Learner Les":2ivcb3pb said:
I think that the BK1 is a single (low) speed machine. Where does the belt fit for the lower speed on your BK2 ? Does it fit around the blade pully ? If so then it must run either under or alongside the blade !
Here's some photos which should make everything clear (OK, perhaps not, but it should give you a good start!
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OK the basic setup...
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Removing the screw on the wheel showed the gear was an integral moulded part.
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The cog/pulley is held on by a small screw. Please ignore the state of my screwdriver - it's my "Paint-stirrer" - I couldn't find anything I needed as A) It was late when I took these pics, and B) My workshop is full of nuerous deliveries at the moment.
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Just a general picture...
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and another....
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It's not very clear but there is a metal "pin" going through to stop the pulley slipping.
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Might be slightly easier to see in this picture...
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More pictures...
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So if you can't get the parts - and are making it yourself, heres a few bits to help.....
Diameter of the cog = approx 35mm
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With a vernier...
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Motor pulley, outside flange (28mm?)
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And internally, measured on vernier, actual cog diamter
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A guess at the frequency of the teeth
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I reckon thats 10 notches and spacings = ~5mm each? (0.2"?). I'll let you decide/check!
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The teeth are not square, each side is "sloped" they are about 2.27mm at the base
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And at the top...
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Hope that helps, it makes a bit more sense if you click the link above the belt manufacturer. All these measurements are a bit "ropey" in so much as it's quite hard to accurately measure rubber belts!
I'll look up the part numbers in RS of the similar parts I have bought previously.
I'll also send you the link to the directories which I have all the pictures in, in case you want to view the ones I missed out this post....
Hope that helps...
Adam