I have a possible job to turn an O ring grove in some 12.9 Bolts. The groove is only 1.5 mm diameter and therefore only 0.75 mm deep, but I do not possess a suitable tooling holder and set of inserts.

At present I only possess standard holders such as TAPR, T-Max, PCLNR holders and a parting off blade system that takes PTNT inserts.

Can anyone suggest a insert/holder that would do?

I do not trust myself trying to grind up a piece of HSS and would wonder how long it would last against the 12.9 bolts.

I had an estimate from a supplier of Sandvik who said £60 plus for tool holder and £20 plus per insert for what I think was called Corocut 3. Inserts only come in pacts of 10!!!

So unless I can think of another way, the job may just have to be passed over.

Worth an ask.

Adrian

[Edited on 11-8-10 by AdrianH]

Can you turn slowly in lathe and hold a grinder on bolt with a 1.5 cutting wheel in it, i know it sounds crude but it works i put a cir clip groove in my drive shafts like this.

Hi madteg;

I would have approx 1,000 parts to do so need better control, I did think of similar with a tool post grinder, but dressing the wheels to keep profile put me off.

Cheers

Adrian

Hi,use an old parting tool tip and carefully grind to 1.5 width and then carefully grind on the rad.
try on a piece of scrap first or spare bolt
12.9 bolt shouldnt be too hard so you could also try with an hss parting tool or small hss tool bit
Ray

just seen the amount you want to do
so do yourself a favour get a wimet brazed on carbide parting tool grind that up
for a thousand youll have to touch it up a fair few times
Ray

could you make a tool out of a piece of hacksaw blade, ground to shape?

For that quantity get the right width carbide tool and holder. I know you can get them for circlip grooves so worse case just modify one of those.

Forgot to say, don't forget that O-ring grooves are rectangular (sometimes with tapered sides even) in section with tiny rads in the bottom and outer edges...just in case you were planning a half round section groove...


Alan

[Edited on 13/8/10 by Alan B]

[Edited on 13/8/10 by Alan B]