Re: [CAD_CAM_EDM_DRO] Re: Newbie - Help & Clarifications

Fred Smith wrote:

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "David A. Frantz"
><spinwizard@f...> wrote:
>
>
>>I have to agree with Dave here. You risk damage to both the
>>
>>
>machine
>
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>>and yourself by disabling or removing these switches. the risks
>>involve more than human error. But like the poster below I've
>>
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>seen my
>
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>>share of people permanently injured because they thought that a
>>
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>human
>
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>>error was beyond them.
>>
>>
>
>In the not so distant past, many machining centers and turning
>centers were shipped fully enclosed, and with door interlocks that
>prevented access to tool, part, and/or fixtures. There was little
>if any provision for view ports into the enclosed machine workspace.
>
>

As far as I know they still come this way.

>That is they could only be used with preset tools as there was no
>method provided for a setup person to use simple tool touch
>techniques to set tool length and work offsets. No accomodations
>were provided to use edge finders for example, to set part zeros.
>
>

That is an issue and accomodations can be made for zeroing out tools.
In any event those tools are enclosed for a number off reasons.

>Few production or tool shops left the interlocks in place as it was
>impossible to use the machines for any but strictly dedicated
>production jobs.
>
>

That is the excuse that I hear from a number of people. Usually the
same people that have war stories about getting injured on the job.

>These machines were a combinaiton of paranoid safety reactions and
>lousy/inadequate controller design. The legal environment left few
>options available to US machine builders. This was a major cause of
>the failure of the US machine tool industry between 1980 and 1995.
>
>

Fred; I find your post in these forums interesting to read but I believe
you went of the deep end here. The safety devices where put in place
due to real accidents that often maimed the person being injured. As
to controller design, there is a limit to what a controller can protect
against especially when people make it a point to bypass simple safety
devices.

>The Japenese were exempted ( an profited greatly) because you can
>only get a few drops of blood out of a distribution network sourced
>from another country.
>
>

All importers have to conform to the same safety regulations as the
domestic manufactures. In any event this makes no sense due to the
very stringent regulations in europe. Often European machines come
in to the country with far more tought put into safety than the domestic
brands of that era. Today though due to the international nature of
the machine tool industry even doemstic manufactures have adopted ISO
for benchmarking safety design of their equipment.

>Fred Smith - IMService
>http://www.cadcamcadcam.com/hobby
>
>

The reality is that many machine tool manufactures simply could not
compete price wise or would not put the engineering into the machinery
to be competitive. Thankfully some manufactures have adapted and at
least try to compete either via pricing or via technology. I simply
can not see safety of equipment as being a cause for the issues the
American machine tool industry suffered through.

>
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