News22 QC Testing of Scooter disc brake pads

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News22 QC Testing of Scooter disc brake pads

Postby Krauss » Thu 27. Jun 2013, 13:36

Reccomended practice

The paper gives a recommendation on how to test scooter front disc brake pads in QC
on a Krauss friction tester. As an example we used a brake of a Yamaha Type Cygnus X 125 FI.

The procedure is based upon the PV disc brake test but applied a testing time of 3,0 sec,
instead of 5,0 sec for cars. The testing torques have been selected based upon
experience gained in the past.

It will create this kind of graph including the friction characterstics µ shown.

Duration of the test is approx. 40 - 45 min.

Download Paper

Image
Best regards - Peter Krauss

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Krauss
Posts: 396
Joined: Fri 30. Mar 2012, 15:32
Location: Murr / Germany
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News22-QC Testing of Scooter disc brake pads

Postby Krauss » Tue 2. Jul 2013, 16:49

Paper updates

02.07.13 Computing rm added Page 3
05.07.13 Photo test set up added Page 4
Best regards - Peter Krauss

User avatar
Krauss
Posts: 396
Joined: Fri 30. Mar 2012, 15:32
Location: Murr / Germany
Contact:

News22-QC Testing of Scooter disc brake pads

Postby Krauss » Fri 5. Jul 2013, 20:46

Question:


Juan Antonio Cuadrado / Jjuan

Dear Peter,

Sorry for not having been able to support you on that study. I had
many trips worldwide in a row so I have spent long time out of the office.

Your paper is very interesting. About the temperature profiles they look OK.

I have one question. When you sa y: “Prior to testing the rotor shall
conditionned (infected) with the material to be tested. The infected
rotors can be used until the thickness has reached ist wear limit of
min. 1,8 mm as specified for this type of disc. Then it must be
replaced”, I understand that conditioning is made with the ‘Bedding
profile’, I am right?

In addition, 1.8mm thickness minimum looks too much… our specification is 3.0mm min.

Regards,

Juan Antonio


Answer :

Hello Juan Antonio,

THX for your feedback. Well, the infection of a new rotor with friction material
is NOT the bedding / burnish for getting 100% contact between disc and pad, but
the "transfer" of the material from the pads into the rotor surface. This takes at least
one entire test run. In other (passenger car applications), where the rotors are covered
with corrosion protection material it even needs two entire test runs to take away
the coating and to establish constant friction behaviour. Only like this you will
get a reliable result for the friction coefficient. Also you should not measure
the friction coefficient with a rotor infected with pad material A and then use it
for measuring with pad material B. Only use the same material, which has already
"infected" the rotor. Otherwise you must re-grind it and take off the infected
layer from the rotor ! (Hhhmm - I hope you understand what I mean ...)

The wear of the rotor depends upon the maker and type. We read the "min thickness"
stamped onto the rotor an entered into the paper. So every type of rotor has its own
"min. thickness".
Best regards - Peter Krauss


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