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Thread: Solid Seat Pan Thickness

  1. #1

    Wink Solid Seat Pan Thickness

    What is the general consensus regarding minimal thinness for an alluminum solid seat pan?

    I weigh ~150lbs
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  2. #2
    Senior Member sowseng's Avatar
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    Quote Originally Posted by Covathalis View Post
    What is the general consensus regarding minimal thinness for an alluminum solid seat pan?

    I weigh ~150lbs
    I use a 6mm plywood for my first chair, too hard

    Second chair, 3mm 7020 aluminum sheet, just nice, it will bent nicely when sit on top, but does not absorb impact when dropping curb.

    Third chair, the worse seat pan I ever sit, 1 mm welded 6061 aluminum sheet with reinforce hole drill (see picture 1), and it is solid like anything. Even with cushion on, my bottom still pain like anything.

    So I cut off the aluminum, replace with 5mm polycarbonate, it hold me firm, and absorb impact when dropping curb.(picture 2)

    To conclude, follow this rules when choosing your seat pan thickness:

    1. Choose something that will bent nicely when you sit on top, which fit your butt contour.
    2. Choose something that will bounce a little to absorb impact.
    3. Don't go for really hard material.
    4. Choose something that can bear your weight.


    Picture 1
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    Picture 2
    Name:  20160304tmoscw40.jpg
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    Life is meaningles, though you create the purpose.

  3. #3
    Quote Originally Posted by sowseng View Post
    To conclude, follow this rules when choosing your seat pan thickness:

    1. Choose something that will bent nicely when you sit on top, which fit your butt contour.
    2. Choose something that will bounce a little to absorb impact.
    3. Don't go for really hard material.
    4. Choose something that can bear your weight.
    Do you think something like this would be suitable for a seat pan? http://www.ebay.co.uk/itm/Clear-Acry...1%26rkt%3D1%26

    But I wouldn't know what thickness to go for? My chair is 15" and I weight 8.5 stone and thought 4mm seems about right? But I don't know, I want it to dish slightly but not snap so I end up with my bum wedged in the frame! Btw do the side rail holes need to be elongated to allow the sheet to flex?

  4. #4
    Senior Member sowseng's Avatar
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    Quote Originally Posted by Mr Tippy View Post
    Do you think something like this would be suitable for a seat pan? http://www.ebay.co.uk/itm/Clear-Acry...1%26rkt%3D1%26

    But I wouldn't know what thickness to go for? My chair is 15" and I weight 8.5 stone and thought 4mm seems about right? But I don't know, I want it to dish slightly but not snap so I end up with my bum wedged in the frame! Btw do the side rail holes need to be elongated to allow the sheet to flex?
    Do not use acrylic board, it will break.
    Just use velcro attach to the frame, it will flex very nicely.
    8.5stone? how many lbs?
    Life is meaningles, though you create the purpose.

  5. #5
    Senior Member NW-Will's Avatar
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    Do you have more details on the polycarbonite you're using ?
    How heavy is it ?
    grade type ?

    1 stone = 14lbs

    8.5 stone = 119lbs



    Quote Originally Posted by sowseng View Post
    Do not use acrylic board, it will break.
    Just use velcro attach to the frame, it will flex very nicely.
    8.5stone? how many lbs?

  6. #6
    Senior Member sowseng's Avatar
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    Quote Originally Posted by NW-Will View Post
    Do you have more details on the polycarbonite you're using ?
    How heavy is it ?
    grade type ?

    1 stone = 14lbs



    8.5 stone = 119lbs
    Name:  polycarbonate weight.jpg
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    My polycarbonate sheet is 37.5cm x 35.5cm, 5mm thick, it almost weight 1kg.
    I am not happy with the weight, may be it is not a good quality polycarbornate, it is made in China.

    Will try other polycarbonate later, hopefully stronger and lighter.
    Last edited by sowseng; 09-22-2016 at 06:39 AM.
    Life is meaningles, though you create the purpose.

  7. #7
    hi sorry this might be a little off topic but im sure when i was looking at a solid seat pan there was someone who weighed both the canvas and the seat pan strips to find out how much both weighed in comparison, does anyone know the weights or where i can find out? thanks

  8. #8
    Senior Member NW-Will's Avatar
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    Cheers.

    Yes be interested to hear about your polycarbonite experiment.. I'm still messing around with plywood.

    for the americans
    37.5cm = 14.76 inches
    35.5cm = 13.96 inches
    1kg = 2.2lbs







    Quote Originally Posted by sowseng View Post
    Name:  polycarbonate weight.jpg
Views: 302
Size:  49.3 KB

    My polycarbonate sheet is 37.5cm x 35.5cm, 5mm thick, it almost weight 1kg.
    I am not happy with the weight, may be it is not a good quality polycarbornate, it is made in China.

    Will try other polycarbonate later, hopefully stronger and lighter.

  9. #9
    Senior Member sowseng's Avatar
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    Quote Originally Posted by NW-Will View Post
    Cheers.

    Yes be interested to hear about your polycarbonite experiment.. I'm still messing around with plywood.

    for the americans
    37.5cm = 14.76 inches
    35.5cm = 13.96 inches
    1kg = 2.2lbs
    Plywood is cheap and easy to work with, it does not bent when you sit on top, but not as solid as those really hard material, still a very comfortable choice.
    Life is meaningles, though you create the purpose.

  10. #10
    Quote Originally Posted by sowseng View Post
    Do not use acrylic board, it will break.
    Just use velcro attach to the frame, it will flex very nicely.
    8.5stone? how many lbs?
    Hi, sorry I missed your reply, 8.5 stone is approx 120lb (US).

    I always get confused between acrylic and polycarbonate. But I've suddenly remembered that safety spectacles lenses are made of polycarbonate. Is the difference between polycarbonate and acrylic that polycarbonate is laminated and thus stronger?

    I'm having trouble finding polycarbonate sheet in the UK. If I search eBay UK it just returns corrugated polycarbonate sheet for use in greenhouses, but no flat sheeting? http://www.ebay.co.uk/sch/i.html?_fr...sheet&_sacat=0

    EDIT: I've managed to find some solid polycarbonate sheet at a reasonable price here. http://www.ebay.co.uk/itm/161981671914

    I'm not sure what thickness to go for, I want it to flex some when I sit on it but not too much. I was thinking of perhaps 3mm or 4mm?

    What do you think?
    Last edited by Mr Tippy; 10-12-2016 at 11:17 AM. Reason: New info

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