Find the force while lapping a specimen

[blueboo33]

Homework Statement

I would like to find the force that acting on my round plate that holds my specimen. which pressed with force 100 N, to push specimen lapping with the lapping wheel at 500rpm. and while lapping the force is acting on the round plate.

Relevant Equations

if I use equation F=uN is that right or I should add anything else please help me

 

[berkeman]

Welcome to the PF.

You show your specimen in the center of the Lapping Wheel. Does it stay there during the lapping process?

Are you using a slurry? What is it made of?

https://en.wikipedia.org/wiki/Lapping

 

[haruspex]

I assume you mean you are trying to find the torque. The rotation rate is not relevant.
Presumably the normal force, F= 100N, is uniformly spread across the whole area A.
Consider a small area element rdrdθ at radius r. The normal force is $\frac 1AFrdrd\theta$, so the tangential frictional force is $\frac 1A\mu Frdrd\theta$.
To get the torque this exerts around the rotation axis, we multiply by r: $\frac 1A\mu Fr^2drd\theta$.
To get the total torque integrate this over the area of contact.

 

[blueboo33]

Welcome to the PF.

You show your specimen in the center of the Lapping Wheel. Does it stay there during the lapping process?

Are you using a slurry? What is it made of?

https://en.wikipedia.org/wiki/Lapping

View attachment 253314

Thank you for replying to me.
No, it's the metallographic grinding.
the specimen held against the disk wheel.
the specimen made from resin.

(https://www.kemet.co.uk/blog/metallography/metallographic-polishing-and-grinding)
but I will use the holder to hold instead hands I just wonder the force that acting on the holder.
and its the bearing force right.

(https://www.metallographic.com/Metallographic-Equipment/Metallography-Single-vs-Central-Force.html)

 

[blueboo33]

I assume you mean you are trying to find the torque. The rotation rate is not relevant.
Presumably the normal force, F= 100N, is uniformly spread across the whole area A.
Consider a small area element rdrdθ at radius r. The normal force is $\frac 1AFrdrd\theta$, so the tangential frictional force is $\frac 1A\mu Frdrd\theta$.
To get the torque this exerts around the rotation axis, we multiply by r: $\frac 1A\mu Fr^2drd\theta$.
To get the total torque integrate this over the area of contact.

thank you for replying to me

 

[blueboo33]

thank you for replying to me

If I don't want to find the torque. the specimen, not spin. what should I do

 

[haruspex]

If I don't want to find the torque. the specimen, not spin. what should I do

I don’t understand. If not the torque, what?