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Mike2

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Posts posted by Mike2

  1. Holding Down Circuit

    in Electronics chit chat

    Posted

    I have a circuit which I want to hold down on a MDF base, I was thinking of using small nails/tacs however I can't find any suitable to fit in the holes on the circuit board, so does anyone have any other suggestions, I don't want to glue it down in case I needed to replace a part etc...

    Thanks

  12. Latching Device

    in Mechanical constructions/Hardware

    Posted

    Ok, I have worked out how it will work and the simple circuit it will run off, will the Micro Switch be used as the push to break trigger for when the shade has been pulled out?

    I have sourced them here, though am unsure if they are the correct ones from the choice, which ones should I have picked?

    Latching Relay:  http://www.maplin.co.uk/module.aspx?ModuleNo=37529&doy=5m3#overview
    Micro Switch:   http://www.maplin.co.uk/Module.aspx?TabID=1&ModuleNo=6452&doy=5m3

    I am looking at running the circuit off 3V, and may incorporate an IR remote. (Ambitious I know)

  13. Latching Device

    in Mechanical constructions/Hardware

    Posted

    Hmmm Ok, the problem is when the shade is pulled out, a pulley on the motor will be wound up with fishing wire, now then when I want to roll the shade up, the motor will have to pull the shade back, as well as pulling against the force of the other motor to unwind it? Is there another way to do it?

    Also whats the best way to shut off power to the motors once the shade has been pulled out as far as needed, or rolled up? I was thinking something like a push to break switch, however once the shade goes back and releases the push to break switch it may cause some problems...?

    Sorry for all the questions, but I'm a bit of a novice with electronics and having problems imagining how it would work.

  15. Latching Device

    in Mechanical constructions/Hardware

    Posted

    Thanks for your responses.

    I will be using a roller shade / blind type device pulling it out horizontally. I want to use a motor to pull the shade out, once pulled out I want the motor to stop, and the shade is held in place. This is done by turning it on. Turning it off, or the switch the other way, the shade is pulled back and rolled up using a or the same motor.

    This is an image to show what I mean: scan10001rd6.th.jpg

    I want it to be all automatic, all the users does is flick a switch. I was going to use fishing string for it. the motor I am currently using to test is a simple motor which rotates in either direction depending on how the positive and negatives are connected, it doesn't have self-inhibited gear, so it can be rotated with out power manually.

    Do I need two motors to make it pull out and roll up? How can I make it switch off when the shade is puled out upto the pulley (The shade can be set to work with different lengths, eg how far it comes out)?

    Thanks

  17. Latching Device

    in Mechanical constructions/Hardware

    Posted

    I have a motor that pulls out a car sun shade, however once it is pulled down I need it to latch onto a hook or something to hold it down, and then the motor can shut off saving on power.

    The problem is getting the latch/hook to fold down to allow the shade to roll back up, there shouldn't be any manual use so it would be done electronically, any ideas though on how to do it?

    Thanks Mike

  20. Motor

    in Inventive/New Ideas

    Posted

    Hi, thanks for your responses.

    The diameter is 10mm (1CM), and it takes a weight of 624grams to pull the shade down 40cm.

    Is it possible to work the torque required from this information?

    These are the motors I have been looking at: http://www.maplin.co.uk/module.aspx?TabID=1&criteria=motor&ModuleNo=43357&doy=21m12

    Thanks.

  22. Motor

    in Inventive/New Ideas

    Posted

    Hi

    I am looking to buy a small motor but am unsure at the amount of torque that is needed. I am looking to use the motor to be able to pull down a car sun roller blind.

    Example:
    http://www.halfords.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10001&langId=-1&catalogId=10151&productId=174246&categoryId=52216

    If possible could you please advise me on a motor that may be suitable for this application or the range or torque that maybe needed?

    Thanks Mike

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