Through coolant lathe boring tools

I've got a couple of these (Glanze) which I bought just because I wanted boring tools, I didn't give any thought to the through coolant thing. Now I have a project which will involve a lot of (boring) boring in MS so I want push them as hard as I can. But how to connect to the suds pump? The entry hole at the back of the tool seems to be a plain 4mm bore, which I guess I could drill out to to take an m5 thread and make an adaptor, but I'm wondering if there's some 'industry standard' method which wouldn't involve me reinventing wheels?

Rob.

Presumably talking lathe here, not mill! I don't know about industry standard, but would a press-fitted nipple not suffice?

Hi Robin,

I have one of the Glanze through coolant boring bars. I connected mine to the suds pump by finding a piece of brass tubing (the sort you can get from model shops from K & S) that was a tight push fit in the bore. I pushed the tube in with some loctite on it just to hold it in position. I then made a cross over from 1/4" N.P.T. to a plain tube end that fits into the coolant hose supply base. To connect the coolant I simply push on a piece of clear plastic pipe onto the plain tube ends on the base and the tool.

Thread in or friction fit or bond an adaptor in with a spigot to accept 4mm or 5mm bore silicon hose, coolant nozzle will push straight in and pull out after use.

Even with a small hole through adaptor plenty of coolant is fed through often find myself running coolant at less than normal for external turning.

Ta, was hoping there an off-the-shelf adaptor so I wouldn't have to take the part I was working on out of the chuck, but it seems not, so I just threaded the hole in the tool and turned a screw-in spigot. It works a treat - I was surprised by how much better the tool performed compared with trying to point the coolant spout into the bore.Not so much to do with cooling as keeping the cutting edge clear of chips I suppose.

Robin.

Tools with through coolant are used on production CNC machines. The machines themselves have spindle through coolant or tool post through coolant which passes directly through the tool. In many cases this coolant is high pressure and highly filtered, not something to use on an open machine.

Howard