[rwexec]

Took on a job the other day that several shops had turned away.
It was a high pressure pump body with a .625 bore with a depth of 2.8"
The bore finish needed to be a 16um.
The material was 1018 steel.

I used a Kennametal Tenthset boring head and a 3/8" valenite boring bar to do
the boring.
After tweaking on a scrap bit I achieved a pretty good finish so I got on with
the job.
I made five parts and they only wanted four so I milled a quarter section away
so I could see how the bore finish was right out of the Tormach.
We measured it at 24um.

I did have to hone the parts a bit to get the required finish but I was truely
amazed once more at the capabilities of this little machine.
I believe had I had balanced tooling I could have achieved the finish on the
mill.

So whats the next challenge?

Regards
Peter

[neutronics]

Thanks for posting. If you don't mind - what was your boring setup?

[rwexec]

I used a Kennametal Tenthset boring head and a 3/8" Valenite bar.
:cheers:

[Tormachmaster]

Took on a job the other day that several shops had turned away.
It was a high pressure pump body with a .625 bore with a depth of 2.8"
The bore finish needed to be a 16um.
The material was 1018 steel.

I used a Kennametal Tenthset boring head and a 3/8" valenite boring bar to do
the boring.
After tweaking on a scrap bit I achieved a pretty good finish so I got on with
the job.
I made five parts and they only wanted four so I milled a quarter section away
so I could see how the bore finish was right out of the Tormach.
We measured it at 24um.

I did have to hone the parts a bit to get the required finish but I was truely
amazed once more at the capabilities of this little machine.
I believe had I had balanced tooling I could have achieved the finish on the
mill.

So whats the next challenge?

Regards
Peter

A finish like that it is not a big deal to need to hone it thats pretty normal. a different tool would possibly get it for you. we do some 12 finishes with a custom made boring bar but it is very expensive.

[rwexec]

we do some 12 finishes

That's a strange finish requirement a 12 not at all common:stickpoke

I am sure had I invested the money in expensive tooling I may well have achieved the what I was looking for but who wants to pay more for tooling than the machine cost itself
An even less costly solution would be to use a different material such as Leadloy.
The object is to get the part complete in one set-up without secondary operations, Done In One.
When I get my fourth axis fired up I will be able to do jobs like this in just that manner.

[MBG]

Did you thread mill the threads? just curious.

[Tormachmaster]

[QUOTE=rwexec;847508]That's a strange finish requirement a 12 not at all common:stickpoke

Implants

[rwexec]

Yes, I milled the threads.

What kind of an implant needs to be honed?