Flat Surface Granite Table Calibration Requirements

L

lostmanager

#1
Does a flat surface table or a flat surface granite section, has to be calibrated. This is what our height gage sits on, and the flat surface sits onto a table. Its 12 x 18 x 4.5.
 
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Jim Wynne

Staff member
Admin
#2
Does a flat surface table or a flat surface granite section, has to be calibrated. This is what our height gage sits on, and the flat surface sits onto a table. Its 12 x 18 x 4.5.
The universal answer: It depends.

How critical is the flatness of the surface plate to the measurement of product? How old is the plate, and how much use does it get? Has it ever been calibrated?
 
L

lostmanager

#3
Something that I just noticed today while doing inspections. If our height gage sits on top of the flat surface then it has to be critical, I would think. Not sure how old it is, it not on my calibration list and cannot find a certificate.
 

Michael_M

Trusted Information Resource
#4
Does a flat surface table or a flat surface granite section, has to be calibrated. This is what our height gage sits on, and the flat surface sits onto a table. Its 12 x 18 x 4.5.
We typically calibrate 10 of our 14(ish) surface plates. On average, the calibration cost is $60.00 to $90.00 per plate (this includes the travel cost as we have them come to us). If you are only doing 1 plate, I would make the assumption:bonk: that it would be a bit more.

The plates that are not calibrated have a big white label (in red letters) on the side that states, "not in calibration".
 
L

lostmanager

#7
1 one of them I know, because we use the height gage and the height gage sits on top of it.
 

Stijloor

Staff member
Super Moderator
#8
1 one of them I know, because we use the height gage and the height gage sits on top of it.
OK, but is the height gage used to inspect parts according your and your Customer's specifications? That's a key factor in deciding if the surface plate needs to be included in your calibration process.
 

Ninja

Looking for Reality
Staff member
Super Moderator
#9
We have a height gage on a granite block, and the gage needs calibration but the block does not.

This falls into Jim's answer above ("It depends")...

Our height gage is a single point gage measuring thickness of a flexible material...and the gage never moves in relation to the block...it always reads against the same point on the block...there fore it doesn't matter if the block is flat. There fore it does not need to be calibrated.

There are quite a number of "height gages"...which type is yours?

If the foot of the stand rides on the block, AND the gage is not directly over the foot, AND the measurement will be used to make decisions of import, AND the degree of flatness of the block can impact the reading to a significant degree compared to the needs...then yes, it would need to be calibrated.
 
L

lostmanager

#10
We have a height gage on a granite block, and the gage needs calibration but the block does not.

This falls into Jim's answer above ("It depends")...

Our height gage is a single point gage measuring thickness of a flexible material...and the gage never moves in relation to the block...it always reads against the same point on the block...there fore it doesn't matter if the block is flat. There fore it does not need to be calibrated.

There are quite a number of "height gages"...which type is yours?

If the foot of the stand rides on the block, AND the gage is not directly over the foot, AND the measurement will be used to make decisions of import, AND the degree of flatness of the block can impact the reading to a significant degree compared to the needs...then yes, it would need to be calibrated.

Our height gage is a Mitutoyo 18" DIGITAL HEIGHT GAUGE. I understand what you're saying about the flat surface table in respect to the height gage. Just making sure I'm in compliant with calibration standards. Thanks guys.
 
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