From: Greg Pettengill (gpetteng@bellsouth.net)
Date: Tue Dec 24 2002 - 05:37:37 EET
or perhaps an ad for Viagra? :-)
Happy Holidays
Greg Pettengill
----- Original Message -----
From: <admin@michaelrees.com>
To: <jean-marc.boechat@mimsystems.com>; <rcosta@agiltec.pt>;
<rp-ml@rapid.lpt.fi>
Sent: Monday, December 23, 2002 7:13 PM
Subject: Re: hardness convertion
wow, lucky thing I decided to check these emails. For a moment I thought
someone was spamming my email with porn promos...
michaelrees
Original Message:
-----------------
From: Jean-Marc Boéchat jean-marc.boechat@mimsystems.com
Date: Mon, 23 Dec 2002 17:46:17 +0100
To: rcosta@agiltec.pt, rp-ml@rapid.lpt.fi
Subject: Re: hardness convertion
Hi!
There's no way you will be able to convert Rockwell C into Shore D or A or
backwards. The three scales are basically based on the
same principle: A penetrator is forced in the material with a given load
for a certain time and the systems measures the depth of
the penetration. However the comparison ends right there.
For Rockwell C (HRC) the penetrator is a diamond cone with a tip radius of
.2 mm and an angle of 120° the load is 1471 N.
For Shore A the penetrator is a steel pin with a conical flat tip and an
angle of 35°, the load is 9.8 N whereas the Shore D has
a pointed steel pin with a 30° angle cone, a 0.1 mm tip radius and a load
of about 49 N.
To be practical, let say that HRC is fit for hard materials like quenched
and high yield steels, Shore A is used for rubber like
materials and soft polymers and Shore D is used for the more "technical"
polymers.
It is the old oranges and apples story once again.
Have a nice and safe Holliday Season
J.-M. Boéchat
Rui Costa wrote:
> Hello list!
>
> Does anyone know where can I find a way to convert the Rocwell C hardness
scale in to the Shore D and shore A hardness scale?
>
> Thank you in advanced and merry Christmas to all.
>
> With my regards,
> Rui Costa
-- Jean-Marc Boéchat email: jean-marc.boechat@mimsystems.com MIM Systems Ltd phone:+4126 430 08 08 fax: +4126 430 08 09 Swiss Branch office website: www.mimsystems.com P.O. Box CH- 1723 Marly 2 Switzerland "when things go wrong, don't go with them!"Disclaimer: "I speak for myself only, it's hard enough!"
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