Re: [Emc-users] Servo motor watts VS torque?
2013/9/6 Gregg Eshelman > On Thu, 9/5/13, Sven Wesley wrote: > > ... > gantry weight around 80-90 kg and is driven by small Nidec > servos rated at 80 V (really small). > > > That's not even 200 pounds. The table on this mill is 10x50" - 25.4x127 > centimeters, 4" - 10cm at its thickest, of cast iron, plus the saddle. > That's a lot of weight to move, which I'm not in the least interested in > removing unless or until it absolutely needs to be. > > You miss my point, in relation to the weight the motors are really small. In fact, pretty many on this mailing list said it was not possible to run a machine with such small motors. Still, I cut metal at high speed. It's not the motors that are weak, it's the spindle. Is the table five times the width in length? If it is solid 10 cm you have 258 kg moving weight. Lets say you want 10m/s, 0.3 seconds in acceleration time, 5 mm pitch and 300 kg moving mass you will end up with a need of 0.5 Nm to drive the table at 500 N applied cutting force and 4.1 Nm to accelerate. Assume you don't have linear guides (i.e. sliding guides) you need 4.5 Nm to accelerate. That is a peak value. I have a set of 4 Nm constant tourqe motors in the workshop rated 750 W, they are beefy bastards. You don't need that. Of course you could have it if you like speed and nasty accelerations (I'm the last to say else, I like overkill), but then you also need a fat ball screw that doesn't bend and preferably cooling on the ball nuts. Go large if you want, it's not necessary though. /Sven -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
On Thu, 9/5/13, Sven Wesley wrote: I don't know what your machine looks like, but I think many people believe they need much larger servos than actually needed. My steel router has a gantry weight around 80-90 kg and is driven by small Nidec servos rated at 80 V (really small). That's not even 200 pounds. The table on this mill is 10x50" - 25.4x127 centimeters, 4" - 10cm at its thickest, of cast iron, plus the saddle. That's a lot of weight to move, which I'm not in the least interested in removing unless or until it absolutely needs to be. -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
On Thu, 2013-09-05 at 20:19 -0400, Kerry Lynn wrote: > On 9/5/13 7:07 AM, Gregg Eshelman wrote: > > On Thu, 9/5/13, andy pugh wrote: > > > > Subject: Re: [Emc-users] Servo motor watts VS torque? > > To: "Enhanced Machine Controller (EMC)" > > Date: Thursday, September 5, 2013, 3:19 AM > > > > On 5 September 2013 05:40, Gregg > > Eshelman > > wrote: > > > The old motors were 5.8 amp cont, 30 amp peak. Stall > > torque 3NM cont. Max RPM 2400. Max voltage 140 DC > > 140V * 30A = 4200W > > 140V * 5.8A = 800W > > 3Nm * 2400 rpm = 750W > > > > You probably want at least 750W motors, geared to suit any > > difference in nominal motor speed. > > > > My small knee mill seems pretty reasonable with 750W > > brushless servos. > > Though I suspect that I am limited by software commutation > > at that top speed end. > > --- > > > > The Servo Dynamics SDF1525-12 is rated at 120 volts so I assume the motors > > never saw 140 volts. Still nearly 700 Watts. > Divide watts by 746 to get hp. Before you jump check to see if those amps weren't connected directly to the line. The set I have of SD board amps just like your's that runs directly off line voltage. It is a little hot but those motor are rather responsive at 167 VDC. ;-) Dave > > Under the heading "you get what you pay for", have you looked at the Teknic > Hudson series? http://www.teknic.com/products/motor_sel.php# > > They are available in a variety of stack lengths and windings, and sold > in the > US by Bearing Engineers: > http://www.bearingengineers.com/products/product.php?id=223 > Bearing Engineers have app specialists who would be happy to talk with you. > > No affiliation, just looking into these for one of my projects. > > -- > > Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! > > Discover the easy way to master current and previous Microsoft technologies > > and advance your career. Get an incredible 1,500+ hours of step-by-step > > tutorial videos with LearnDevNow. Subscribe today and save! > > http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk > > ___ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > -- > Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! > Discover the easy way to master current and previous Microsoft technologies > and advance your career. Get an incredible 1,500+ hours of step-by-step > tutorial videos with LearnDevNow. Subscribe today and save! > http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
On 9/5/13 7:07 AM, Gregg Eshelman wrote: > On Thu, 9/5/13, andy pugh wrote: > > Subject: Re: [Emc-users] Servo motor watts VS torque? > To: "Enhanced Machine Controller (EMC)" > Date: Thursday, September 5, 2013, 3:19 AM > > On 5 September 2013 05:40, Gregg > Eshelman > wrote: > > The old motors were 5.8 amp cont, 30 amp peak. Stall > torque 3NM cont. Max RPM 2400. Max voltage 140 DC > 140V * 30A = 4200W > 140V * 5.8A = 800W > 3Nm * 2400 rpm = 750W > > You probably want at least 750W motors, geared to suit any > difference in nominal motor speed. > > My small knee mill seems pretty reasonable with 750W > brushless servos. > Though I suspect that I am limited by software commutation > at that top speed end. > --- > > The Servo Dynamics SDF1525-12 is rated at 120 volts so I assume the motors > never saw 140 volts. Still nearly 700 Watts. Divide watts by 746 to get hp. Under the heading "you get what you pay for", have you looked at the Teknic Hudson series? http://www.teknic.com/products/motor_sel.php# They are available in a variety of stack lengths and windings, and sold in the US by Bearing Engineers: http://www.bearingengineers.com/products/product.php?id=223 Bearing Engineers have app specialists who would be happy to talk with you. No affiliation, just looking into these for one of my projects. > -- > Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! > Discover the easy way to master current and previous Microsoft technologies > and advance your career. Get an incredible 1,500+ hours of step-by-step > tutorial videos with LearnDevNow. Subscribe today and save! > http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
