The best method I've seen of protecting press equipment is to wire the
equipment so that the operator has to press two buttons simultaneously
to operate the equipment and that the buttons are far enough apart that
both hands are required. Of course this is in addition to rather than
instead of the usual guards etc. A really determined idiot will always
find a way to bypass safety guards but this way seemed elegant and
effective.
Regards,
"" wrote:
>
> Solutions may be more elegant these days, but a mechanical guard screen
> coupled to an interlock used to be the method of preventing squashed
> operators. In position, the screen prevented the operator getting access to
> the moving parts of the machine while it was operating, and with the screen
> raised, the interlock prevented the machine from operating by activating a
> cut-out. Not fool-proof, as ingenious operators on piece-work would bypass
> the interlock to keep the machine functioning with the screen raised to
> increase throughput rather than spending time raising and lowering a screen
> for each piece of work. Bear in mind that "bolt-on" safety mechanisms are
> never as good as mechanisms that are designed in with the machine to start
> with.
>
> Special fixtures will be required anyway, but if you use them without a
> guard screen of some kind as well, the operator can still get access while
> the machine is capable of being operated. The risk of injury is reduced but
> still present. I'm not up on current safety methods in this situation, so
> can't advise alternatives, but a light curtain that comes on when the start
> button is pressed sounds like a neat way of achieving the desired result.
> At least if it gets too dirty or fails, the machine will be inoperable,
> which is erring on the side of safety.
>
> Peter Duncan
>
> Peter Lee
> <ppwlee@YAHOO To: [log in to unmask]
> .COM> cc: (bcc: DUNCAN Peter/Asst Prin Engr/ST
> Sent by: Aero/ST Group)
> TechNet Subject: Re: [TN] Manual Press for PEM PCB
> <[log in to unmask] fastener
> ORG>
>
> 11/21/01
> 03:51 PM
> Please
> respond to
> "TechNet
> E-Mail
> Forum."
>
> My application requires operator to support and locate the board
> assembly with one hand while activating the start button on the press to
> install the PEM fasteners.
>
> For safety reason I am considering limiting operator access while the
> machine is in operation.
>
> What is the normal practice? Installing a light curtain sensor around
> the area? Or multi-purpose fixtures that will secure the board to ensure
> a "hands free" operation?
>
> Any input is greatly appreciated.
>
> Rgd,
> Peter
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeff Ferry
> Sent: November 14, 2001 6:16 AM
> To: [log in to unmask]
> Subject: Re: [TN] Manual Press for PEM PCB fastener
>
> Peter,
>
> Might suggest you look over Janesville Tool at
> http://www.janesvilletool.com/.
> We use their presses for setting eyelets.
>
> Jeff Ferry
> CEO
> Circuit Technology Center, Inc.
> www.circuittechctr.com
> [log in to unmask]
> 978-374-5000
>
> Sign up for our Free E-mail Newsletter at:
> www.circuittechctr.com/general/free_email.htm
>
> -----Original Message-----
> From: Peter Lee [mailto:[log in to unmask]]
> Sent: Wednesday, November 14, 2001 2:46 AM
> To: [log in to unmask]
> Subject: [TN] Manual Press for PEM PCB fastener
>
> Thanks Earl for your extensive report on NPI which will keep me tied up
> for a while in reading through it. I appreciate you for sharing your
> experience and information in this forum.
>
> I have another question for the day: Does anyone know of a good and
> reliable machine for press-in PEM PCB fasteners?
>
> I am considering machines from PENN ENGINEERING and SCHMIDT but like to
> get more inputs on both the press machine and the process. Would a
> manual press be able to put out ~2200 lbs at the fastener in practice?
> What are some common application problems that one should look out for?
>
> Rgds,
> Peter
>
> _________________________________________________________
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--
Eric Christison
Mechanical Engineer
STMicroelectronics
33 Pinkhill
Edinburgh
EH12 7BF
Tel: (0)131 336 6165
Fax: (0)131 336 6001
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