ive got a tracking force gauge that reads nm's

whats an nm?
and how many of them are in a gram?

thanks,

Rob.

 

nm = newton meter - a measuement of force.
gram = measurement of weight.

 

just donr a google ,
1.5 gramm = 15 mn.

 

Well, that's if you are gonna take gravity to be 10m/s^2 rather than 9.8


The Moog

 

Andy, Nm (newton metres) is a unit of torque, not force. mN (millinewtons) on the other hand is are a unit of force, which is probably what rob meant.

Grams are units of mass, not force so you cannot directly convert grams to millinewtons. Whichever site said that 1.5grams = 15millinewtons is making the (common) mistake of assuming that grams are a unit of force.

Force = mass x acceleration . The acceleration of gravity is (roughly) 9.8m/s² so the force of gravity on 1.5grams = 1.5 * 9.8 = 14.7mN (millinewtons not Newtons because were talking about grams, not kilograms).

So, what you (rob) wanted to know is that the gravitational force exerted on 1.5g = 14.7mN. A guage that reads in mN is actually the correct way to do it.

Michael.

 

setting up a turn table is a lot more interesting than i thought it might be eh?
the tracking force on my cart is 1.5g / 15 mN , had to go to the manufacturers web site for that one.
another thing i found out , trying to aligne an orfoton omb 10 is a nightmare on an alignment protractor.thers not a straight line on the damn thing to use as a referance point.

http://www.ortofon.com/html/body_magnetic_technical_data.asp?varenr=0131131

 

Micheal, torque is an applied force.
Newton is an Si unit of force.

 

Yes, torque is an applied force, but it's not strictly speaking a pure unit of force, but we're splitting hairs. 1Nm is the torque resulting from a force of 1N being applied at 90deg to the end of a lever that's 1m long.

Michael.

 

Hi,

Mass is the amount of matter in an object. Measured in Kilograms (Kg)

Weight is the force of gravity acting on an object. Measured in Newton (N)

Weight = Mass x Gravity. On this plant the gravity = 9.81m/s². It is very often rounded up to 10m/s² in text books. This makes it easier to do calculations.

The mass of an object will stay the same but the weight will vary depending on the gravity. For example, a lump of lead 10kgs will be 10Kgs on earth & 10kg on the moon. The weight will be 98.1N on Earth & approx 16.35N on the Moon. The Moon gravity is approx a 1/6 of that on Earth.

Torque is the turning effect of force and is measured in Newton x metres. (Nm).

mN is a unit of force. This is a 1/1000 of a Newton.

Some tracking force gauges have scales in mN. Ortofon balances are marked in this way. It is common to equate 1 gram to 10mN.

It should be 1 gram = 0.00981N or 9.81mN.

Set your cartridge to the recommendation. For example if it says 2 grams set to 20mN. The adjust by ear and try lower readings or even higher readings. If you have a test record, this will help.


SCIDB

 

Micheal, I think we are meaning the same thing.

 

And if your tracking force gauge really does read in nm, then it's probably a slightly finer-grained instrument than you need for the task at hand. And while we're having an anality competition, 9.8 N / kg is enough decimal places for the strength of gravity on Earth unless you're going to specify your altitude above sea level too.

 

:ffrc:

Michael.

 

No wonder WM doesn't do vinyl - it simply wouldn't work where he comes from.

So an important lesson here. Leave the vinyl behind as you board the shuttle - another amazing claim courtesy of Zerogain!

 

Brilliant :MILD:

 

They don't let you take sharp objects on board anyway.

 

And to think, they say people on forums are geeks. Can't think why...