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  1. Thread: Dx5e?

    by bigsi
    Replies
    9
    Views
    3,946

    Another thing you might consider is known as...

    Another thing you might consider is known as 'Single Stick'
    http://www.hobbyking.co.uk/hobbyking/store/__80303__Quanum_Single_Stick_3_Axis_Gimbal_Upgrade_for_Turnigy_9XR_9XRPro_Tx_39_s.html
    Which...
  2. Thread: Where to Build?

    by bigsi
    Replies
    8
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    3,184

    Barber-ous I was built in the dining room of my...

    Barber-ous I was built in the dining room of my old house. All the bits were laser cut & bolted together with no welding. It all went fine until during testing, it fell off it's stand, shredded the...
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    Let me share an alternative with you. This...

    Let me share an alternative with you. This arrangement is known by several names, including a 'cannon valve' as they are often used in Potato Cannons!


    It's made from two concentric tubes. The...
  4. Replies
    24
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    7,690

    Let me share an alternative with you. This...

    Let me share an alternative with you. This arrangement is known by several names, including a 'cannon valve' as they are often used in Potato Cannons!
    ...
  5. Replies
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    7,690

    Your pneumatics have to develop more force than...

    Your pneumatics have to develop more force than the spring to be able to compress it - so there must be an argument for just using the pneumatics and not bothering with the spring!

    Si
  6. Replies
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    133,165

    Between 400 & 600psi typically. Depends a lot on...

    Between 400 & 600psi typically. Depends a lot on temperature and type of bottle. The smooth walled bottles perform better than faceted (like coke bottles).

    When they blow, they make a loud bang...
  7. Replies
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    8,775

    I take back what I said about this series...

    I take back what I said about this series compared to the old RW's - that was a complete fix!

    Pulsar was undoubtedly a good, innovative robot but to be allowed back in after the first round,...
  8. Replies
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    6,119

    Wood turns up in some very surprising & unlikely...

    Wood turns up in some very surprising & unlikely places industrially for armour, insulation, wear resistance, flexibility and sheer strength. A good example is the skid on the tail of commercial...
  9. Replies
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    3,730

    I really like GRBL! I've used it with the...

    I really like GRBL! I've used it with the Synthetos Shield on a commercial project. The NC Controller needed to be embedded - and it worked perfectly!

    Si
  10. Replies
    13
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    3,730

    There's nothing wrong with a Parallel port...

    There's nothing wrong with a Parallel port controller. My lathe uses a Parallel port. The mill uses both the Parallel port and a Smoothstepper Ethernet controller and the Plasma is USB.

    Be...
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    3,730

    http://www.ebay.co.uk/itm/Denford-Novamill-CNC-Mil...

    http://www.ebay.co.uk/itm/Denford-Novamill-CNC-Milling-Machine-/252498878656?hash=item3aca1b20c0:g:7dAAAOSwHoFXrwLU
    ...
  12. Replies
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    3,730

    OK then, my advice would not be to buy any of the...

    OK then, my advice would not be to buy any of the Chinese machines. By the time you've 'fixed' the problems with it, you'll likely wish you hadn't

    Look for an old Emco or Denford desktop CNC. ...
  13. Replies
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    2,962

    I'm really not trying to pick a bun fight with...

    I'm really not trying to pick a bun fight with you.

    I'm sure you and the 'dream team' are more knowledgeable about this than me.
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    Were this universally the case, you would expect...

    Were this universally the case, you would expect vehicles with balistic protection to fall apart under fire. It is more difficult to weld and form than Steel, but actually very similar to Hardox of...
  15. Replies
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    Why don't the two of you find local Maker-spaces?...

    Why don't the two of you find local Maker-spaces? There you will likely have access to Machining, CNC & printing - but with people who will take you through the basics and give useful advice on what...
  16. What gate drive current / gate capacitance can...

    What gate drive current / gate capacitance can they cope with? With the idea of using higher rated FET's

    They look good though! Anything open-source is a big plus.

    Si
  17. Brushless DC Speed Controllers for Heavyweights

    I've used a few Roboteq controllers for industrial applications - mostly VBL2360's, but they are rather expensive at £700 or so for a 2 channel, 60A continuous rating. They also only operate in...
  18. Replies
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    7,690

    The latent heat of vaporisation of CO2 is...

    The latent heat of vaporisation of CO2 is 574kJ/kg the energy density of a typical LiPo is about 500kJ/kg - so not much to call it.
    Unfortunately you need a container for the CO2, which for the...
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    2,962

    Excuse me? Our drum was made from 10mm thick...

    Excuse me?
    Our drum was made from 10mm thick HDPE. Although it took some cosmetic damage, it was only actually pierced once and then only a 5mm hole.

    As someone else pointed out, if it is...
  20. Replies
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    I might be interested! What sort of money are...

    I might be interested! What sort of money are you looking for?

    Do you know which sub-model the 170mm motors are:
    http://lynchmotors.co.uk/pdfs/lmc-lem-170.pdf

    Si
  21. Replies
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    I like the idea of a flush mounting link. In the...

    I like the idea of a flush mounting link. In the olden days however, we were told the link had to be removable with a 'bill hook' (a hook on a pole). If this is not still a requirement - definitely...
  22. Replies
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    eBay Hub Motors - might be useful?

    http://www.ebay.co.uk/itm/Balance-board-Hover-board-or-Air-Wheel-Motor-6-5-/142068188473?hash=item2113ec8539:g:pMQAAOSwbsBXmeyE

    Nothing to do with me - other than having bought a pair (He accepted...
  23. Replies
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    [R9000] - Thanks :-) I agree with a...

    [R9000] - Thanks :-)



    I agree with a reasonable amount of what you say here - except what you say about Armour! (I know a little about Balistic protection!). In the real world, you never see...
  24. Replies
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    If it's of any interest, I have a pair of IFI VEX...

    If it's of any interest, I have a pair of IFI VEX Pro Victor 883 controllers which have been gathering dust. I last used them on a DIY Segway a couple of years ago....
  25. Thread: Speed Controller

    by bigsi
    Replies
    9
    Views
    3,252

    Nope! You can of course reverse with Relays -...

    Nope!

    You can of course reverse with Relays - but it's more messy.

    I like 4QD Controllers - and have used a lot over the years. Granted they are also 0-5v input, but it's not hard to convert...
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