8_10 Brass Cleaner
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Todaythis is what I've been doing today
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avenger
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Looks alot like hard work !
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8_10 Brass Cleaner
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| avenger wrote: | | Looks alot like hard work ! |
Nope, easy peasy, my mate 'Scud' a world renowned Motorcycle sidecar racer was expanding stay tubes. That is hard work!
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MFSteam
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That boiler is so small, it looks like a Model Boiler 
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JJ
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Re: Today | 8_10 Brass Cleaner wrote: | this is what I've been doing today
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You've been using a rotabroach type drill that spits out a slug when you're through
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8_10 Brass Cleaner
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Two different boilers.
The top is my Fowler. The bottom one is Scud's Aveling, both 8 ton rollers.
So not that small.
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Spokesmann
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Re: Today | 8_10 Brass Cleaner wrote: | this is what I've been doing today
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What exactly is the machine and what does it do? 
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8_10 Brass Cleaner
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Re: Today | Spokesmann wrote: | | 8_10 Brass Cleaner wrote: | this is what I've been doing today
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What exactly is the machine and what does it do? |
Its a mag base 'rota broach'.
See them holes (14 of them), it made them, that was the last and I had to make a plate to get it as that boss got in the way.
The magnet holds it in place, and you use a broach cutter to cut them holes out in a 1er, no using twist drills of successive sizes.
A broach is like an end mill with the middle missing, or a big and accurate hole saw if you like. I will find a pic.
here you go
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avenger
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If that the top of the firebox that your broaching if that's the expression?
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Spokesmann
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Serious looking bit of kit! 
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8_10 Brass Cleaner
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| avenger wrote: | | If that the top of the firebox that your broaching if that's the expression? |
It is, so I can fit the crown stays
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MFSteam
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| 8_10 Brass Cleaner wrote: | Two different boilers.
The top is my Fowler. The bottom one is Scud's Aveling, both 8 ton rollers.
So not that small. |
What diameter are the boiler barrels, they look about 2 foot dia.
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8_10 Brass Cleaner
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| MFSteam wrote: | | 8_10 Brass Cleaner wrote: | Two different boilers.
The top is my Fowler. The bottom one is Scud's Aveling, both 8 ton rollers.
So not that small. |
What diameter are the boiler barrels, they look about 2 foot dia. |
mine is 525mm OD, I know metric 'cos I ordered it in new fangled metric. Think Scuds is a tiny bit smaller
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MFSteam
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| 8_10 Brass Cleaner wrote: | | MFSteam wrote: | | 8_10 Brass Cleaner wrote: | Two different boilers.
The top is my Fowler. The bottom one is Scud's Aveling, both 8 ton rollers.
So not that small. |
What diameter are the boiler barrels, they look about 2 foot dia. |
mine is 525mm OD, I know metric 'cos I ordered it in new fangled metric. Think Scuds is a tiny bit smaller |
I am amazed how small they are for a full size engine, I must have been kicking around the yard at the Bluebell looking at boilers for too long
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8_10 Brass Cleaner
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Thems big railway injuns. Horrid things. Can't go to the pub on them
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MFSteam
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| 8_10 Brass Cleaner wrote: | | Thems big railway injuns. Horrid things. Can't go to the pub on them |
Now I know you don't mean that
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JJ
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Re: Today | 8_10 Brass Cleaner wrote: | | Spokesmann wrote: | | 8_10 Brass Cleaner wrote: | this is what I've been doing today
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What exactly is the machine and what does it do? |
Its a mag base 'rota broach'.
See them holes (14 of them), it made them, that was the last and I had to make a plate to get it as that boss got in the way.
The magnet holds it in place, and you use a broach cutter to cut them holes out in a 1er, no using twist drills of successive sizes.
A broach is like an end mill with the middle missing, or a big and accurate hole saw if you like. I will find a pic.
here you go
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A lot more user friendly than a mag drill thats for sure. I cut some 60mm diameter holes with my rotabroach at work into the wall of some 406mm diameter tube, quick and effective.
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8_10 Brass Cleaner
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Used one of them too, the firebox is tapered, so the sides are not square to the outer.
Soloution was to drill from the outside with relieved drills, thus:-
the drills
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JJ
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I try not to use the mag drill if I can get away with it
I made a saddle from some UB when cutting the 60mm holes in the tube wall (same aim as your improvisation with the boss). As you already know 8 out of 10, mag contact is everything when cutting, particularly when the cutting faces on the broach (ie on the camber of a pipe / tube) arent all in contact with the job until you're well into the cut.
A sixpence / dusbin lid moment
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8_10 Brass Cleaner
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A bit like this I suppose.
My saddle was a little 'Heath Robinson', but it worked.
You are right, you have to make sure the cutter doesnt wander as you start. Do you use the centre. I found sometimes you need a pilot hole the same diameter as the OD of the centre so it slots in and can't wander.
Dont forget the ointment either!
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avenger
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Interesting photos kep em coming as you progress plse
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JJ
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| 8_10 Brass Cleaner wrote: | A bit like this I suppose.
My saddle was a little 'Heath Robinson', but it worked.
You are right, you have to make sure the cutter doesnt wander as you start. Do you use the centre. I found sometimes you need a pilot hole the same diameter as the OD of the centre so it slots in and can't wander.
Dont forget the ointment either!
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My saddle has exactly the same purpose as your pictured one. I used a surplus piece of Universal Beam so as the toes sit on the camber of the tube and the web then sits square to the axis of the required hole. I then tack weld it in place. The web of the UB then provides a sound base for the magnet.
I do use the spring loaded centre but I make sure the pop mark has had a liberal does of extra large centre pop and 4lb hammer
Of course it's each to their own, I would sooner the cutter chatter of course rather than use a pilot hole for the sprung guide pin.
This has been succesful with a bank of14mm dia holes in a 193mm dia tube and the 60mm dia holes in both 356mm and 406mm dia tubes.
Theres nowt wrong with the Heath Robinson approach, it's got me out of the pooh more times than I care to remember. Improvisation, it's good for the soul
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8_10 Brass Cleaner
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More today.
Tapping crown stay holes with a borrowed 1 1/16 dia 14TPI tap. My arms were hanging off by this time, as I had done all the others. So young Adam Allison helped me out for a bit. As you can see it was dark by this point.
Fair play to him he got stuck in, and it is hard work. When he finished this one he was huffing and puffin a bit!
Not far away was Messrs Alan Schofield and James Allison tubing Alan's aveling. They had the 'windy drill' on the job. Note the 'ear goggles', noisy buisiness
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avenger
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Thanks for the pics
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Spokesmann
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Great shots! Looks like really rewarding work!
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