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    CNC boat kits...?
    by DodgyGeezer πŸ‡¬πŸ‡§ ( Sub-Lieutenant)
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    redpmg
    Warrant Officer
    πŸ“ CNC boat kits...?
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    Country: πŸ‡ΏπŸ‡¦ South Africa
    Online: 2 hours ago
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    Easiest way to prevent parts falling out is use the same method as Billings Boats. At reasonable points you leave about 1.5mm gap in the cutline . Simple to cut through afterwards and will work for both CNC Laser & Router cutting.
    Not really required for larger parts - unless you are into commercial kit manufacture - just the parts likely to fall through the cutting bed or sucked away by the dust extractor.
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    DodgyGeezer
    Sub-Lieutenant
    πŸ“ CNC boat kits...?
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 5 hours ago
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    "...To prevent parts falling out,
    There is a low tack film sheet that airbrush painters users that you could stick to the under side of the wood...."

    There may well be. But it turns out to be easy to just specify a cutting depth which has exactly the same effect. I was surprised at how precise these machines can be.

    And I'm running off such archaic software that I would have to do tabs all manually - a lot of work....
    2
    Nickthesteam
    Petty Officer 1st Class
    πŸ“ CNC boat kits...?
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 14 days ago
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    Also tell the cam software to leave tabs to hold parts in the parent stock......
    If it don't fit, use a hammer to make it fit....
    Martin555
    Commander
    πŸ“ CNC boat kits...?
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 25 minutes ago
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    To prevent parts falling out,
    There is a low tack film sheet that airbrush painters users that you could stick to the under side of the wood.
    I don't know if it is expensive.
    Or maybe some low tack masking tape.

    Martin.
    If it looks right it probably is.
    DodgyGeezer
    Sub-Lieutenant
    πŸ“ CNC boat kits...?
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    Country: πŸ‡¬πŸ‡§ United Kingdom
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    A strong magnet would work - but in fact I have found that:

    - cutting 1/16" and 1/8" balsa sheet
    - using a 0.5mm cutting tool and a 12v boat motor

    the sideways cutting forces are sufficiently small for a simple raised lip around the cutting table to hold the sheet in place.

    One difficulty with passing round files of 'cutting instructions' to people so that they can create their own kits is that the cutting machines are all different. They will all accept 'G-Code' of some kind, but that code effectively says things like 'Go to position 25"x2" and cut a circle radius 2 inches'. Now, if you have a machine that only has a 10" cutting bed, you can't do that. You have to reposition the part so that it fits onto your cutter. So I've passed a DXF file to Nick - this is a CNC file with the shapes drawn on it. He will have to take each shape and position it on his machine where he want to cut.

    I have designed my machine to be able to take a standard sheet of 4"x36" balsa, because I expect to do most of my cutting that way. If other people have cutting beds which can do this, i can pass them cutting files directly.

    Another difficulty with cutting everything out of a single sheet is that one part may fall out of the sheet while cutting is going on in another part of the sheet. The best way I have found to avoid this is to not cut completely through the balsa sheet - leave a small gap of about 5 thou. Then you can easily push the shapes out later...
    2
    Martin555
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    πŸ“ CNC boat kits...?
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    Country: πŸ‡¬πŸ‡§ United Kingdom
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    Hi DodgyGeezer,
    I have been reading through this log and it reminded me that when I was a surface mount operator we used to use magnetic pillars and magnetic rubber strips to hold PCB's in place.
    Have you tried magnets?

    Martin.
    If it looks right it probably is.
    DodgyGeezer
    Sub-Lieutenant
    πŸ“ CNC boat kits...?
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 5 hours ago
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    "...I suppose depending on the cutting head you will be able to cut thin sheet plastic?...."

    The basic machine is just a precise 3-D positioning device. You then tie anything you want onto the end, depending on the job you want to do. A router or a laser will cut wood, a milling bit will cut metal, a knife will cut vinyl or paper. A plastic extrusion head will let you build up plastic shapes, a pen would let you write letters, and I suppose a paint brush would let you create watercolours...

    For every material there is a workholding requirement, and a set-up and run optimisation process to undertake, but the principle is simple.
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    Martin555
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    πŸ“ CNC boat kits...?
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    Country: πŸ‡¬πŸ‡§ United Kingdom
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    Very good idea, If you do Get someone to listen the next excuse will be health and safety!

    Martin.
    1
    If it looks right it probably is.
    Nickthesteam
    Petty Officer 1st Class
    πŸ“ CNC boat kits...?
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 14 days ago
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    I have cut plastic, acrylic wood and aluminium so far without problem. It is all down to cutter speed, feed rate and depth of cut, the same as with any power tool....
    1
    If it don't fit, use a hammer to make it fit....
    Nickthesteam
    Petty Officer 1st Class
    πŸ“ CNC boat kits...?
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 14 days ago
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    I have been pestering our local council to utilise empty parts of buildings as a makerspace but so far my pleas have fallen on deaf ears. No money available being the main excuse.....
    1
    If it don't fit, use a hammer to make it fit....
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