I see your M30 tap, and raise you to 2-1/2" x 8.
Posted Nov 27, 2019, 8:43 PM UTC
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Are we doing taps again? 3.665" x 8 https://i.imgur.com/NLYa2dp.jpg
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Big boi has seen better days.
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I don't remember when was the last time we have used it.
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Tell me you turn that by hand and a 50 foot cheater bar
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Ok. I turn this by hand with a 50’ cheater bar.
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I turn it by hand without the tap wrench or cheater bar. It's not that hard to roll it around in your hands.
I ain't stupid enough to try actually tapping a hole by hand with it.
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Don’t know what the american numbers mean but thats sure is a big one
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63.5mm diameter x 8 threads per inch (25.4mm)
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It’s around 64 x 3
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I find it fascinating that you live in a place where you don’t know both systems. Where do you hail from?
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Eg continental Europe is exclusively metric. (Apart from the occasional American import.)
Most of the world is mostly metric (apart from American imports.)
Funny enough, American pints are smaller than British pints.
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The metric pipe and hydraulic fittings are junk. You would be surprised how many European machines use SAE and JIC fittings with imperial measurements.
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Meanwhile, at the tiny end of the boiler plant scale from where u/tugboateng lives, commercial espresso machines are all BSPP inside... even the ones that are made in the USA for use in the USA. The components (pressurestats, solenoid valves, vacuum breakers, etc) are somewhat standardized and interchange across manufacturers a lot more than you’d think, so it kind of makes sense that there is no fraction for anyone in changing standards.
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Yes. Though OP commenter might not be enough into this kind of stuff in the first place to be familiar with it? Don't know.
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I would be surprised... I work in the US for a European company and the predominant threads are metric followed by British. Very few if any offer SAE fittings... This is true for Asian markets as well.
To say “metric pipe and hydraulic fittings are junk” is patently false.
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Canadian pints are 20 fl oz
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You guys are blowing my mind here. A pint of beer in the US is 16oz. Are you saying this is not a universal measurement? I thought everything in the US is bigger? Now your saying I’m getting shorted???
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Aren't Canadian pints imperial quarts?
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Fluid ounces also differ in size between UK and US.
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In Denmark, inch thread is common in water pipes but otherwise not so much. I just didn’t get what the numbers meant as normally they are just called 3/4” thread or M20x1,5 thread etc.
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I understand that nobody else uses imperial, but it’s fascinating that others don’t even have a basic understanding of the system. The concept that 1 inch = 2.54 cm seems so universal to me. We are so used to being bilingual here.
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Why wouldn’t you just use a boring bar and a thread insert (After a drill of course)? Is this seriously for hand tapping?
Edit: only thing I can think of is it’s to make the deep coarse threads but fine threads actually have more axial holding capability.. so why make coarse? Tolerances less important when some things are that big? I ask cause I make a threaded bore for a car part where I work and it’s done via a boring bar and g code
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2 things come to mind. But let me first say that I would single point thread this with an insert long before I would try that tap. If on a mill, threadmill it. However, tapping is faster and could quite easily save a company boatloads of money over a long run. Also, I’ve done thread repair on ID threads in the past, and I would have killed to have a tap instead of picking up the existing threads.
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This is why I didn’t get it. I do setups like once a day for different parts on one machine. The best part is that we use the same casting for both
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I honesty hate taps even doing like 1/4-20 cause I get to do it on heat treated steel or ductile cast iron. So I snap brand new tools in half or sometimes I get an end mill that lasts like 80 minutes.
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2 things. Often taps these big and bigger are used to chase a thread on repair work.
The thread is actually not UNC but UNS (special if you don’t know), threads over 1 inch can all be 8 tpi.
I’ve had to chase some 5” threads before with a 5” UNS -8 tap before. Had to make a custom tap wrench and find some extra muscles to turn it.
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Taps of this size would be needed for work peices that are too large or too costly to move. Think heavy machinery and large stationary equipment type things. If the project can't come to the shop, the shop must go to the project.
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mostly repair work for something like this
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Sweet lightsaber
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Why is everyone on reddit always playing poker?
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If the ladies don't find you handsome at least they'll find you handy.
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When your ear wax problem is really bad
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Why? (Whole comment is sarcasm) Wouldn't it just be cheaper to buy a lathe big enough than to buy all of the taps that will break in one hole?
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Just found my Christmas present for the old lady.
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Jesus fuck me 'g'day! Wonder if 'ol uncle bumblefuck has a vijeo on removing this busted tap?
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Just put some alum from the grocery store on it. Clear it right up
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Ok home gamer here, and an amateur at that. Do more flutes on a tap make it harder or easier to start straight? Also my understanding is that a tap that isn't tapered much would usually be a chase, or used to clean the bottom of a blind hole. Could you actually start threading a hole with something like the tap OP posted?
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I'm pretty sure fluting or tapering on a tap that big doesn't matter. A machine is gonna be using that lol
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How hot that shit must get.
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Would hate to break that tap.
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The crazy thing about all these big taps is that there is a big bolt to follow through with.
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With my luck, I'd put the slightest pressure on it and still snap that thing in half.
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A bottoming tap, no less.
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Ahh nice! I found one of those a year or so ago that my uni’s MechE building was throwing away. It’s an absolute unit!
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Holy fuck how much would that run out your wallet?
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The owner of the tap told me he bought it long time ago for around $500.
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That’s a touch too big for my tap handle. I better check the snap-on truck.
15” crescent wrench will fit. 😂
But do they have an adapter for my 1/2" impact?
I've never hated myself enough to use an impact for tapping, but a cordless drill with a clutch is almost like cheating... until the tap breaks.
Why break taps by hand when you can get a machine to break them for you?
Not sure if the truck is strong enough for this.