dave

would this be feasible for a tiny 10ba bolt stuck below surface level?

regards

Derek

[derek blakeParticipant @derekblake72550]

I’m not sure it’s possible to soak my boiler in the Alum as it requires hot water, I’ve considered Drexel diamond tip to try and break tap up.

[Paul KempParticipant @paulkemp46892]

Derek,

Unfortunately you will have to persevere here and get the tap out as 3 studs on a 4 stud PCD will equal a leak! The diamond dental type burrs come with some very small points but you will need a steady hand! If you can nibble the centre section away the threaded sides usually drop out. 10ba is a bit tiddly though!! Good luck.

I tried Alum once didn't touch the drill I broke, obviously the wrong sort of Alum!!

Paul.

[derek blakeParticipant @derekblake72550]

Thanks Paul, I think I should of made the fitting a screw fit and used dummy studs to be honest!

i will try the Dremel trick, nothing to loose.

Regards

Derek

[derek blakeParticipant @derekblake72550]

Half hour with the dremel and no luck whatsoever, it’s like a solid plug down there so I can’t see a way or removing this tap tip.

so that opens up how I solve the fixing issue, I have three good studs inserted but will need to try and think how to solve the forth.

[derek blakeParticipant @derekblake72550]

I could try and make a damm around the bad hole with bluetac and add some Alum.

i think I’ve found it on eBay, I can’t boil or warm up so it may not work but I have nothing to loose.

[derek blakeParticipant @derekblake72550]

So I have purchased some Alum but from EBay so hopefully the right type, plasticine to make a damm around the hole and broken tap.

i cant heat the Alum up so it will just have to hopefully sit soaking for however long it takes.

i guess possible wrong Alum and cold may mean no success but it’s my only chance I think.

Edited By derek blake on 28/10/2019 20:18:13

[JasonBModerator @jasonb]

Could you redrill for a 3 hole pattern?

[derek blakeParticipant @derekblake72550]

Hi Jason

um, yes I think there would be room to do that if I can remove the already fixed studs but I’m sure that would be easy.

i will keep that as plan B then,

Derek

[Jeff DaymanParticipant @jeffdayman43397]

Jason's post got me thinking – could you maybe drill and tap a hole next door to the one with the broken tap, say .080 or .090" or so away? That way you could stay with a 4 hole fastener pattern for best chance at a robust seal. A three hole pattern would likely work but the span between bolts is that much bigger than with a 4 bolt setup. Just food for thought.

[derek blakeParticipant @derekblake72550]

Hi Jeff

interesting I did consider this option, I guess I was trying to keep things close looking to drawing and was scared to attempt yet another hole and tapping process.

this bronze bush seems very hard and was awful to tap, if this Alum truck doesn’t work which I’m not too confident on due to the fact I can’t boil it as it’s suggested I will go for option A or B

the good things is that there are options, it’s yet another bump in the road but there’s normally a way around these things.

Regards

Derek

[Richard S2Participant @richards2]

Persevere with the Alum Derek. I used it to remove a 10 BA broken tap from copper. Took a week using it cold, but came out easily.

[derek blakeParticipant @derekblake72550]

So I did try the Alum but I felt that it just wasn’t working in the situation I had so I decided to take the next step and that was to drill more fixing holes, not to drawing but functionality is what I require now.

hopefully this will keep it water tight, the hole with no stud will have a dummy fixing in the steam fixing,

[derek blakeParticipant @derekblake72550]

[derek blakeParticipant @derekblake72550]

So pump clack valve made and seems to work, still some fettling to do so will post picture soon.

boiler cladding worked on today, pleased with the outcome as I found it very tricky to keep it neat.

[derek blakeParticipant @derekblake72550]

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