Two Peg Test

The Two Peg Test is a quick way that you can check that your automatic level and even a laser level is giving you accurate readings.

[@TDub0807]

You are such a good teacher, so clear and concise! Thanks again Buildsum

[@Buildsum]

Thanks Mate

[@watsonbedzrah7121]

This tutorial just helped me run a two peg test at work as a Trainee Geomatic Engineer. Thanks!!!

[@Buildsum]

Watson Bedzrah Thanks for letting me know Watson, it never ceases to amaze me just who finds these videos useful

[@Thespecialone1970]

Fantastic. Thanks so much. Currently doing a bachelors in construction and your videos are helping out massively.

[@Buildsum]

Thanks Mate, great to know that the videos are still useful at that level of learning.

[@lachiejg5838]

Great animation mate and very well explained. This has helped me with my surveying assignment at uni so thank you.

[@Buildsum]

Thanks Mate, Great to hear!

[@Akira-xr2zb]

Thanks for the great video!

[@Buildsum]

Thanks Mate, I'm glad you like it.

[@Akira-xr2zb]

Absolutely amazing, the software you used is impressive, what is it called please?

[@Buildsum]

Hi Mate, I use SketchUp for all my drawings.

[@wasiusanni9568]

Thank you for sharing, it's beneficial and explanatory. I will love to know how this animation are done. Thanks once again.

[@Buildsum]

Hi Mate, all my drawings are done in SketchUp and set as different views then i just transition from one to the next. Hope this helps

[@finnersz]

yes you legend. cheers for this, you're better than google!

[@annw8909]

wow, thank you that makes sense now,,,, just had a bunch of written instructions from tutor, on how to do this but this animation is great! Thank you . A new Sub for u.

[@Buildsum]

Thanks Ann, I'm glad to hear that it helps.

[@ObaPosh]

Very explanatory, understand it once made sense.. thanks

[@Buildsum]

Thanks Mate, I'm glad it was helpful!

[@Killertheman]

Well done boss 😊

[@Buildsum]

Thanks Mate, I'm glad you like it.

[@al-harthial-harthi7007]

Thank you, that was clear and easy to understand

[@Buildsum]

Thanks Mate.

[@dinoroy8962]

It's crystal clear, great help

[@Buildsum]

Thanks Mate.

[@KingcadeHome]

Thanks so much !

[@Buildsum]

No worries!

[@zukilegwebityala7313]

Thank you so much, this video explained it properly & I well understand it now

[@Buildsum]

Thanks Mate Glad you like it

[@AHAO.studio]

Very creative animation!

[@Buildsum]

Thanks Chris.

[@AhmedRw]

Thank you so much You saved my life Got new job and had to know this before start Coz its rail leveling and its +-2 millimeters, so the level must be perfect, thnx m8

[@Buildsum]

+ahmed wrya rwandwzy Thats great congratulations glad i could help

[@NoelioKearog]

Great video, well explained. Thanks

[@Buildsum]

Thanks Noel, Glad you like it

[@mathank994]

This test helps to eliminate collimation error

[@Buildsum]

it is mainly to ensure that the instrument is still accurate.

[@nixiscarrero3555]

Nice tutorial very clear explanation :)

[@Buildsum]

Thanks mate.

[@obedtari8390]

Thank you Australian Man

[@Buildsum]

Thanks Mate.

[@Techn0Dazza]

Cheers for the help pal, I needed this for my project tomorrow. XD

[@patrickjake7227]

Thanks for this 👍🏻

[@Buildsum]

Thanks Mate, My pleasure!

[@jacobdrovandi1507]

Thanks for the vid mate.

[@Buildsum]

Thanks Mate, No problem 👍

[@darrylw6191]

After taking the 1st set of readings, I assume that when you reposition the level that the telescope needs to re-leveled before the 2nd set of readings. Is that correct?

[@Buildsum]

Hi Mate, yes it needs to be releveled before you take more readings.

[@andyrichmond1858]

I stand corrected. Thank you I now understand.

[@Buildsum]

Not a problem i'm glad you asked the question because i can't guarantee that i will get everything correct.

[@kolaalade4921]

Thanks for this. Does this have to be on a levelled surface? I got an error of 310mm. Perhaps because the levels of my pegs varied so much

[@Buildsum]

Hi mate, no it doesnt have to be on a level surface, as long as you get the same error for both sets of readings then you are all good.

[@new_boy74]

good tutorial except for at 3:00

[@Buildsum]

Thanks mate

[@samkelomacinga3983]

this is perfect, thank you :)

[@Buildsum]

Hi Mate, I'm glad you like it!

