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Thread: belt tension

  1. #9
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    Default Re: belt tension

    sorry - it's 28 teeth i believe!

    hope this helps:)

  2. #10
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    Default Re: belt tension

    Hi Toby,



    Best way to get the duct as round as possible is unfortunately at the time of mounting it to the craft..... Although you may be able to use the flow straightners.



    What to do is get a piece of thick ply or chipboard. I use 18mm. Then cut a circle out of it the same radius as the inside radius of the duct. I used a router to get as round a circle as possible. With any luck it will be a snug push fit inside the duct. You can then tap it into place and square it up. This will force the duct into a round.



    If attaching the duct to the craft at this point then it should remain pretty much round when you take the disc out. You could try and hold it with your straightners though.



    The other advantage of this method is that you can drill a hole through the centre of the disc and this can be used to line your shaft up in the middle of the duct.



    Another way of keeping it round is to go back to your piece of wood and cut a ring out of it. The inside diameter of the ring should be the same as the outside diameter of the duct. The ring should be about 50mm wide. You then can glass this ring around the outside of the duct. Put it where the blades sweep as it gives it more strength in case of blade faliure.



    This will keep the duct round and make it so much stiffer. However it will look pretty ugly so it may be worth then putting a duct cover/cowl on to cover it all up.



    Hope this makes sense. Let me know if i need to do a little better at explaining it!



    Nick

  3. #11
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    Default Re: belt tension

    to try and get your duct a little rounder try cutting a disc of mdf or plywood the diameter of the duct where the blades run and make it so it's a push fit into the duct, also drill a hole so it fits your fan shaft, relax the bolts on your fan frame and wedge the disc in the duct



    once it's in, tighten your fan frame and then fibreglass a band of 4x1" thick foam around the duct so it makes a box section around the duct in line with the disc, this will stiffen the duct up and hopefully correct the ovalness, leave a good 48 hours before you remove the disc



    [img]index.php?t=getfile&id=893&private=0[/img]



    hope that makes sense



    Tony







    Attached Images Attached Images

  4. #12
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    Default Re: belt tension

    ok sounds good!



    hopefully tomorrow I'll have easy access to a cnc router so will do that.

  5. #13
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    Default Re: belt tension

    Great minds think alike, ha ha!!

  6. #14
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    Default Re: belt tension

    For H section pulley (tzr engine) what should be the degrees for belt tension ?

  7. #15
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    Default Re: belt tension

    As above. A 90 degree twist but no more.



    Nick

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