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Lab talk, the good, the bad, and the ugly
Dental-CAM
Zirkon Zahn M1 wet heavy - for CoCr and Titan?
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<blockquote data-quote="zero_zero" data-source="post: 135302" data-attributes="member: 9932"><p>Gotta disagree with ya Luke...the only common thing between Al and Ti is light weight in comparison with steel...( Ti density is roughly double of Al's ). Machining wise they're totally different...while Al is soft and has a relatively high thermal conductivity, can be easily cut dry with high feed/plunge rates, practically any with tool type...even the DWX50 can do it (with proper strategies) <-- my own experience <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" />...</p><p>Cutting Ti on the other hand is like cutting stainless steel, only tougher since it's thermal conductivity is low...heavy flood cooling is necessary with special chlorine free fluids...</p><p>It's also subject to work hardening in contact with the tool along the cutting edge...the shearing angle is increased because there's no stationary mass ahead of the tool ( it doesn't build up like steel does) , resulting in high loads and localized heat (since it doesn't conduct heat away rapidly it tends to gall to the tool). It needs high torque at slow cutting speeds and constant high feed rates (cannot let the tool dwell, in contrast with other materials)...to keep heat formation at minimum. It has a lower modulus of elasticity than steel, it tends to deflect from tool pressure and cause chatter...that's why a heavy rigid rig is required to keep close tolerances...look at the desktop (metal capable) mill's products...they're all full with tool chatter... that's why they came out with premilled abutments...it is tough to cut an interface to the required tolerances...<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes :rolleyes:" loading="lazy" data-shortname=":rolleyes:" /></p><p>Cutting strategies also need to be setup accordingly...like plunge should be arced in vs. straight line (couldn't figure out how to do this with Sum3d...yet),needs climb milling vs. conventional feed, changing depth of cut at each pass, radial tool engagement should be kept under 40% ( in contrast Al can be cut at full slotting )...etc. etc. How do I know these ? Lately I became a regular at a local machine shop...figured that would be the best place to learn CNC before venturing into metal cutting...<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /> (hope I can keep up with the beer demand)</p><p></p><p></p><p></p><p>For the price point and demand is hard to beat the Haas...IMO</p></blockquote><p></p>
[QUOTE="zero_zero, post: 135302, member: 9932"] Gotta disagree with ya Luke...the only common thing between Al and Ti is light weight in comparison with steel...( Ti density is roughly double of Al's ). Machining wise they're totally different...while Al is soft and has a relatively high thermal conductivity, can be easily cut dry with high feed/plunge rates, practically any with tool type...even the DWX50 can do it (with proper strategies) <-- my own experience ;)... Cutting Ti on the other hand is like cutting stainless steel, only tougher since it's thermal conductivity is low...heavy flood cooling is necessary with special chlorine free fluids... It's also subject to work hardening in contact with the tool along the cutting edge...the shearing angle is increased because there's no stationary mass ahead of the tool ( it doesn't build up like steel does) , resulting in high loads and localized heat (since it doesn't conduct heat away rapidly it tends to gall to the tool). It needs high torque at slow cutting speeds and constant high feed rates (cannot let the tool dwell, in contrast with other materials)...to keep heat formation at minimum. It has a lower modulus of elasticity than steel, it tends to deflect from tool pressure and cause chatter...that's why a heavy rigid rig is required to keep close tolerances...look at the desktop (metal capable) mill's products...they're all full with tool chatter... that's why they came out with premilled abutments...it is tough to cut an interface to the required tolerances...:rolleyes: Cutting strategies also need to be setup accordingly...like plunge should be arced in vs. straight line (couldn't figure out how to do this with Sum3d...yet),needs climb milling vs. conventional feed, changing depth of cut at each pass, radial tool engagement should be kept under 40% ( in contrast Al can be cut at full slotting )...etc. etc. How do I know these ? Lately I became a regular at a local machine shop...figured that would be the best place to learn CNC before venturing into metal cutting...:D (hope I can keep up with the beer demand) For the price point and demand is hard to beat the Haas...IMO [/QUOTE]
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Lab talk, the good, the bad, and the ugly
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Zirkon Zahn M1 wet heavy - for CoCr and Titan?
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