Brian,
A bit off the immediate topic, but don't forget to notify the customer of
the floor loading requirements.
Not only the total loading but also the point loading that each of the
casters will impart.
Oscar Overton
Product Safety
"Scott B. Lacey"
<sblacey@verizon.
net> To
Sent by: "Kunde, Brian"
[email protected] <[email protected]>
cc
[email protected]
07/23/2008 09:09 Subject
AM Re: caster safety
Please respond to
[email protected]
et
Brian,
In such cases your best bet is usually to ask
these questions of the caster manufacturer
re. impulse loads, etc. I would remind you that
items such as portable hoist gantries use
casters under much more difficult conditions
than yours. An experience caster
manufacturer should be able to provide you
with the answers.
Just a reminder, at 900 lbs the instrument
should have at least two of the casters
provided with brakes.
Scott B. Lacey
On 22 Jul 2008 at 16:48, Kunde, Brian wrote:
>
> I´m trying to specify casters (wheels) for a 900 lb instrument (408kg).
The EN61010-1 safety
> standard doesn´t really cover this safety aspect. In our case, if one of
the casters breaks the
> machine could tip over and cause injury.
>
> Currently our mechanical people are looking at four casters rated 296 lbs
each. I know if you roll
> the machine on an uneven floor all the weight can momentarily be on two
or three casters which
> would exceed the weight limit. Is there a margin built into the caster
rating to account for this
> situation? Is there a formula to use for calculating the distributed
weight across the
> casters/wheels?
>
> It would seem logical to me that the wheels would not have to be rated
any higher than ½ the total
> weight. Is there a standard for this?
>
> The only thing in the standard that I can find that is close is for
handles which have to be rated 4
> times the weight of the equipment. That would seem to be very over-kill
in this case.
>
> Thanks to all for your help.
>
> The Other Brian.
>
>
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