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Posted by Jim Chandler on May 25, 2008, 1:54 pm
Please log in for more thread options Tim Wescott wrote:
> On Sun, 25 May 2008 02:44:56 +0000, Jim Chandler wrote:
>
>
>>Karl Townsend wrote:
>>
>>>Most likely, you're dealing with part deflection. It bends away from
>>>the cutter, making it larger the further from the chuck,
>>>
>>>Very finely sharpenned and honed tooling helps a lot with this issue.
>>>if you've got it, super high RPM and a light finishing cut help too.
>>>
>>>Karl
>>>
>>>
>>>
>>
>>Thanks, Karl. I'll give that a try. I hadn't thought about deflection
>>because I thought everything was solid.
>>
>>Jim
>
>
> Zero deflection, eh.
>
> It's amazing just how elusive 'zero' can be when you start looking hard
> enough.
>
That's what happens when you're not a real machinist and are judging
things by feel. It is amazing how weak things really are. The first
time I tried turning this thing I had a 3/16" bolt threaded all the way
through it with a nut on the end cinched down tight. I chucked it up
and started turning. About the third pass, I got a little overly
enthusiastic I guess, and took too big of a cut. The bit dug in and the
bolt bent nicely right behind the nut. I was amazed. you don't think
of those things. At least I don't.
Jim
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> cutter, making it larger the further from the chuck,
>
> Very finely sharpenned and honed tooling helps a lot with this issue. if
> you've got it, super high RPM and a light finishing cut help too.
>
> Karl
>
>