Threading tools

[DalboyParticipant @dalboy]

I am looking for recommendation for a insert threading tool that can hold both imperial and metric inserts, not expensive but at the same time not cheap and cheerful somewhere in the middle ground on price.

These will possibly get very little use. I do have some projects coming up that will need them. For smaller sized threads I do have plenty of taps and dies.

[DalboyParticipant @dalboy]

[Anonymous]

Threading inserts come in a range of sizes, of which the most common are 11, 16 and 22. Coarser threads tend to use the larger sizes, but any given size will cover metric and imperial, and partial or full form, threads of all specifications. As standard I use size 16. I normally buy insert holders from Cutwel. I have one size 16 external holder and size 11 and 16 internal holders. When screwcutting small (less than ~12mm) internal threads I use form tools.

Andrew

[JellyParticipant @jelly]

Posted by Andrew Johnston on 13/09/2022 11:47:12:

Threading inserts come in a range of sizes, of which the most common are 11, 16 and 22. Coarser threads tend to use the larger sizes, but any given size will cover metric and imperial, and partial or full form, threads of all specifications. As standard I use size 16. I normally buy insert holders from Cutwel. I have one size 16 external holder and size 11 and 16 internal holders. When screwcutting small (less than ~12mm) internal threads I use form tools.

Andrew

Just for clarity, any size of holder will be compatible with Metric, UNC or Whit inserts of the matching size (and handedness).

I initially read your post and went off foaming at the mouth: "That's not right, 55°! 60°! Thread Forms!, Someone is wrong on the internet! Arrrrrrgh!"...

Then stopped re-read and went "Oh actually i just interpreted that as saying something different to how it was intended, false alarm!"

.

FWIW I also find Cutwel good for insert holders, although have found APT (Associated Production Tooling) to be slightly cheaper and just as good on service.

Cutwel do stock smaller sizes of full form inserts through, APT only really carry ER/NR16 and up, which is fine for external threading, but a pain if you want inserts for internal threading of small bores.

[Anonymous]

Posted by Jelly on 13/09/2022 12:44:14:

…read your post and went off foaming at the mouth…

Languages are not a strong point, so I try to choose my words carefully so that they represent the picture I have in my head. I know that I have a tendency to be economical with words. When I was playing at being an academic I often got research papers back with a request to expand on the introduction before publication.

I read, and re-read, a post to make sure I understand it before posting a response. I also like to read the whole thread to make sure I am not simply repeating what has already been said, or asking a question that has already been answered. Of course that sometimes means that I am pre-empted by another poster, in which case I don't post.

Andrew

[old martParticipant @oldmart]

I have the laydown inserts in 11,16 and 22 sizes. There are limits of the thread pitches with each size and the minimum hole size they will fit in. It is possible to make custom holders for a specific job if the standard tooling ends up being slightly too big if you also have a mill to make them. Here is one that I made with a coarse ACME form to manage a tight fit.

[DalboyParticipant @dalboy]

Thank you guys. Learned something else where is the best place either a book or on the web to find information on the different sized inserts for thread cutting.

[BazParticipant @baz89810]

Try an online catalogue, Stellram or Sandvik or perhaps APT tools.

[DC31kParticipant @dc31k]

If you search for 'Seco threading guide', the pdf they give you is very good as it includes number of passes and infeed for each pass.

Every major insert manufacturer produces a similar guide, so pick any of them (Seco, Sandvik, Iscar. Pozithread).

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