AdrianH
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| posted on 11/8/10 at 07:46 PM |
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Help on lathe tooling, O ring grooving?
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]
Why do I have to make the tools to finish the job? More time then money.
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madteg
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| posted on 11/8/10 at 08:45 PM |
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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.
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AdrianH
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| posted on 11/8/10 at 08:53 PM |
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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
Why do I have to make the tools to finish the job? More time then money.
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RAYLEE29
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| posted on 11/8/10 at 08:56 PM |
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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
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RAYLEE29
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| posted on 11/8/10 at 09:00 PM |
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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
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02GF74
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| posted on 12/8/10 at 11:04 AM |
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could you make a tool out of a piece of hacksaw blade, ground to shape?
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Alan B
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| posted on 13/8/10 at 03:12 PM |
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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]
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