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Lab talk, the good, the bad, and the ugly
Dental-CAM
Coritec 250i vs Arum 5x-300 for small lab
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<blockquote data-quote="brayks" data-source="post: 305134" data-attributes="member: 11275"><p>I am guessing from your reference to spending pounds sterling as opposed to dollars, you are located in the UK. </p><p>I am not sure how the 5X300 machines are marketed in the UK but in the US the price of a "wet/dry" 5X400 and "wet/dry 5X300" is the same.</p><p></p><p>The 5X400 utilized NEMA 23 motors while the 5X300 utilizes NEMA 17 motors. While not always the case (and not going into the gory deails),the NEMA 23 motors on the 5X400 are capable of delivering more torque and are a bit faster than the 5X300 resulting in higher quality restoations and faster cycle times.</p><p>I wouldn't necessarily say the 300 is less suitable than the 400 for milling e.max however e.max does require more torque from the spindle motor and the drive system which may or may not cause the motor to miss steps during machining. </p><p></p><p>Although both machines run in closed-loop drive system, the missed steps are sensed and accounted for to address accuracy issues, the cutter associated load changes can cause changes in stock to be machined, which introduces <a href="https://www.axsysdental.com/documents/CNC%20Machine%20Vibration.pdf" target="_blank">vibration/chatter</a> resulting in lower quality restorations.</p><p></p><p>So for the basically the same price, I believe the 400 is a better choice as it reduces the aforementiond issues and does provide you with the opportunity to expand to cutting abutments should your business change over the next few years and you have a desire to machine abutments.</p></blockquote><p></p>
[QUOTE="brayks, post: 305134, member: 11275"] I am guessing from your reference to spending pounds sterling as opposed to dollars, you are located in the UK. I am not sure how the 5X300 machines are marketed in the UK but in the US the price of a "wet/dry" 5X400 and "wet/dry 5X300" is the same. The 5X400 utilized NEMA 23 motors while the 5X300 utilizes NEMA 17 motors. While not always the case (and not going into the gory deails),the NEMA 23 motors on the 5X400 are capable of delivering more torque and are a bit faster than the 5X300 resulting in higher quality restoations and faster cycle times. I wouldn't necessarily say the 300 is less suitable than the 400 for milling e.max however e.max does require more torque from the spindle motor and the drive system which may or may not cause the motor to miss steps during machining. Although both machines run in closed-loop drive system, the missed steps are sensed and accounted for to address accuracy issues, the cutter associated load changes can cause changes in stock to be machined, which introduces [URL='https://www.axsysdental.com/documents/CNC%20Machine%20Vibration.pdf']vibration/chatter[/URL] resulting in lower quality restorations. So for the basically the same price, I believe the 400 is a better choice as it reduces the aforementiond issues and does provide you with the opportunity to expand to cutting abutments should your business change over the next few years and you have a desire to machine abutments. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Dental-CAM
Coritec 250i vs Arum 5x-300 for small lab
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