How to cut an internal thread in 3 steps by hand
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- Опубликовано: 24 май 2018
- Go to our website to read our post:
ruko.de/en/blog/how-to-cut-an...
The most common connection is still the screw connection. To screw a screw into a workpiece, you need an internal thread.
In this video we show you how to cut an internal thread in steel in only three steps.
What you need:
- Safety goggles
- Twist drill
- 90° countersink
- Hand tap
- Adjustable tap wrench
#HandTap #InternalThread #ShareTheFascination 
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Thank you so much. You've done me such a great service. Major solid to you, buddy!
Glad we could help!
simple and educative..
thank you !!
After the chamfering and first start up using hand double check that piece and the tap are perpendicular then use the tool for the tap and the first thread instead of using the tool to avoid swinging and to prevent the start up damage.
Wonderful demo! Is it possible to do internarnal thread only by manually, with no drill machine, which u do before hand drill.
Hello! We are sorry, but you have to drill a hole with a drilling machine beforehand.
What did u spray ? Is that necessary ? And from where i can get this tapping set?
Can we cut an internal thread in a rod using this method ?
and do you have any tips for doing that
Thank You
Why do you check with a tri-square? The tap is going to follow the hole. Checking angle is only necessary when cutting external threads with a die.
Q about measurements. What is the ratio of hole size to screw size. For instance, if I want to cut a threaded hole to accept a 1/2" bolt, what size pilot hole would I drill? I am assuming something smaller than 1/2". Is that right?
Correct.
The exact formula for the hole is: core hole diameter = thread diameter - thread pitch.
Blog here: ruko.de/en/blog/how-to-cut-an-internal-thread
Here is the PDF with the overview for metric threads: ruko.de/assets_ruko/downloads/RUKO_thread_tabel.pdf
Perfect, was looking for the right sequence to use 3 taps... 1 ring, 2 rings, no ring...
You start with the tap with the least number of full threads at the top of the tap and work your way to the one with the most.
What about info on what size whole to drill for size of thread? M8, M10 etc
Hello Bazz,
You can find out the diameter of the core hole in our blog (link is in video description) including a PDF with all diameters ( ruko.de/assets_ruko/downloads/RUKO_thread_tabel.pdf ).
The diameter of the twist drill for tapping is calculated:
Tap diameter - Thread pitch = Core hole diameter
Example using the M8:
Core hole diameter = 8 mm - 1.25 mm = 6.8 mm
Hope we could help you.
Have fun threading.
Why 3 diferent taps? Whats the difference between them? Thanks
@@RUKOGmbH hey I'm so sorry you sent me this response 2 years ago, and for some reason I've only just seen it, many thanks for taking the trouble, sorry I didn't notice earlier.
I need to do this on PVC. Same process?
Yes, it's the same process.
It is possible to cut an internal thread on car cast iron block by hand?
Hello Anu Gila,
Yes, it is possbile to cut an internal thread on a car cast iron block by hand.
Please check out our hand taps: ruko.de/en/products/hand-taps
Taps made of high speed steels (HSS) can be used, but HSSE-Co 5 (with a cobalt content of 4,8 - 5 %) is better.
Hope we could help.
@@RUKOGmbH Thank you sir.
iv tried like 3-4 times threading a pipe. imposible to get it straight..
Cool vid, it's Tri-square though.
technically it's an engineers square as it is made completely out of metal, a tri square is used for wood, and the base is made out of wood.
And it's useless using one if no explanation is given what to do when you're off.
the try square cannot ensure accurate perpendicular tapping
My set has only one tap per size not 3 will it still work ?
Yes, it will also work.
Just make sure you break the chips by turning back a third turn (as shown in the video). Also please don't forget to use coolants and lubricants.
@@RUKOGmbH thanks for replying means a lot stay safe have a good holiday season hi from Ireland
@@davidpyper82 Thank you a lot! You also stay safe and happy holidays (from Germany).
You did not specify the screw size in mm(international world wide standard) matching the drill bit size.
Hello Farafaddia,
You can find the diameter of the core hole and the screw size (e.g. M10) in our blog (link is in video description) including a PDF with all diameters ( ruko.de/assets_ruko/downloads/RUKO_thread_tabel.pdf ).
Hope this helps.
why use 3 taps instead of 1?
Hello MrBoomtheroom, Thank for your question.
With 3 taps, you get a nice clean and more precice thread with not much effort.
Single-cut taps (1 taps) are usually used for fast and "dirty" cuts - if you don't have much time.
It's also harder to cut with them because you have to cut more material at once.
Hope we could help.
Why three taps?
Here you´ll find the answer to your question: ruko.de/en/knowledge/know-how/six-features-of-internal-taps-at-a-glance
salUDOs
By hand? Uses a drill stand ha ha
Useless video, no info about measurement....
lol
Are you always so reasonable?
Yes always.... If you are talking about only engineering, otherwise....