ATI Damper Dimension needed
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(3x 120° on a 3.200" bolt circle is more accurate)
Miata ATI may be different???
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Thanks again everyone.
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1. Make the corner radius between the mandrel and the flange as large as you can
2. Make the flange contact the mounting face all around. Getting rid of your scallop cuts completely would be the stiffest but won't look as cool.
3. Add a boss to the back side that locates on the ID of the damper. This will be more accurate than relying on the 3 bolts to center your mandrel on the crank. It's hard to see from your screenshot but it looks like you may have this already.
You many not think you have much static tension on that belt (bending moment on your mandrel) but harmonics are a surprising.
#9
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Good to know, I'm glad you went to the source for accurate info.
Nice. ATI sells mandrels but it's easy to spin off your own that precisely fits your application. My $0.02:
1. Make the corner radius between the mandrel and the flange as large as you can
2. Make the flange contact the mounting face all around. Getting rid of your scallop cuts completely would be the stiffest but won't look as cool.
3. Add a boss to the back side that locates on the ID of the damper. This will be more accurate than relying on the 3 bolts to center your mandrel on the crank. It's hard to see from your screenshot but it looks like you may have this already.
You many not think you have much static tension on that belt (bending moment on your mandrel) but harmonics are a surprising.
Nice. ATI sells mandrels but it's easy to spin off your own that precisely fits your application. My $0.02:
1. Make the corner radius between the mandrel and the flange as large as you can
2. Make the flange contact the mounting face all around. Getting rid of your scallop cuts completely would be the stiffest but won't look as cool.
3. Add a boss to the back side that locates on the ID of the damper. This will be more accurate than relying on the 3 bolts to center your mandrel on the crank. It's hard to see from your screenshot but it looks like you may have this already.
You many not think you have much static tension on that belt (bending moment on your mandrel) but harmonics are a surprising.
I do have a shoulder on the backside to keep it concentric, it's just hard to see like you say.
One thing I could do to really improve the stiffness is to machine the pulley ID from 1/2" to say, 3/4" or so. Then I could do a larger diameter shaft on the mandrel which would be way stiffer. Thoughts?
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