Photo by Melody

Grass and Bamboo: Caliper to measure diameter of bamboo clum

Communities > Forums > Grass and Bamboo
Forum: Grass and BambooReplies: 7, Views: 74
Add to Bookmarks


Brooksville, FL
(Zone 9a)

September 25, 2011
11:33 AM

Post #8823392

Does anyone know where I can find a caliper for measure diameters of trees or bamboo?

Any help with a web site to order from would be appreciated very much.



Everett, WA
(Zone 8a)

September 27, 2011
4:53 PM

Post #8827067

Wrap a piece of paper tightly around the culm and mark where it overlaps.
(To be fussy, push a pin through both bits of paper and measure dot-to-dot.

Measure the length of the piece of paper (circumference).

Diameter = circumference divided by Pi (3.14)

It's probably easier to measure and divide in metric (millimeters),
then convert to inches (one inch = 25.4 mm).

This has the advantage that any error in meaurement is divided by three, so it's as if your ruler had three times the resoluton it really does.

Use a Xerox machine to copy a ruler onto some paper at 100% size. Now you can read the circumference right off the paper (you still have to divide that by 3.14.

Or use a fancy Zerox machine to blow that ruler up by 314% and read the diameter right off the paper.

Or use any crescent wrench on the culm, then slide it off and hold it on top of a ruler to read the diameter directly.

If you're doing a LOT of these measurments, make some "GO - NOGO gauges" from cardboard or sheet plastic.
Cut them to the sizes you're interested in, say every 1/8th inch from 3/4" to 2". The smallest one that slips over the culm is the size.

I got my digital calipers from Harbor Freight, but the Google search "amazon micrometer" gave several options.

Does anyone know if quoted diamters tend to reflect the thckest bulging part of a joint, or the narrowest part in the center of a section?

Dahlonega, GA

September 29, 2011
6:19 AM

Post #8828947

And I flunked algebra !


Brooksville, FL
(Zone 9a)

September 29, 2011
12:06 PM

Post #8829378

I know how, I just would like to have the caliper, which I found after posting on ABS's face book page. thanks

Dahlonega, GA

September 29, 2011
1:18 PM

Post #8829467

Hi again, Jan . Honest , I'm not following you around . LOL


Brooksville, FL
(Zone 9a)

September 30, 2011
8:02 AM

Post #8830369

we will just follow each other...LOL

Brunswick, GA
(Zone 9a)

November 22, 2012
5:41 PM

Post #9340201

I've seen outside calipers at HD, now that you've reminded me i think i will check there again in the morning. Lowes may also have them...


Everett, WA
(Zone 8a)

November 28, 2012
7:54 PM

Post #9345091

If you have a pipe wrench or crescent wrench, you have an outside caliper.
Or even a screw-clamp.

Tighten the jaws until they press against the culm.
Pull it off, take it indoors.

Read the gap with a ruler.

But are they measuring the narrow spots, or the bigger O.D. of the joints?

You cannot post until you register, login and subscribe.

Other Grass and Bamboo Threads you might be interested in:

SubjectThread StarterRepliesLast Post
bamboo stakes tiG 10 Nov 3, 2011 1:16 PM
Black bamboo question linden 51 Aug 6, 2008 3:15 PM
Hardy bamboos at zone 6 Esther_z6 21 May 6, 2008 12:31 AM
A few clumps of my grass :) hczone6 32 Sep 5, 2007 2:47 AM
Bamboo Seedling Speedyg 2 Feb 16, 2008 3:54 PM

Overwhelmed? There's a lot to see here. Try starting at our homepage.

[ Home | About | Advertise | Media Kit | Mission | Featured Companies | Terms of Use | Tour | Rules | Privacy Policy | Cookie Policy | Contact Us ]

Back to the top

Copyright © 2000-2015 Dave's Garden, an Internet Brands company. All Rights Reserved.

Hope for America