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  1. Replies
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    Thank you all for commenting. Roll forming might...

    Thank you all for commenting. Roll forming might be just outside of a garage workshop. Could this shape also be done on a press?
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    how is this profile shape made

    Hello everyone,

    greenhouse foil is often fixed in place with a profile that has the following shape.

    404054

    2 plastic profiles go inside and the end result looks like the last image. Sorry,...
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    1,504

    You asked the right questions. The reasons for...

    You asked the right questions. The reasons for such design is that the greenhouse is south facing, I will only use it to grow short crops (in autumn, winter and spring) and that the greenhouse cover...
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    Thank you all for ideas an tips. I ended up...

    Thank you all for ideas an tips. I ended up hiring a CNC bender.
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    Thats a great idea. Unfortunately it needs to be...

    Thats a great idea. Unfortunately it needs to be a pipe, because pipes are very practical when you have to linearly join them together. A situation that is very frequent in greenhouse constructing....
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    bending pipe with a concrete die, calculate springback

    Hello everyone,
    I am building a greenhouse using 40mm, 1.5mm hot dip galvanised steel pipes. I have a very distinct curvature in mind, that would maximize light input during early spring and late...
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    Thank you for stopping by. The equation listed...

    Thank you for stopping by. The equation listed calculates the real bending point, but it requires elongation length in the first place. I think some additional info is needed.
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    elongation when bending pipes

    When designing sheet metal bends I just type in K value into the program and flatten the 3d model to get the final flat design. I imagine elongation also occurs when bending round pipes. I found very...
  9. do blind rivets need to be used with a gasket and does the orientation matter?

    I hope to use blind rivets in an application where airtightness at low pressures is desired. I never used them before and have a few questions about the importance of orientation. Take this image for...
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    aluminum vs zinc plated steel rivnuts

    I am making some threaded holes in 2mm aluminum sheet. Does it matter if I use aluminum or zinc plated steel rivnuts? In what case are aluminum ones preferred over zinc plated and vice versa?
  11. Didn't quite get this. Why would a smaller...

    Didn't quite get this. Why would a smaller pressure drop (going from cylinder to BMH) draw more current at the fan? Or is it vice versa.

    I was playing around with how much plenum I need for...
  12. For reference, the pressure drops at 2000m3/h...

    For reference, the pressure drops at 2000m3/h were 410Pa for cylinder, 360Pa for cone and 227Pa for bell mouth hood. I continue to be amazed by how efficient bell mouth hood is.
  13. Thanks again for your help. In my design the...

    Thanks again for your help. In my design the slots for filters are 2mm smaller than the filter with gasket so that the filter would need to be pushed by force. That creates a challenge to get them...
  14. Thank you all for your suggestions and...

    Thank you all for your suggestions and professional point of view. I see you have lots of experience with filtration and sheet metal. I used to work in a lab Bob, but at the time I never wondered how...
  15. designing airtight filterbox - what thickness of sheet metal to use?

    Hello everyone!

    I am designing a filter box for H4,F7 and H13 filter for the house I am living in. The filters will be placed between air intake and central recuperation unit. I was forced to use...
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    Thank you for your insight. I'll do as you...

    Thank you for your insight. I'll do as you suggest.
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    Yeah, that sharp internal corner is apparently...

    Yeah, that sharp internal corner is apparently problematic. I do not understand why it can't be done in 2 passes. For exaple, in the first pass a sharp edge is created going from bottom to the top....
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    waterjet cutting a certain shape

    Hello! I am interested if you think it is possible to waterjet cut an edge as shown in the images using 5-axis machine (omax 80x). The green triangle part is apparently problematic.
    ...
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    Thank you all for feedback. I run a static...

    Thank you all for feedback. I run a static simulation test on a simplified model with the maximum drawbar pull force a tractor we'll use can generate and the stresses are 1.6-2.0 below the yield...
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    welding pipes with a fillet weld

    Hello everyone! I am designing a tractor implement for harvesting root crops. Similar to this one (https://www.youtube.com/watch?v=OrFVcQOJlB0&ab_channel=BigElkGarlicFarm), but stronger construction...
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    That is exactly what I hope to achieve with zinc...

    That is exactly what I hope to achieve with zinc plating. The part of the cutting knife that is in the ground gets polished(originally also zinced), the other half remains coated with zinc. Now the...
  22. should I grind off the thin surface rust or just apply rust converter?

    Hello everyone!


    This is my first time spray painting steel. My plan is to use wipe the implement with a thinner, spray rust converter, use a two component primer followed by two component enamel...
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    Thanks to everyone for commenting. It is for...

    Thanks to everyone for commenting.

    It is for looks. I expect it would be easier to market the tool if it looks good. Paint or zinc on cutting knives, either is going to get abraded in soil. Is...
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    preparing metal for zinc electroplating

    Hello everyone!

    I've made a tractor implement to assist me with picking up onions and root crops, similar to this one: https://www.youtube.com/watch?v=xAZrUAG3PcE

    I was thinking of painting the...
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    optimal weld geometry for tractor implement

    Hello everyone!


    I am making an undercutter/bed lifter tractor attachment. The goal is to slide a slanted board 10-12inch (25-30cm) deep into the ground and lift the soil just enough, so that you...
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    optimal weld geometry for tractor implement

    Hello everyone!

    I am making an undercutter/bed lifter tractor attachment. The goal is to slide a slanted board 10-12inch (25-30cm) deep into the ground and lift the soil just enough, so that you...
  27. undercutter / bed lifter - how thick and which steel to use?

    Hello everyone!


    I am planning to build an undercutter/bed lifter tractor attachment. The goal is to slide a slanted board 10-12inch (25-30cm) deep into the ground and lift the soil just enough,...
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