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09-08-2011 #11
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09-08-2011 #12
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09-08-2011 #13
That's what I did for XL pulleys ... but then that's only a trapezium.
Small ball nose cutter and several passes to get the right profile? Would take ages but if it's a one off why not?
P.S. I've got some 3m HTD pulleys if you're interested... I'll go and check what sizes.
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09-08-2011 #14
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09-08-2011 #15
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09-08-2011 #16
The profile for 3m looks like this
What about to drill 12 holes 1.8 mm dia then turn it to proper outside size???? Eventually tweak corners a bit
Jonathan I have those pulleys, but I need something like shaft ending with a pulley on the end. The stock one are not any good, I tried:sad:
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09-08-2011 #17
That looks like the profile for the belt, not the pulley. There's generally a small difference.
I've seen pictures of it done by drilling, so I suppose it's worth a try. I can't think of any reason for the holes not to be accurate. I would use 1.9mm as you'll be a bit stuck if the cut-outs are too small and it does not fit.
You might be able to 'tweak' the corners well enough with a chamfer. Maybe put it in a lathe and spin whilst holding a piece of wet and dry to it.
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09-08-2011 #18
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10-08-2011 #19
I think I'll go for self center chuck and eventually in a future for independent jaws.
Thanks Jon for calculations to do pulley this way will save me hassle with producing a cutter. What's the program by the way????
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10-08-2011 #20
Pulley generated in Gearotic,
www.gearotic.com
Then saved as 2D DXF, brought into CAD and the two circles added and dimensioned.John S -
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