Having trouble turning grooves

Thanks for that information Dave. Being a whipper snapper to some of you guys I am more familiar with metric as I use it daily, so its definitely the most comfortable option for me that allows me to work fastest.

However I tried a small pneumatic project a few months back that opened up a can of worms for me concerning different thread standards and variations. I was trying to source a particular fastener that turned out to be a nightmare and a fair bit of expense through wrong fasteners ordered as a result of my lack of knowledge in the area so I am always happy to learn more concerning threads wherever possible! Thank you.

Ah yes the metric world used "G" threads or BSP to us on pipework.

And to confuse you more the thread size related to the bore not the OD

Probably Indian, not Chinese.

I hope this reply is not too late. Setting up a parting tool correctly is an art. I suggest you take a look at this Youtube video as the guy who produces these is well worth listening to. I have solved many problems using this guys channel.

https://www.youtube.com/watch?v=5LtYzjR1JuM

Great stuff, Thanks. I'll give that a watch. I actually watched his video on knurling before and found helpful. Didn't realise he had other vids on there

Dribbling soluble oil, or even neat cutting oil, onto the cutting edge of the tool sometimes makes life a little better, when parting off (parting tool inverted in rear toolpost, but with no top rake)

Some times chatter can be eliminated by increasing the feed,. Under no circumstances allow the tool to rub.

Howard