Specifications Overview:
The document provides a detailed comparison of various cylindrical grinders models including GM, GM8, GM12, GM20, GM25, GM32, GMP, GM8P, GM12P, GM20P, GA, GA8, GA12, GA20, GMH, and GM25H. Key specifications include maximum grinding diameter, distance between centers, swing over table, maximum workpiece weight, wheelhead details, grinding wheel speed, rapid approach, infeed handwheel increment, motor power, and variable speed options.

Grinding Capacity:
- Max Grinding Diameter: Ranges from 8" (200mm) to 31.49" (800mm) depending on the model.
- Distance Between Centers: Varies from 19.68" (500mm) to 196.8" (5000mm).

Workpiece Handling:
- Swing Over Table: Ranges from 10.23" (260mm) to 38.97" (990mm).
- Max Workpiece Weight: From 110lbs (50kg) to 6618lbs (3000kg).

Wheelhead and Grinding Wheel:
- Wheel Size: Varies from 16" x 2" x 7.992" to 36" x 3" x 12".
- Max Surface Speed: Consistent at 6889 sfpm (35m/S) for most models.

Motor and Speed:
- Motor Power: Ranges from 5.36hp (4 kw) to 26.8hp (20 kw).
- Variable Speed: Options range from 300~750rpm to 800~1600rpm.

Workhead and Tailstock:
- Spindle Type: Dead spindle across all models.
- Bore Taper: Varies from Morse #4 to ISO 80.
- Quill Travel: Ranges from 1.18" (30mm) to 2.75" (70mm).