Any ideas what these are?

These were in a box of stuff I got at a car boot sale yesterday.

They are marked Deloro Stellite and then an imperial size.

Thanks.

[img]http://s10.postimg.org/ebprw0lg9/image.jpg[/img]

[img]http://s10.postimg.org/s446rnc7t/image.jpg[/img]

Edited By Chris Denton on 02/06/2015 09:40:58

First link

Second link

I suspect they are stellite drills. They can be used to drill hardened material and are said to work best when they get red hot. I've never used one hence said but it makes sense. I did see some stellite tool bits some time ago. Rather expensive.

John

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Reamers perhaps?

Buck and Hickman sell them

**LINK**

John

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They are stellite drills used for drilling hardened steel even HSS steel.These drills are used in a drilling machine at a high speed and with considerable pressure and they rely on friction causing the job to get red hot locally so the drill can penetrate. I believe that stellite doesn't exist in a soft state so the heat has little effect on it Before tungsten carbide became available it was the most practicable way to get through a case hardened part to prepare the way for a drill. Now obsolete with modern tools. Colin

I'm not so sure about them being obsolete. There are variations on the same theme such as this one

**LINK**

I understand this one can only be ground with diamond. Its' fairly easy to buy Stellite tool bits and drills so I'd guess it still has it's applications. Trouble is that even a 5/16 tool bit works out expensive. I have no idea how expensive the tantung stuff is.

John

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You don't need diamond to grind stellite.

Rik

If anyone has some toolbits and wants to grind them on a surface grinder, they better remember they are non-magnetic. Almost found out the hard way.

I came across an amateur web site some time ago run by a person who loved stellite lathe tools. It was at the tail end of times when cheaper used machine tool and junk dealers had bins of used tool bits. He used to search through them with a magnet. The site was all good advice elsewhere so I have always had a hankering to try some. £27 for a 5/16 tool bit is a bit off putting though.

The comment about Tantung G and diamonds is just a comment off the web. True / False pass.

John

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Edited By John W1 on 02/06/2015 15:02:14

Didn't Stellite used to be used to hard face valves in old sports car engines?

Russell.

Yus. You are quite right, sodium filled valves too.

graham.

I don't think there is any advantage at all in using Stellite for lathe tools as HSS is more than adequate for most work and carbide is best for cast iron. I use silver steel for small boring bars. Colin

Thanks for that.

Interesting.

I may try them!

Eccentric Engineering the makers of the diamond tool holders seem to think that class of material has its merits in model engineering as they have just started selling a similar material. see link below

**LINK**

Steve

Used them and it can be quite entertaining, don't have anything flammable near by if you do use them.

I also used to use Stellite to face steel shoes for speedway and grasstrack, goes on nicely once you get the knack.

Steve