Scaling up to scaffold tubing…

New Home Forum Mostly Printed CNC – MPCNC Troubleshooting – MPCNC Scaling up to scaffold tubing…

This topic contains 14 replies, has 5 voices, and was last updated by  chevydan6 2 years, 1 month ago.

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  • #2769

    Roderick
    Participant

    Just a tip or hint really.

    I noticed scaffold tube is very cheap too and there are a lot of cheap coupling pieces / connections possible ..
    cast corner block will be something like $7.00 only….

    common europe diameters are : 26.9 mm , 33.7 mm, 42.4 mm , 48.3 mm and 60.3 mm

    Maybe for a future set….

    #2805

    Ryan
    Keymaster

    I’ll have a look. If you get a chance could you tell me the next few bigger sizes of conduit. No rush just next time your at a hardware store.

    #2810

    Roderick
    Participant

    Ok, Here are a few :

    Plumbing : copper tubes (tapwater) and galvanised steel tubes (central heating)
    come in sizes/diameters : 12, 15, 22, 28 and 35mm (wall thickness steel : 1,25 or 1,5 mm)

    Scaffold tube (6 meter lengths / diameter = outside diameter)
    Galvanised Steel

    Diameter tube: 26,9 mm / wall thicknes: 2,65 mm
    Diameter tube: 33,7 mm / wall thicknes: 3,25 mm
    Diameter tube: 42,4 mm / wall thicknes: 3,25 mm
    Diameter tube: 48,3 mm / wall thicknes: 3,25 mm
    Diameter tube: 60,3 mm / wall thicknes: 3,65 mm

    Aluminium

    Diameter tube: 27 mm / wall: 2,5 mm
    Diameter tube: 33 mm / wall: 3 mm
    Diameter tube: 42 mm / wall: 3 mm
    Diameter tube: 48 mm / wall: 3 mm
    Diameter tube: 60 mm / Wall: 3 mm

    The international version is now 25MM. These tubes are available but not very common.
    25mm is mostly used for showroom/display/wardrobe tubing and are available in aluminium, or coated steel (like : 25mm chrome coated steel / 2 mm wall)

    #2815

    Ryan
    Keymaster

    Awesome thank you very much. I’m getting data to try and make a version 2 But I don’t want to make and maintain 2 versions again.

    #2825

    Roderick
    Participant

    Can’t find 25mm tube ? … Unless you’re way up in the mountains or wandering the desserts, ask your local yachting/boat/watersport shop for some 25mm railing tube (Stainless Steel 316, Polished / High Gloss 25 x 2,0 mm)

    You’ll probably have to fork over a tiny small wee bit more dough (cough) .. but then again .. bling it ! :):):)

    #2831

    lcltech
    Participant

    25mm is also relativly hard to come by in Denmark and northen Germany. For Plumbing we(in Denmark) used the same dimension(26,9 mm) as you do for Scaffolding. It is called 1inch tubing, due to the inner diameter.

    It could be very very nice if we somehow could make the whole thing parametric. Width in a certain range say 20-30mm. Perhaps make stl from SW without the holes. The import stl in openscad scale it man the make the holes.

    PS. Thanks to Vicious1, I am really enjoy making the project.

    #2832

    Ryan
    Keymaster

    You’re not looking for plumbing pipe, you need electrical conduit. I know it is available in your area. I have 3 users living and using them there. I’m sure one of them will chime in at some point. Plumbing pipe is made to flex/give a bit so it doesn’t break when things move. Electrical conduit is made to span longer distances so less mounting hardware is needed for install.

    Look at the international edition on thingiverse, all of those parts would need to be parametric. That is a huge undertaking, then each tool mount after that would need to parametric. I would not even know where to begin writing that program.

    I am doing my best to support both current builds and develop another build that is more universal. I had no idea how well this was going to work, everyone told me I would be lucky to mill HD foam. Now that the concept has been proven and far exceeded expectations, on to a new build that looks and performs better while making production and assembly easier with parts available worldwide. Tall order.

