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Frequently Asked Questions
Q. What happens the further my drive force/center of gravity gets from the fixed bearing side?
A. The greater the required drive force will be. The higher the wear will be in the system, the lower the max velocity.
The increase in wear will lead to less accuracy over time.
Q. What if I use a larger motor/drive force, can I overcome the 2:1 Rule?
A. No, a larger moment will not overcome the friction-force and the system will not move properly. Essentially the
more force you try to move it with, the greater the moment and friction-force becomes. The best thing to do is
spread the bearings further apart on the fixed rail.
Q. What if I use all fixed bearings or all floating bearings?
A. You have over-defined the system. Your 2:1 ratio should now be calculated from the acting force to the rail
furthest away. You will need a higher drive force to move the system. You may see binding or chattering. There will
be increased wear. The max permissible velocity will be reduced. The system will not be as accurate over time as it
would if you used fixed and floating bearings.
drylin
®
W - Floating systems
Maximum Float 0.08" (2 mm)
drylin
®
T - Floating systems
Maximum Float 0.04" (1 mm)
drylin
®
N - Floating systems
Maximum Float 0.02" (.5 mm)
Standard version Horizontal float "LLZ" Vertical float "LLY"
Standard version Horizontal float "LLZ" Vertical float "LLY"
Standard version Horizontal float "LLZ" Vertical float "LLY"
Ability to alleviate edge pressure;
ideal for non-flat surfaces
