lead_screw_pitch_options_xystage
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documentation:lead_screw_pitch_options_xystage [2016/05/23 20:13] – vik | lead_screw_pitch_options_xystage [2019/04/18 19:34] – external edit 127.0.0.1 | ||
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+ | ====== Lead Screw Pitch Options for ASI XY Stages: Speed, Resolution, and Repeatability ====== | ||
+ | The following table shows tested (and expected in italics) specifications for different lead screws pitches, motor gear-head combinations and encoder types. | ||
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+ | ^ Standard Configuration using DC Servomotor with 141:1 Zero-Backlash Gearhead ^^^^^^^^^ | ||
+ | ^Lead Screw Pitch (mm) ^ Lead Screw Pitch Name ^ Max Speed(mm/s) ^512 Counts/Rev Rotary Encoder ^^^ Linear Encoder ^^^ | ||
+ | ^::: ^::: ^::: ^Encoder Resolution (nm) ^Typical RMS Bi-directional Repeatability <wrap lo>(with anti-backlash firmware)</ | ||
+ | |25.40 |Ultra-Coarse |28 |88 | < 3 µm |0.25 |10 |< | ||
+ | |12.70 |Super-Coarse |14 |44 | < 1.5 µm |0.25 |10 |< | ||
+ | ^6.35 ^Standard ^7 ^22 ^ < 0.7 µm ^0.25 ^10 ^ < 0.3 ^± 3 µm^ | ||
+ | ^1.59 ^Fine | ||
+ | |0.635 |Extra-Fine |0.7 |2.2 | < 0.5 µm |0.25 |10 |< | ||
+ | |0.317 |Ultra-Fine |0.35 |1.1 | < 0.5 µm |0.25 |10 |< | ||
+ | |||
+ | ^ Special Configuration using DC Servomotor with 3.71:1 Planetary Gearhead ^^^^^^^^^ | ||
+ | ^Lead Screw Pitch (mm) ^Lead Screw Pitch Name ^Max Speed(mm/ | ||
+ | ^::: ^::: ^::: ^Encoder Resolution(µm) ^Typical RMS Bi-directional Repeatability <wrap lo>(with anti-backlash firmware)</ | ||
+ | |25.40 |Ultra-Coarse |480 |3.3 |< | ||
+ | |12.70 |Super-Coarse |240 |1.7 |< | ||
+ | ^6.35 ^Standard ^120 ^0.84 ^< | ||
+ | |1.59 |Fine |30 |0.21 |< | ||
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+ | The full dynamic average speed range for ASI stages under closed loop velocity control is about a factor of 10, | ||
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+ | Limits of resolution are imposed by both the minimum encoder resolution (measurement resolution) and by the minimum achievable mechanical motion possible (mechanical resolution). | ||
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+ | In the standard configuration, | ||
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+ | For applications where speed of movement is an important factor, a different motor /gear-head combination is used. Mechanical backlash can be around 10 μm for these systems if linear encoders or anti-backlash controls are not used. | ||
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+ | The MS-2000 stage controller has the ability to automatically correct for most of the backlash present in the mechanical system. | ||
+ | |||
+ | Overall measurement accuracy depends upon the pitch accuracy of the lead screw if rotary encoders are used, or the accuracy of the optical scale if linear encoders are used. Linear encoders provide significant advantages when high positional accuracy is required. | ||
+ | |||
+ | {{tag> |
Address: 29391 W Enid Rd. Eugene, OR 97402, USA | Phone: +1 (541) 461-8181
lead_screw_pitch_options_xystage.txt · Last modified: 2023/11/13 14:42 by jon