A question about threads

[G code]

At one time an engineer at my company put on a print to tap from the back or it would be left hand threads. Is this true?

 

[SilveradoHauler]

Best laugh I have had in years.

 

[plastikdreams]

At one time an engineer at my company put on a print to tap from the back or it would be left hand threads. Is this true?

100% true, if you use a left hand tap from the top of a part you get right hand threads. It's based on asme standard iD10t 2016-a

 

[ostie01]

100% true, if you use a left hand tap from the top of a part you get right hand threads. It's based on asme standard iD10t 2016-a

You van use a left had drill to reverse this

 

[plastikdreams]

You van use a left had drill to reverse this

Only if it's a double split 180° drill

 

[michiganbuck]

Perhaps even better for that job..don't use a tap at all but do it on a lathe and make a double thread.

That way you can use a right or left hand screw. going in from the front or the back side...

so iD10t 2016-a... x2

 

[DDoug]

At one time an engineer at my company put on a print to tap from the back or it would be left hand threads. Is this true?

Yes.

But with modern thread milling, you can make the proper thread by rapiding
into the hole, and then helical interpolate your way up/out.

 

[litlerob1]

At one time an engineer at my company put on a print to tap from the back or it would be left hand threads. Is this true?

NO, obviously it is not true. I see that you are only one post in, so I don't know how sarcastic you are being.

Think of the Tap like a Die, it doesn't lose it's shape, no matter how you use it. So IF you use a right hand tap, you get a right hand Thread.

R

PS. See 9100, not always.
PSS. Donald Trump is a nice person

 

[michiganbuck]

At one time an engineer at my company put on a print to tap from the back or it would be left hand threads. Is this true?

Actually..NO it will be a right hand thread if tapped with a right hand tap..screwing in from the top or bottom you would use a right hand screw....

But if you tap it and then surface grind the other side it is anybodies guess,

The proof of this is summed up as: What is the difference between an orange and a bicycle? and which one came first?

 

[Milland]

PSS. Donald Trump is a nice person

Oooh, now you're just waving a big red flag.

With a Hammer and Sickle on it...

 

[atex57]

Had a guy bring in an auger with bad flighting and some new to put on. I told him it was the wrong hand so he told me to turn it around...........

Ed.

 

[SalemRule]

At one time an engineer at my company put on a print to tap from the back or it would be left hand threads. Is this true?

No, they would not be Left-Hand Threads.

 

[gustafson]

unless you used a left handed tap wrench to tap them

 

[plastikdreams]

unless you used a left handed tap wrench to tap them

Well now...what if you use a left handed metric tap wrench on a npt tap?

 

[iwananew10K]

it is true if you are south of the equator.

 

[Illinoyance]

I think it all depends on the operators BAC.

 

[gustafson]

it is true if you are south of the equator.

what if you are standing on the south pole

 

[iwananew10K]

well, obviously then the print would have to be reversed.

 

[Bill D]

I think this what is called Fake Tapping

 

[Mike1974]

Maybe there was some confusion about tapping from both sides...? If you tried to tap from both sides, you couldn't get the threads to line up, but that is my best guess about this topic.