    Hope this doesn’t come off the wrong way, just trying to state my position so we can all focus on developing a better build with commonly available parts that are inexpensive. Problems are very easy to solve when you throw money at them (cast steel parts, huge bearings, specialized hardware), I’m more interested in getting this in everyone’s workshops for the smallest cost possible.

    #2833

    lcltech
    Participant

    25mm conduit is not ready available in hardware stores in DK nor GE. I don’t think it is used very much in DK. Some online hardware stores have some that they 25mm/1inch. It is not clear whether this means 25.4mm or actually 25mm. I would not surprise me if both type exits. I found some 25mm tubing used for clothing racks in dimensions that fits to my needs. I dont even need to cut anything. The down side is that it is only 1mm think, but it will have to do for now.
    25mm railing tube is also available but 30USD pr m it is a bit expensive but worth considering.
    You have a good point regarind plumbing vs. conduit.

    I think it is great that you are also making a 25mm IE version and appreciate the extra work.
    I did not expect you to make the parametric version, just throwing the idea out there.

    #2834

    Roderick
    Participant

    To make things complicated, be aware of old, ancient and new measurements.

    Scaffold tube in 26,9mm will have wall thickness of 2,65 mm meaning inside diameter will be 26,9 – 2,65 – 2,65 = 21,6 mm which IS NOT 1 inch or 1″
    1 inch = 25,4 mm

    If indeed you have 26,9 out- and 25,4 inside then wall thickness = (26,9-25,4) / 2 = 0,75 mm … Totally unusable.

    My guess is (since you mention plumbing) that you have 1″ galvanised tube which would not necesseraly be an inch but might also be reffered to as “thumb”.
    These pipes are used in , for instance, sprinkler systems as galvanised steel pipe is NOT used for drinkingwater (there you would use copper or plastic (tyleen) tubes)

    Dependig where you live , 1 thumb (written 1″) can be anywhere between 24 and 27 mm….
    Swedish wiki for instance : tum – Thumb (inch), 1/12 fot, 2.474 cm. After 1863 1/10 fot, 2.96 cm, not much accepted by professional users in mechanics and carpentry who later switched to English inch (2.54 cm, abandoned only late 20th century) and metric system.

    Anyway , if you take an average 1 thumb ( 1″) tube it would typically have an outside diameter of 33,7 mm ….

    #2836

    lcltech
    Participant

    You er right. My memory failed me. I was thinking of 3/4″ tubing. The nominal outside diameter is 26.9mm.

    #2837

    Roderick
    Participant

    “You’re not looking for plumbing pipe, you need electrical conduit”

    I think , metallic conduits (copper / galvanised steel) can only be used for water / gas. These sizes are in mm or thumb, not inches….
    Steel electrical conduits aren’t being used here since the sixties, as we say : “the shit don’t mix” (electric wires and steel conduit is a dangerous combo , espcially the old tubes with weld seams, maybe they are being used in some professional setup but as far as i know they now use flame retardant electrical conduit made of some kind of plastic…)

    Hence : not available….

    #2841

    kawobei
    Participant

    Easy to find electrical conduit in Australia, they have regulation when electrical cable must span x distance or be protected against high risk impact area so the gal conduit is in every electrical wholesaler.

    Thank you for making the international version. 🙂

    #2850

    Roderick
    Participant

    In case your tubes are to thin and you want to stiffen your construction :

    Fit a smaller diameter pipe inside yours covered with some expanding glue like poyurethane.
    Best option is to fit a triangle if you can , triangles are stiffer than circles…

    #2852

    Roderick
    Participant

    And maybe… just maybe we can use a excenter filler ring inserts and smaller bolts (M6 instead of M8) for the runners so we can fit 26.9mm tube on a 25mm version…

    like this :

    With an option like this we can make different tube diameter versions for the moving parts by just changing some small filler rings….

    The couplings for the corners are often available for the tube system being used like

    #3849

    chevydan6
    Participant

    Or how about getting 3/4 inch drill rod. Already solid and can be surfaced hardened.

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