It is dynamically balanced to 20,000RPM at G2.5 by Haimer balancing machine at all location for consistent balance. The unique design in the flange minimizes the off-balance nature of BT 40 taper specification. On the side of flange where a half spherical hole is located, a "wall" is built around this hole to compensate the weight of the metal chips lost from forming this spherical hole. This design allows the left side and right side of the holder to achieve 50-50 perfect weight distribution in its upright position, like the position inside a machine spindle. Symmetrical design in evenly weight distribution will minimize centrifugal force in high speed spinning and thus maximize the holder's ability to hold the cutting tool concentric to spindle rotation.
Taper ground AT3 or better accuracy standard is for maximum contact with spindle. All critical surface are precision ground.
Concentricity is less than 0.0001 from taper O. Each holder comes with a lab certificate on its taper accuracy and runout measurement on its taper accuracy and runout measurement.The thread select grinding process obtains the better interchangeability. Internal set screw is included and can be used as a stopping pin to prevent end mill or drill from sliding backwards while performing heavy cutting. The CAT40 CAT50 BT30 BT40 7:24 taper is inspected on production line by Stotz Air/Electronic instrument to ensure AT3 or better taper contact. 4 PCS BT40 - ER20 collet chucks with. Gage length: 2.75----4 pcs. PRODUCED ACCORDING TO AT3 SPECIFICATIONS.
Alloy steel hardened to 50-52 rc. Works on all BT40 machines. Collet chuck accepts all ER20 collets. Coolant flows through tool holder.
70mm Gage Length, Hex Nut (included). Balanced to 25,000 RPM at G2.5. 0.0001 runout from taper to pocket. Taper ground to AT3 standard. Concentricity/runout less than: 0.0001/0.003mm.0.0001 / 0.003mm. 0.00015 (0.004 mm). We believe that it is our vision and mission to provide innovative products with best service and competitive price to satisfy you. Our goal is to make sure that you can find exactly what you are looking for and make it easy for you to place your orders. California Warehouse: City of Industry, CA. If you need to return, please check twice to confirm the item not work and contact our customer service representative, let us know the detailed problem and send us some pictures for confirmation. Please make sure that item has NO man-made sabotage. Used items will not be accepted for return. All emails will be responded to within. Special circumstances will be listed clearly in the listing. Please do check everything carefully after you received the parcel, any the damage except DOA (Dead-On-Arrival) would not be covered if it's your fault.
A: The item ships from Rancho Cucamonga, CA, United States. A: Please log on your account. Q: How do I return an item? Please contact our customer service before you return an item. The item "4Pcs BT40 ER20 Collet Chuck 2.75 20,000RPM Tool Holder Set Top High Milling" is in sale since Tuesday, September 17, 2019.
This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Toolholding\Other Toolholding". The seller is "ganfeii1_4" and is located in Rowland Heights, California. This item can be shipped worldwide.