Internal Threading

[Paul ScholeyParticipant @paulscholey17560]

I want to buy a new internal threading cutter as the HSS one I thought was ok must be very poor quality as its gone blunt and done nothing.

Which should I buy HSS, Brazed Tipped or Indexable? If I go for Tipped or Indexable can you take a very fine cut like you can with HSS?

Thanks Paul.

Edited By Paul Scholey on 25/05/2011 16:46:58

[Paul ScholeyParticipant @paulscholey17560]

[Les Jones 1Participant @lesjones1]

Hi Paul,

What material are you trying to cut the thread in. Also did you have any problems with the rest of the machining using HSS.

Les.

[Paul ScholeyParticipant @paulscholey17560]

Just mild steel Les, not had any problems machining the rest. I have done very little internal threading up to now, I was just wondering what type of cutters most people are using now? What are the advantages or disadvantages of the different types.

Edited By Paul Scholey on 25/05/2011 20:57:03

[Les Jones 1Participant @lesjones1]

Hi Paul,

I think the tool you were using must be poor quality HSS or it was not ground correctly and was rubbing. If the hole you are threading is a small diameter it is quite difficult to get the tool shape correct. I would stick with HSS but others may recommend an indexable tool. It is a matter of personal preference.

Les.

[JonParticipant @jon]

If a small non robust lathe or a limited use grind yourself from decent quality an HSS 5-8% cobalt tool steel up with the full profile.

More rigid machines the indexable ones work very well as long as the tool is robust. ie the cheaper ones from asia dont bother even at over £62, they flex and total waste of money i have a few plus one from an advertiser on here German sounding which is like butter another £30 odd wasted.

Go without and save up for one good one from decent brands as Kennametal, Ceratizit, Seco, Sandvic, and the like.

 

If centre heights right, rigid and still sharp you can take as little off as you can. Cant do that with flexable tooling, it deflects without cutting.

[John Stevenson 1Participant @johnstevenson1]

I bought one of these last time I was Stateside but they do ship worldwide.

 

Depending on which way you install the insert one tool does RH threading, LH threading and internal

 

Mesa Tools

 

Inserts are quite reasonable pried as well.

 

John S.

 

 

[adyParticipant @ady]

Make a small boring bar and practice threading with it, grinding your own hss tips.

 

Once you get any good at it then you can use the off-the-shelf stuff.

 

And buy 

 

http://www.bookdepository.co.uk/Screw-cutting-Lathe-Martin-Cleeve/9780852428382

 

from wherever.

 

This author left us an amazing book on the subject.

 

His own Myford lathe was modded to be like a mini herbert production machine.

He made a nice living from working no more than 12 hours a week.

Edited By ady on 26/05/2011 00:17:09

[Paul ScholeyParticipant @paulscholey17560]

Thanks for all information, very helpful.

Paul.

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