Quick Change Tool Posts, Two Styles - Piston and Wedge Both are precision engineered to assure repetitive accuracy. Advanced design provides built-in quick tool changing versatility with positive rigidity to meet the most exacting tolerances. Quickly and easily installed on an engine, bench, or turret lathe for a wide range of operations, from fine precise work to heavy-duty cutting. Piston type posts are economical, while the Wedge type posts are clearly ultra-precise. Both accept the tool holders and interchange with Aloris,Dorian, and DTM Tooling. Made of Steel Piston Style Item Model A B C D E H R Swing Code L W H1 M 0250-0100 AXA 2-1/2" 3-7/8" 2-1/4" 9/16" 1-7/16" 4-11/16" 5-3/4" 6-12" I 1.850" 2.362" 0.472" M14x1.5 0250-0200 BXA 3" 4-5/8" 2-3/4" 5/8" 1-5/8" 5-9/16" 7-5/16" 10-15" I 2.756" 2.500" 0.630" M16x1.5 0250-0300 CXA 3-3/8" 5-1/8" 3" 3/4" 1-7/8" 6-1/8" 7-7/8" 13-18" I 2.992" 2.992" 0.748" M20x2 0250-0400 CA 4" 6-1/4" 3-5/8" 7/8" 2-1/8" 7" 9" 14-20" I 3.937" 2.992" 0.984" M22x2 Wedge Style Item Model A B C D E H R Swing Code L W H1 M 0250-0111 AXA 2-1/2" 3-7/8" 2-1/4" 9/16" 1-3/8" 4-11/16" 5-3/4" 6-12" I 2.500" 2.244" 0.500" 9/16"-18UNF 0250-0222 BXA 3" 4-5/8" 2-3/4" 5/8" 1-9/16" 5-9/16" 7-5/16" 10-15" I 2.992" 2.756" 0.630" 5/8"-18UNF 0250-0333 CXA 3-1/2" 5-1/8" 3" 3/4" 1-29/32" 6-1/8" 7-7/8" 13-18" I 3.504" 2.992" 0.748" 3/4"-16UNF 0250-0444 CA 4" 6-1/4" 3-5/8" 7/8" 2-1/8" 7" 9" 14-20" I 3.937" 3.622" 0.984" 7/8"-14UNF The difference between wedge style and piston style quick change tool posts lies in their mechanism for holding and locking tools into place on a lathe. Both types are designed to change tools on a lathe quickly and easily without the need to re-zero the tool position each time. Here are the key differences: Wedge Style QCTP Mechanism: Utilizes a wedge mechanism that, when tightened, forces a wedge upward, creating a very tight and secure fit between the tool post and the tool holder. Precision and Rigidity: Generally provides superior clamping force and rigidity, leading to better machining accuracy and the ability to handle heavier cuts. Cost: Typically more expensive than piston style due to its precision and the quality of machining it can handle. Piston Style QCTP Mechanism: Uses a piston mechanism where a piston expands outward to lock the tool holder in place when the handle is tightened. Flexibility and Ease of Use: Often considered easier to use for quick changes, but may not provide as tight a grip as the wedge style, making it less suitable for very heavy or high-precision machining. Cost: Generally less expensive than the wedge style, making it a popular choice for hobbyists or operations where extreme precision is not as critical. The choice between a Wedge and Piston style tool post depends on your specific needs: If you require high precision and are working with heavy cuts, a Wedge style may be more suitable. If cost is a more significant concern and you're looking for ease of use for more general machining tasks, a piston style might be the better choice.
