catalytic
Cast Iron
- Joined
- Feb 4, 2010
- Location
- Boston, Los Angeles, and Cleveland
I've chased the vibration in a 20" upright bandsaw to the belt & pulleys. I have three questions:
1. How much radial & axial runout is acceptable on machine pulleys in order to get the machine to pass the nickel test? Belt design books suggest the following:
Radial Runout Guideline:
Up through 10" Outside Diameter = 0.010"
For each additional inch = + 0.0005"
Axial Runout Guideline:
Up through 5" Outside Diameter = 0.005"
For each additional inch = + 0.001"
However, it is unclear to me whether pulleys that fall within these guidelines will have imperceptible vibration, or whether this is still the main source of my vibration problem.
My 4" motor pulley measures 0.003 radial & 0.002 axial. Balance not checked.
My 8.5" lower wheel pulley measures 0.005 radial and 0.006 axial. This pulley is balanced.
2. If this runout is an issue, do you guys recommend having them trued up in a shop & balanced, or just get new pulleys?
3. What belt would you recommend to mitigate vibration? I would prefer to avoid link & powertwist belts. I have heard that a Gates cogged belt may be the ticket, but I haven't tried one.
Thanks,
Adam
1. How much radial & axial runout is acceptable on machine pulleys in order to get the machine to pass the nickel test? Belt design books suggest the following:
Radial Runout Guideline:
Up through 10" Outside Diameter = 0.010"
For each additional inch = + 0.0005"
Axial Runout Guideline:
Up through 5" Outside Diameter = 0.005"
For each additional inch = + 0.001"
However, it is unclear to me whether pulleys that fall within these guidelines will have imperceptible vibration, or whether this is still the main source of my vibration problem.
My 4" motor pulley measures 0.003 radial & 0.002 axial. Balance not checked.
My 8.5" lower wheel pulley measures 0.005 radial and 0.006 axial. This pulley is balanced.
2. If this runout is an issue, do you guys recommend having them trued up in a shop & balanced, or just get new pulleys?
3. What belt would you recommend to mitigate vibration? I would prefer to avoid link & powertwist belts. I have heard that a Gates cogged belt may be the ticket, but I haven't tried one.
Thanks,
Adam