Nelson,
Certainly no offense taken.
What I was trying to explain in the article was that a 3 jaw chuck does not have to perfectly center a part in order to turn an OD that is centered within the limits of the machine. It is not about set up, just the fact that most if not all 3 jaw chucks do have run out.
The rest of the article gave an overview of other error sources if the lathe is not set up right.
Since you came away with a different impression, I have to assume that I was not clear. I did mention bearing play but that was just background info after talking about 3 jaw chuck run out. Maybe I confused matters by tacking on that section.
Rick
-----Original Message-----
From: gingery_machines@yahoogroups.com [mailto:gingery_machines@yahoogroups.com] On Behalf Of Nelson Collar
Sent: Saturday, March 05, 2011 8:50 PM
To: gingery_machines@yahoogroups.com
Subject: Re: [gingery_machines] new article: True Enough (Lathe Accuracy)
Rick
I read your article on "True Enough (Lathe Accuracy)". I'm sorry, but what I got was that your chuck and let us not forget the bearings is the cause of inaccurate work. There is no machine that will do perfect work with so effort of the operator and the skill there in. If a person is going to make a shaft, we should not use our three jaw chuck or the four jaw or even the six jaw. I think when a machine is not set up properly for the job to perform, one can't expect the accuracy in the end. And to blame the bearings for the fault of the set-up is wrong. If the bearings are that bad they need to address before looking for precision work. I agree with what you are saying but do not blame the machine for something out of it's control. Also if the work call for the accuracy you are talking about then you would want to have a steady or follow rest. I understand this was written to "newbies", but instead of pointing out the wrong of a machine,
when the machine is acting just like any other machine would work. Maybe we need to point the "newbies" (I hate that word) in the proper set up to avoid the inaccuracy that is normal on any machine under that circumstances. Again that is the reason that a lathe by itself is worthless. If one has the hands on an the proper tooling almost anything can be done. Again a lathe without tooling and the knowledge to operate, it can be dangerous.
I will apologize if I offend you, but hope instead we try to show proper set up to avoid these kinds of problems
Nelson Collar
http://groups.yahoo.com/group/gingery_machines/app/peoplemap/view/map
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