Re: [CAD_CAM_EDM_DRO] Newbie - Help & Clarifications

----- Original Message -----
From: "Blue" <jo001k1132@...>
Subject: Re: [CAD_CAM_EDM_DRO] Newbie - Help & Clarifications


> And I must reply while hoping it doesn't result in a slanging match.
>
> What I wrote was my opinion and was meant to show there is another way
> used
> to establish a datum start point/home position other than having
> limit/home
> switches. I made the comments taking into account that it is unlightly the
> post was coming from someone who was intending to CNC a 20 hp machine. I
> should have made it clear that table-top machines, used in the home shop
> by
> competent machists, do not need the safety features found on industrial
> machines where the users have got to be treated like morons because of
> their
> propensity to do something stupid and sue.
>
> In all my years, and it is considerable, of using and repairing machine
> tools I have never seem or heard of a CNC machine running away because it
> is
> faulty, they stop. I have seen and repaired the results of bad programming
> but never on a machine which had an on-screen display of what the program
> is
> going to machine. I have never and would not remove safety switches from a
> machine that was being used in industry or by other people.
>
> I have an 11" swing lathe and the only thing that happened, on the one
> occasion I did run the tool into the chuck, was a loud bang and a bent
> boring bar. Just as would have happened had it been a manual machine
> without
> all the switches. Since this incident I do not allow others into my home
> shop while I am machining.
>
> Regards,
>
> Terry
>
>
>
> | Sorry, but I have to jump in on this one.
> |
> | You may consider you have the intelligence to avoid this but,
> | we all at times make mistakes.
> |
> | It is also known that now and again a CNC machine can run away
> | through a fault or a programming error.
> |
> | On the financial side you will have removed any form of compensation
> | if anything does go wrong.
> |
> | I have seen more industrial injuries and deaths than I care to remember
> | because someone decided to disable a safety device as it was
> inconvenient.
> |
> | To suggest this to someone who has declared themselves as a newbie is
> the
> | height of irresponsibility.
> |
> | Dave M
> |
> |
>
> |
> |
> | > Hi,
> |
> | ---snipped---
> | >
> | > I do all my programming from this point and have no use for limit or
> | > homing
> | > switches. In fact my lathe came with all the health and safety
> switches
> | > required to make it almost idiot proof but I found them so annoying
> they
> | > have all be removed or wired out. I have enough intelligence to know I
> | > can't
> | > moved a slide into the chuck without some serious bit of flying metal.
> | >
> | > The only time limit switches come into their own is when jogging the
> | > slides
> | > outside of program control and holding a conversation at the same
> time.
> | > Something I avoid.
> | >
> | > Regards,
> | >
> | > Terry
> | >
> | >
> | > | I'm new to CNC
> | > |
> | > | I understand that the tool has to be homed to get a physical
> | > | reference to the m/c in relation to which the tool will be moved.
> | > |
> | > | Is this done with a switch to which the tool has to be moved, and
> | > | the when the switch closes, the tool is stopped & the position
> | > | becomes the home position ?
> | > |
> | > | If the above is true , then what is the accuracy / repeat accuracy
> | > | possible with home switches ? Are there any special switches
> | > | available for this purpose ?
> | > |
> | > | Is there any other method for homing ?
> | > |
> | > | Are there any sites / books where I can get my basics of CNC -- like
> | > | the question above ?
> | > |
> | > | Any help from all you so knowledgable people is welcome ?
> | > |
> | > | Biswanath
>
>
>
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