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New Funnel for Fine Offset

For discussion of DIY weather equipment - sensors, accessories, improvements to existing kit etc
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Richard Horton
Posts: 3
Joined: Sun 05 Jan 2014 2:10 pm
Weather Station: Fine Offset
Operating System: Windows 8.1
Location: Woodhall Spa, Lincolnshire
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New Funnel for Fine Offset

Post by Richard Horton »

After my last funnel gave up the ghost, I thought an engineering solution might be the answer, and as a picture paints a thousand word....
1RH_0272(1).jpg
1RH_0275 (2).jpg
1RH_0277 (1).jpg
Hopefully the material will be UV stable.... or the next plan is to make one out of aluminium, or perhaps do away with the original collector all together
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Richard

If it ain't broke, you're not trying hard enough.

www.martin-weather.co.uk

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mcrossley
Posts: 6922
Joined: Thu 07 Jan 2010 9:44 pm
Weather Station: Davis VP2
Operating System: Buster Lite rPi
Location: Wilmslow, Cheshire, UK
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Re: New Funnel for Fine Offset

Post by mcrossley »

Delrin? That's a sizeable chunk of whatever it is anyway!

Richard Horton
Posts: 3
Joined: Sun 05 Jan 2014 2:10 pm
Weather Station: Fine Offset
Operating System: Windows 8.1
Location: Woodhall Spa, Lincolnshire
Contact:

Re: New Funnel for Fine Offset

Post by Richard Horton »

mcrossley wrote:Delrin? That's a sizeable chunk of whatever it is anyway!
Acetyl Co-polymer and yes quite a chunk, next issue will be how to mount it, oh and try and remember how to work the fudge factor out.
Richard

If it ain't broke, you're not trying hard enough.

www.martin-weather.co.uk

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mcrossley
Posts: 6922
Joined: Thu 07 Jan 2010 9:44 pm
Weather Station: Davis VP2
Operating System: Buster Lite rPi
Location: Wilmslow, Cheshire, UK
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Re: New Funnel for Fine Offset

Post by mcrossley »

Richard Horton wrote:Acetyl Co-polymer and yes quite a chunk, next issue will be how to mount it, oh and try and remember how to work the fudge factor out.
I had to look up the difference. Did/could you not turn it to a diameter that came out as a nice round conversion factor? Second thoughts, that relies on the accuracy of the original FO part.

What I may do (if I had the time/skills/tools) is calibrate it as-is, work out what the diameter should be for a nice round conversion factor, and turn the rim down to that size.
Last edited by mcrossley on Thu 20 Feb 2014 9:48 pm, edited 1 time in total.

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mmcp42
Posts: 13
Joined: Wed 11 Dec 2013 9:21 am
Weather Station: own build
Operating System: Windows 7
Location: Leighton Buzzard

Re: New Funnel for Fine Offset

Post by mmcp42 »

do you intend to polish the inside?
I wonder if the non-smooth surface would impede the flow of water significantly?
weather station here: http://www.mmcpix.com/wx.html

hills
Posts: 687
Joined: Sat 26 Dec 2009 8:52 am
Weather Station: Fine Offset WH1091
Operating System: Raspbian Buster
Location: Crafers, South Australia
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Re: New Funnel for Fine Offset

Post by hills »

mmcp42 wrote:do you intend to polish the inside?
I wonder if the non-smooth surface would impede the flow of water significantly?
I was just about to say the same thing. I use a standard funnel about the same size and I've polished the inside with marine fibreglass polish to encourage the water to flow straight into the sensor. It really does make a difference as about ".3mm" used to stick to the sides.

I found it best to work out roughly how much bigger it is to the original and then use that, but then calibrate it with a good quality manual rain gauge mounted nearby. I went from .32 to .36 before it matched exactly. Also bear in mind, from memory, the calibration will affect all rain values collected so far.

Also would it be possible to make the rebate at the bottom large enough to completely sit over the original. That way I think it would be much more stable.

Great work!! :clap:

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