What a mathematical error!!!!

[Resu]

Measure six times, cut once.

More like measure once, join six times!

Usually if we're pacing a couple of us would do it and take an average. Been a bit off a few times but usually the other way. 37m is alot!

Now I think of it the last run of SWA I pulled in ended up about 6m short on a short run of about 50m. The digger driver who laid the ducting was still on site at the time and offered to measure it out as he had a proper measuring wheel. I took the number he gave me and did the usual rounding up but still ended up 6m short!

Might be a chance the wholesaler has made a blunder?

 

[nicebutdim]

One of my colleagues paces everything and never goes wrong. I know what would happen if I paced distances, so

More like measure once, join six times!

Usually if we're pacing a couple of us would do it and take an average. Been a bit off a few times but usually the other way. 37m is alot!

Now I think of it the last run of SWA I pulled in ended up about 6m short on a short run of about 50m. The digger driver who laid the ducting was still on site at the time and offered to measure it out as he had a proper measuring wheel. I took the number he gave me and did the usual rounding up but still ended up 6m short!

Might be a chance the wholesaler has made a blunder?

A colleague paces everything and I'm yet to see him get it wrong. I know how that would work out for me, so everything is measured + a bit. If it's a particularly awkward run I also get someone else to work it out, without first telling them my estimate, and see how the two compare.

 

[brianmoooore]

I've always been near enough spot on when pacing out for a buried cable. I can almost guarantee to be within a metre on a 100m run, but errors can occur if there are vertical bits and runs inside buildings that are measured separately. It's all to easy to forget to add in one of these extra measurements.

 

[Lucien Nunes]

@HappyHippyDad when did you last send your legs off for calibration?

Seriously, the way to do this is to use both measurement methods side by side for a dozen or two jobs, comparing and adjusting your pace and eyeball estimates until they agree consistently with the tape measurements. Once you are satisfied that the results are accurate and repeatable enough you can bypass the tape measure stage.

Before I had minions to do it for me, I used to make audio / video / control cables in the workshop that would often be 5, 10, 20m in length and I would impress people by just pulling the cable off the reel rack and geting the length accurate to a fraction of 1%. E.g. two 10m cables pulled separately would be within a couple of cm. The only reason I could do this was that I had carefully calibrated my reach by repeated comparisons with the tape and would refresh the calibration regularly to avoid long-term drift.

A method that I use when estimating installed cable length is to visualise conduit lengths in position. I can very easily gauge where the end of a 3m would be, even on a run with a couple of bends in. So I will look at the wall and imagine a 3m length in place, rigidly fix the end point and then imagine the next length following on from that. If a 3m won't fit in one 'visualisation' then I imagine a cut length that is always a multiple of 0.5m.

 

[mattg4321]

Not sure how you could be that far out. Pacing it out never lets me down. I usually end up with too much if anything.

As above it could be a wholesaler error? They once gave me 50% too much as their machine played up!

Also could be you forgot to add a section etc? Did you pace it again when you went back?

 

[nicebutdim]

Just realised that it was 37m short on a 125m run!!

You must be 9' tall

 

[7029 dave]

That is way out, its BIG strides Steve not pigeon steps.

 

[pc1966]

I got one of these for getting distances sort-of right:

Mini Measuring Wheel

Aluminium with plastic wheel

www.cef.co.uk

Check the route again to see if it is close to your estimate, as above you might have got less cable than ordered!

Just to add, the wheels on that one are not very big (15cm-ish?) so it struggles with rough ground. Some of the single wheel but larger models might have been better for out door work. For example:

https://www.NoLinkingToThis/p/measuring-wheel/3963v

 

[buzzlightyear]

Bosch GWM40 Measuring Wheel - https://www.NoLinkingToThis/p/bosch-gwm40-measuring-wheel/3490k , you can sit on this when measuring and join the circus .

 

[HappyHippyDad]

I'd love to be able to replay the day when I made the strides, just to see where the error occurred.

I think it was a mixture of poor strides AND simply missing a whole section of the run for whatever reason. I think I added it up in bits, so possibly just left out a 37m bit in the adding up. Also, at the end of the day and feeling pretty exhausted.

Pretty much the entire barn area was around 37m.

Anyway, no more strides for me.