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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