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howto sand shims

Started by SeaLander, February 19, 2010, 12:02:32 PM

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teddy037.2

#15
February 22, 2010, 08:39:32 AM
Quote from: 2001cromo on February 22, 2010, 03:53:48 AM
I'm curious, has anyone noticed any difference in the actual size when measuring a now "hot" freshly sanded shim?

hasn't happened for me

*not with any of the matl we use here, anyway...

aaronb

#16
February 22, 2010, 12:40:27 PM
The coefficient of thermal expansion for steel is 0.00000645in/in/deg F,

the slight temp increase will be negligible with the desired tolerances.  
Milwaukee, WI
'07 s2r1k, '81 honda cb400t

mtuduc

#17
February 26, 2010, 06:45:01 AM
Quote from: aaronb on February 22, 2010, 12:40:27 PM
The coefficient of thermal expansion for steel is 0.00000645in/in/deg F,

the slight temp increase will be negligible with the desired tolerances.  

This is not what I wanted to see a day after my Heat Transfer exam... :-\
95 M900       chop, cored exhaust, apex clip-ons, crg mirrors, race-tech springs, custom paint (repaired dings :))

scott_araujo

#18
February 26, 2010, 07:31:58 AM
Yeah, try writing 'negligible' for an answer on your exam and see how that works out :)

Scott

bigiain

#19
February 26, 2010, 01:15:09 PM
Quote from: Dan on February 19, 2010, 12:55:53 PM
Get a diamond stone.  After you get back to Nate, he'll tell you to use a figure 8 motion to avoid creating an uneven surface, and turn the shim occasionally. 

I do, and advise other people to do this, but I've been thinking about _why_ I think it's the right thing... Best I can work out, it's because that's what my Dad taught me...

I've got no first hand or even second hand experience that shows that figure 8's are neccessary or better than any other sanding/grinding pattern. I can convince myself that the regular turning of the shim is quite likely to be a good idea though.

big (I'm still gonna do it the way Dad told me though...)

ducpainter

#20
February 26, 2010, 01:20:14 PM
Quote from: bigiain on February 26, 2010, 01:15:09 PM
<snip>
big (I'm still gonna do it the way Dad told me though...)
As well you should. [thumbsup]

My dad didn't...and still doesn't know which end of a screwdriver to hold.

It's just the way I learned.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


scott_araujo

#21
February 26, 2010, 02:45:28 PM
I think the figure 8 is a pattern that alternates pressure nicely.  If you just go back and forth or even in circles you tend to put more pressure on the edges forming a very subtle high spot in the center.  With all the change in direction of figure 8 I think it minimizes that. 

But 'dad said so' probably holds as much water as any BS I come up with ;)

Scott

Monsterlover

#22
February 26, 2010, 04:10:49 PM
Am I the only one that uses a die grinder with a sanding disc on it and a set of mics to check?
"The Vincent was like a bullet that went straight; the Ducati is like the magic bullet in Dallas that went sideways and hit JFK and the Governor of Texas at the same time."--HST    **"A man who works with his hands is a laborer.  A man who works with his hands and his brain is a craftsman.  A man who works with his hands, brains, and heart is an artist."  -Louis Nizer**

ducpainter

#23
February 26, 2010, 04:13:12 PM
Quote from: Monsterlover on February 26, 2010, 04:10:49 PM
Am I the only one that uses a die grinder with a sanding disc on it and a set of mics to check?
Yes
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


Monsterlover

#24
February 26, 2010, 04:22:32 PM
Why do you think that is?
"The Vincent was like a bullet that went straight; the Ducati is like the magic bullet in Dallas that went sideways and hit JFK and the Governor of Texas at the same time."--HST    **"A man who works with his hands is a laborer.  A man who works with his hands and his brain is a craftsman.  A man who works with his hands, brains, and heart is an artist."  -Louis Nizer**

ducpainter

#25
February 26, 2010, 04:25:18 PM
Quote from: Monsterlover on February 26, 2010, 04:22:32 PM
Why do you think that is?
'cuz you're awesome...

or just don't care if the surface is flat.

Not sure. :-*
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


Monsterlover

#26
February 26, 2010, 05:30:52 PM
It's the awesome part.

For the record, the openers I did came out flatter than they came from the factory.
"The Vincent was like a bullet that went straight; the Ducati is like the magic bullet in Dallas that went sideways and hit JFK and the Governor of Texas at the same time."--HST    **"A man who works with his hands is a laborer.  A man who works with his hands and his brain is a craftsman.  A man who works with his hands, brains, and heart is an artist."  -Louis Nizer**

ducpainter

#27
February 26, 2010, 05:37:12 PM
Quote from: Monsterlover on February 26, 2010, 05:30:52 PM
It's the awesome part.

For the record, the openers I did came out flatter than they came from the factory.
How do you know? [evil]
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


Monsterlover

#28
February 26, 2010, 06:31:08 PM
[austin powers]Allow myself to quote. . . myself [/austin powers]

Quote from: Monsterlover on February 26, 2010, 04:10:49 PM
Am I the only one that uses a die grinder with a sanding disc on it and a set of mics to check?
"The Vincent was like a bullet that went straight; the Ducati is like the magic bullet in Dallas that went sideways and hit JFK and the Governor of Texas at the same time."--HST    **"A man who works with his hands is a laborer.  A man who works with his hands and his brain is a craftsman.  A man who works with his hands, brains, and heart is an artist."  -Louis Nizer**

Popeye the Sailor

#29
February 26, 2010, 07:07:42 PM
Quote from: Monsterlover on February 26, 2010, 06:31:08 PM
[austin powers]Allow myself to quote. . . myself [/austin powers]


I believe the gist of Nate's question was how do you know they weren't flat from the factory"? If you don't know their flatness initially, you can't argue they are now flatter than they originally were.

AKA, you is wrong, biznitch  :-*
If the state had not cut funding for the mental institutions, this project could never have happened.
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