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Tool How to drive taps

Tool
DPittman said:
That's my intial feeling too but others personal experiences say that I might question why they are having success.
Click to expand...

I don't question it all. Of course it's going to work 9 times out of 10, and maybe 98% of the time in big holes or soft metals. That might be enough to instill confidence in some. But I hate extracting broken taps - even if only rarely. My instincts and engineering background all say it's a bad idea, so until I read a manufacturer's instructions advising the use of an impact gun, I don't plan to do it. Each to their own though!
 
Susquatch said:
I don't question it all. Of course it's going to work 9 times out of 10, and maybe 98% of the time in big holes or soft metals. That might be enough to instill confidence in some. But I hate extracting broken taps - even if only rarely. My instincts and engineering background all say it's a bad idea, so until I read a manufacturer's instructions advising the use of an impact gun, I don't plan to do it. Each to their own though!
Click to expand...
Hee hee..... I don't need no steeenkin' impact to break taps..... How much worse could an impact be than me? :rolleyes:
 
Janger said:
What is that app called exactly John? I'd like to look for. an iOS equivalent.
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Tap & Drill Chart Calculator
By Greg A. Miller

Screenshot_20241030_154132_Google Play Store.jpg

Rating: 4.8 out of 5 for almost 500 reviews

Contact: [email protected]

About :

Calculate charts for various thread percentages for SAE and Metric screws

App to calculate charts for various thread percentages for standard SAE and Metric screws. Also shows hex nut size and a diagram with the screw threads to check TPI/TPMM and screw diameter.

This app requires no permissions. Please rate this app after evaluating it, it is knowing that people use and love my apps that keeps the truly free app developers producing apps.
 
Janger said:
When do you need to tap 500 holes?
Click to expand...

I've had to tap 500 holes on more than one occasion, usually it's some kind of plate to beam/has to be removable/can't weld in that area kind of affair

2 guys mag drilling and followed up by 2 guys running taps in with an impact make short work of it, usually don't shoot for huge thread % either

I don't have any pictures, there's nothing to see, usually just a couple beams with holes all over the place
 
I cringe when I think about using an impact like that. I can't understand why each impact doesn't break off a cutting edge on the tap. I always used a speed reducer to multiply my tapping force on bigger taps.
 
My initial reaction to this was to never even consider using an impact drive with a tap. But thinking about it more, I suspect that there is a certain knack to this. And if you need a lot of holes tapped quickly without a great need for high precision, and if the ratio between the depth of the threads to cut versus the size of the hole is low (a big hole through a plate) it could work well. The impact probably breaks chips pretty well, and if you don't mind breaking the occasional tooth / tap, you probably can go a lot faster without the need to reverse

I'm not planning to do it with my taps though
 
Taps are cheap, a lot cheaper than the labor cost to hand tap a large number of holes.

A job with several hundred holes and say 2 guys tapping, I would buy/get 4-5 taps to start, you will loose teeth for sure, and possibly break one or two, .if you end up with taps at the end, great, if you don't thats fine to, cost of the job

Getting taps out of a through hole isn't that big of a deal, smash off whatever bit is sticking through the bottom with a hammer (or turn it out with vise grips) and break the rest up with a center punch, 5 maybe 10 minutes, in the realm of hundreds of holes you are still way ahead

Machine taps work much better for this than hand taps, and of course the newer impact taps even better

Impacting isn't for every situation, but it does work well in the right application
 
Susquatch said:
Tap & Drill Chart Calculator
By Greg A. Miller

View attachment 53585

Rating: 4.8 out of 5 for almost 500 reviews

Contact: [email protected]

About :

Calculate charts for various thread percentages for SAE and Metric screws

App to calculate charts for various thread percentages for standard SAE and Metric screws. Also shows hex nut size and a diagram with the screw threads to check TPI/TPMM and screw diameter.

This app requires no permissions. Please rate this app after evaluating it, it is knowing that people use and love my apps that keeps the truly free app developers producing apps.
Click to expand...
iOS rough equivalent is an app called iEngineer, free for imperial dimensions but $3 to include metric fasteners

 
I would avoid using an impact. Had an employee clamp a tap in the vise and then use an impact and socket to run 1/2" nuts on and off to clean up threads. So these (obviously) already had threads in them. After about 50 nuts, the tap was completely toast. Sharp cutting edges were now rounded.

Andrew
 
I can't imagine it being any harder on an edge then an interrupted cut on say a lathe using hss.

I know you will say, well that is hard on an edge....but you still do it :p
 
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