Single point thread tools

[Lloyd Barnes]

Could do with some advice on single point threading in a CNC mill.
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Is there a good place to buy tools in the Uk?
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I have a range of sizes of thread I'll need to cut. One for example is approx 80mm diameter internal thread, others down to 30-40mm. Will I need different sized tools to get the right thread form in the base of the cut etc?

[Robin Hewitt]

It used to me hugely expensive to buy gear cutters until some bod started selling full sets of Chinese tooling on Bay of Fleas.

The thread cutters look so flimsy I would be wary of practicing with an expensive one unless I had a lot of iron and huge floods of coolant to back it up

But are the Chinese parts bringing the price down yet? I don't know

[m_c]

A few, but they won't be cheap. How much are you willing to spend?

To get a thread with a correct thread form, you'll need a different tool for each pitch, however unless you really need to meet the official spec, then you can get away with only one or two tools.

[mekanik]

You will also need some way to gauge your finished thread to ensure it complies with the recognized standard.
Regards
Mike

[Lloyd Barnes]

The ones I've seen in the US seem to be around £100. Pretty pricey but if I only need one then I guess I can live with it. If I need several its another matter clearly and I'll need to rethink.

I'd prefer an indexable one so I could replace tips rather than the whole thing!

[magicniner]

For that size range you can use an ISCAR MGCH 06 or MGCH 08 with a thread cutting insert, the inserts are available in the two most common thread angles.
Tony at Jurassic Tools has a few in stock at an excellent price - http://www.jurassictools.com/store/s...re&phrase=mgch
My only connection with Jurassic tools is as a very satisfied customer,

- Nick

[magicniner]

The thread cutters look so flimsy I would be wary of practicing with an expensive one unless I had a lot of iron and huge floods of coolant to back it up

Robin,
It's not in the least bit scary, I've never broken a cutter and I've cut internal threads down to M3.
Provided you run at the recommended rpm you are fine, air + mist lube is sufficient to clear chips and lube the tool and the lovely part is that if you need to or if you are prototyping you can take multiple passes until you get where you need to be ;-)
Regards,
Nick