| ITEM |
DRITRAN |
BALL NUT |
CHAIN |
BELT |
RACK |
PNEUMATIC
or HYDRAULIC CYLINDERS |
| Downtime Risk |
Minimal: Nut Wears At a Predictable Rate |
Unpredictable & Screw Fails |
Highest: (Wear, Stretching) |
Medium: (Wear, Stretching) |
Low: (More Suseptable Harsh Environments) |
Medium: Leaks Seal Failures |
| Mean Time To Repair |
Minimal: (Typically Less Than 1 Hour) |
Days, Generally Must Order Complete Drive System (Not In
Stock) |
Low: (Typically Less Than 8 Hours) |
Low: (Typically Less Than 4 Hours) |
Days, Must Generally Order Rack & Pinion |
Low: Typically Less Than 4 Hours |
| Cost To Repair |
Minimal: (Nut In Inventory, Nut Recastable, New Screw Not
Required) |
High: (Need At Least Nut & Screw) |
Low: (New Parts Required) |
Low: (New Parts Required) |
High: (New Parts Required) |
Medium: New Parts Required |
| Speed |
High: Leads Exceed Screw Diameter By Over 200% |
Medium: Lead Generally Limited To Screw Diameter |
Low-Medium |
Medium |
Medium-High |
Medium |
| Index Distance |
Greatest Using Standoffs & Multiple Segments & Screws |
Limited To The Length Of One Screw |
High |
High |
High |
Limited To Stroke Length |
| Efficiency |
Medium (~80%) |
High (~95%) |
Low (~50%) |
Low (~50%) |
Medium (~70%) |
Medium: (Approx 70%) |
| Yearly Repair Cost |
Low & Predictable |
Unknown & Unpredictable |
Unknown & Unpredictable |
Unknown & Unpredictable |
Unknown & Unpredictable |
Unknown & Unpredictable |
| Accuracy |
High |
Highest |
Low (Stretch Issues) |
Low (Stretch Issues) |
High |
Medium |
| Noise |
Lowest: Especially At High Speed |
Medium-High |
Medium |
Medium |
Medium-High |
Medium |
| Vibration |
Low |
Medium |
High |
High |
Medium |
Medium |
| Risk To Failure Due To Contamination |
Low |
High |
Low |
Medium |
Medium-High |
Low-Medium |
| Predictable Failure |
Yes |
Yes |
Maybe |
Maybe |
Yes |
Maybe |
| Lubrication |
Recommended, But Absence Will Not Cause Catastrophic Failure |
Yes, Absence Can Cause Catastrophic Failure |
Yes, Absence Can Cause Catastrophic Failure |
No |
Yes, Absence Can Cause Catastrophic Failure |
N/A |
| Propensity To Stretch |
Minimal |
Minimal |
High |
High |
Minimal |
N/A |
| Ability Of Drive System To Run Production
With Damaged Components |
High: Will Generally Run With Damaged Screw |
Low |
Low |
Low |
Low |
Low |
| Failure Resulting From Crash |
Easily Repaired In 1 Hour Or Less |
Several Hours Downtime |
Repaired In 4 Hours Or Less |
Several Hours Downtime |
Several Hours Donwtime |
Repaired In 4 Hours Or Less |
| Yearly Maintenance Costs |
Low |
High |
Medium |
Medium |
High |
Medium |
| Overall Return On Investment |
High |
Low |
Medium |
Medium |
Low |
Medium |
| SUMMARY |
| Load Capacity At High Speed & Long Lengths |
High |
Low |
Low |
Low |
Medium |
Low |
| Overall Cost When Considering Initial Investment,
Repair Costs, Lubrication Costs, & Downtime/Loss Production
Costs |
Low |
High |
Medium |
Medium |
High |
Medium |
