Method needed to measure 2000mm lengths to ?0.5mm - Alumin(i)um extrusions

M

Mezzaluna

#1
Method needed to measure 2000mm lengths to ±0.5mm - Alumin(i)um extrusions

Hello Folks!

Trying to set up a method of controlling the length of alumin(i)um extrusions. These can be anything from 800mm - 2000mm in length. The tolerance specified is +/- 0.5mm. Any suggestions on a measuring device? I don't want to resort to a 2m steel rule bolted to a bench.
The cross sectional dimensions are 20mm X 20mm.

thanks for the help!

Mezz.
 
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Miner

Forum Moderator
Staff member
Admin
#2
Mezzaluna said:
Hello Folks!

Trying to set up a method of controlling the length of alumin(i)um extrusions. These can be anything from 800mm - 2000mm in length. The tolerance specified is +/- 0.5mm. Any suggestions on a measuring device? I don't want to resort to a 2m steel rule bolted to a bench.
The cross sectional dimensions are 20mm X 20mm.

thanks for the help!

Mezz.
If you can develop a method for establishing a repeatable nominal to set the gage to, the Mitutoyo Digimatic Scale Unit would work well. You can program an absolute position into it one time, and it will hold the position even turned off.

See http://www.mitutoyo.com/catalog/pdf/I-22-23-24.pdf
 
S

sarasheed

#3
Method needed to measure 2000mm

We have procured one Digital Vernier caliper of size 0 to 3000mm from M/s. Trimos.This vermier will be useful for your purpose.

S.A.Rasheed
 

Paul F. Jackson

Quite Involved in Discussions
#4
Use an beam with a stop on one end and an adjustable test indicator on the other. Master it with artifacts and measure the part at a common stabilized temperature every time or your readings will not repeat.
 

Wes Bucey

Quite Involved in Discussions
#5
I'm just curious - how many extrusions do you have to measure of a specific size in an order (1? 10? 100? more?)

Depending on the quantity of a size to be measured each time, it does make a difference whether to have "a 2m steel rule bolted to a bench" (I think something more like a variation of miner's suggestion) or to use an instrument like a 3 meter vernier. I wonder about the burr after cutoff - I've seen some "interesting ones." Obviously, you will want to assure the cutoff is square and not slanted - I could envision a piece with a cut NOT perpendicular to the long axis which could be within tolerance along one side of the 2000 mm length and on the other side of the 20 mm width be out of tolerance.

In any event, you will have to have a flat surface to lay the piece on to avoid sag affecting the reading.
 
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