[@wadeseymour4828]

great explanation, is there a clip of how to adjust the dumpy calibrated properly? I am deep in the bush and cannot send it away everytime it need recalibrating.

[@Buildsum]

Hi Wade, thanks for your comment, no that I am aware of, it is a pretty technical process and normally would go back to the manufacturer or similar for calibration however if the instrument is looked after it is not something that needs to be done regularly.

[@wadeseymour4828]

thanks for the reply, I agree, except my dumpy levels are 'hire equipment' so god only knows how they are treated by the hirer!!! I'm in Zambia and sending them back for calibration is a cross border excersise.

[@raulf100]

cheers cob

[@luisramos2521]

Nice

[@Buildsum]

Thanks

[@haroon5931]

fantastic video thanks for sharing with us :)

[@pablo65315]

amazing vid, thanks so much!!!

[@Buildsum]

+paul c Thanks Paul Glad you like it

[@alexandredoprado9241]

What is the acceptable error? Is there some official standard that define the acceptable error?

[@Buildsum]

Hi Alexandre I would say that a 2 - 3mm error over the distance shown in the video if you were getting 5mm or more I would be rechecking and if you still get the same error then you would need to get the instrument recalibrated.

[@SatyamKashyap27]

Tnx

[@omerk307]

Hello Buildsum. :D. I am just curious. I am thinking of studying Surveying and Spatial Information Services at TAFE. I have done a bit of Surveying before when I once Studied Civil Engineering at TAFE and I have done a little bit more research on it now seeing as I am thinking of taking up the course at TAFE hopefully. Call me dumb but a thing that still confuses me and I still cannot get right is the difference between 'Backsight' and 'Foresight'. A problem I have when I did certain tests on the field (Two peg test, Level run etc) is trying to work out where to place my instrument on the ground to where I am trying to find the 'Backsight' with my instrument or even when I am trying to workout the 'Foresight' with my instrument. Do you think maybe you can give me some pointers on getting the 'Backsight' and 'Foresight' and where exactly to position my instrument no matter where the point is positioned? Thank you. :D.

[@Buildsum]

Omer K HI Omer A Backsight is the first reading that you take once you set up your instrument. The Backsight should be taken "back to point that you know something about" either the RL or a point that you have previously taken a reading on. The foresight is the last reading that you take before you move the instrument "looking forward to the move" As for placing the instrument it come with experience but it should be placed so you can get the maximum number of points while avoiding all obstacles and not getting to far away from the points 30 - 40 metres max Hope this helps

[@bruce9380]

Thanks dude ;)

[@ahmadqaissamarqandi4230]

Thanks its useful

[@johnkaz818]

Do you made video with precision leveling like they made for heavy machinery use precision level and precision rode level PLEAS

[@Buildsum]

john kaz Hi John No sorry nothing like that

[@nisw1918]

What if its off could you turn the two bolts at one end of the scope up or down as needed and split the difference until its true ? Mine has one locking and two adjusting bolts on one end or at least I think thats what their for .

[@beautydeals87]

hi its very helpful and easier way thank :)

[@farhangqadr2327]

thanks for u thats helpeful

[@ahmadqaissamarqandi4230]

Hi how I con find distance between level machine and rod?

[@Buildsum]

Ahmadqais Samarqandi Hi Try this video kzbin.info/www/bejne/rYrIcnimhZaBj9E

[@edrosegreengrass1534]

It was awesome 👌👌👌

[@Buildsum]

Thanks Mate

[@wongteckfei]

How about collimation error?? Any correction require?

[@Buildsum]

Teckfei Wong Hi most instruments will need to be returned to the manufacturer or a service agent to be re calibrated or you may just have to work with it and keep you distance to the staff short to minimise the error.

[@bananian]

this is really confusing.

[@andyrichmond1858]

I think you miscalculated mate. Its 10mm difference.

[@Buildsum]

Hi Andy the 10mm is the difference in height between Peg A and Peg B however this is not what i need to know. I need to know the difference between the two readings on each peg from the two different instrument positions, 20mm, this is the difference in height when the instrument was set up in the different positions. If this difference varies then the instrument is out of calibration

[@anthonetachifamba3137]

Wow..

[@laxmikadriya6233]

maasala giddha aali bhujini garera bolna...

[@rikmiles6531]

Nice try with animation but, it is so much simpler than all that. Trying to watch animation is cumbersome Video should be about animation not survey