> Anyway, you can compute the linear force a ballscrew can exert from > some given motor torque, and then compute how much acceleration in > G's that will give. That is a good exercise, rather than talking about > motor Watts. > > Jon > > ...which you can do with my calc sheet posted earlier. :) /S -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
Gregg Eshelman wrote: > > What I'm looking for is for each type of motor (AC and BLDC) is "You want at > least x watts and n amps to at least be in the same range as the old motor." > On cncdrives.com I noticed the torque values listed are different for AC and > DC motors of the same watts. > > The old motors were 5.8 amp cont, 30 amp peak. Stall torque 3NM cont. Max RPM > 2400. Max voltage 140 DC. > Now, there's an important data point missing from your original question! RPM. So, a motor of so many Watts can be wound for low-speed or high-speed operation. Belt drives have a limited ratio they can provide in one stage. So, a 3:1 or 4:1 reduction is the maximum that is practical in this case. Also, as the belt reduction increases, the motor's OWN inertia becomes dominant. That's why many machine tools run the motors 1:1 with massively oversized motors to get the required torque for acceleration. But, modern motors, especially the brushless type, have low enough rotational inertia that a 2:1 ratio will be just fine. Anyway, you can compute the linear force a ballscrew can exert from some given motor torque, and then compute how much acceleration in G's that will give. That is a good exercise, rather than talking about motor Watts. Jon -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
2013/9/5 Gregg Eshelman > On Thu, 9/5/13, andy pugh wrote: > > Subject: Re: [Emc-users] Servo motor watts VS torque? > To: "Enhanced Machine Controller (EMC)" > Date: Thursday, September 5, 2013, 3:19 AM > > On 5 September 2013 05:40, Gregg > Eshelman > wrote: > > The old motors were 5.8 amp cont, 30 amp peak. Stall > torque 3NM cont. Max RPM 2400. Max voltage 140 DC > 140V * 30A = 4200W > 140V * 5.8A = 800W > 3Nm * 2400 rpm = 750W > > You probably want at least 750W motors, geared to suit any > difference in nominal motor speed. > > My small knee mill seems pretty reasonable with 750W > brushless servos. > Though I suspect that I am limited by software commutation > at that top speed end. > --- > > The Servo Dynamics SDF1525-12 is rated at 120 volts so I assume the motors > never saw 140 volts. Still nearly 700 Watts. > > I don't know what your machine looks like, but I think many people believe they need much larger servos than actually needed. My steel router has a gantry weight around 80-90 kg and is driven by small Nidec servos rated at 80 V (really small). I can assure you that my computer is the bottleneck and if I go from max feed to a complete stop the whole table shakes. It's all about acceleration, and I can accelerate pretty fast. If I don't remember wrong I lowered the max_accel value to 2250 from 3000 to be able to cut with the table jumping around. This machine has a belt reduction and 5 mm pitch so I have no problem running alu or steel despite the small motors, it's the spindle that doesn't take it. /S -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
On Thu, 9/5/13, andy pugh wrote: Subject: Re: [Emc-users] Servo motor watts VS torque? To: "Enhanced Machine Controller (EMC)" Date: Thursday, September 5, 2013, 3:19 AM On 5 September 2013 05:40, Gregg Eshelman wrote: > The old motors were 5.8 amp cont, 30 amp peak. Stall torque 3NM cont. Max RPM 2400. Max voltage 140 DC 140V * 30A = 4200W 140V * 5.8A = 800W 3Nm * 2400 rpm = 750W You probably want at least 750W motors, geared to suit any difference in nominal motor speed. My small knee mill seems pretty reasonable with 750W brushless servos. Though I suspect that I am limited by software commutation at that top speed end. --- The Servo Dynamics SDF1525-12 is rated at 120 volts so I assume the motors never saw 140 volts. Still nearly 700 Watts. -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
On 5 September 2013 05:40, Gregg Eshelman wrote: > The old motors were 5.8 amp cont, 30 amp peak. Stall torque 3NM cont. Max RPM > 2400. Max voltage 140 DC 140V * 30A = 4200W 140V * 5.8A = 800W 3Nm * 2400 rpm = 750W You probably want at least 750W motors, geared to suit any difference in nominal motor speed. My small knee mill seems pretty reasonable with 750W brushless servos. Though I suspect that I am limited by software commutation at that top speed end. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
An important spec to look for in any motor is the stall torque to give an idea of its ability to move a dead load like a machine table that also has stiction (stationary friction) and any other load on the table to overcome. Note power is the product of torque and rpm the formulas are on http://www.engineeringtoolbox.com/electrical-motors-hp-torque-rpm-d_1503.html including some example motor ratings Use a motor man enough for the job This is from a user who is about to rebuild the X slide due to friction problems when static Dave Caroline On Thu, Sep 5, 2013 at 5:40 AM, Gregg Eshelman wrote: > On Wed, 9/4/13, Jack Coats wrote: > > Subject: Re: [Emc-users] Servo motor watts VS torque? > To: "Enhanced Machine Controller (EMC)" > Date: Wednesday, September 4, 2013, 8:18 PM > > >From what I have been told, the > Amps is the 'power', but more volts is the > 'speed' and responsiveness component. > > Watts is Volts times Amps, and is defined as 'power'. > > The 'torque' would be more the 'amps' than power, but > obviously they are related. > > Does that help? > -- > > What I'm looking for is for each type of motor (AC and BLDC) is "You want at > least x watts and n amps to at least be in the same range as the old motor." > On cncdrives.com I noticed the torque values listed are different for AC and > DC motors of the same watts. > > The old motors were 5.8 amp cont, 30 amp peak. Stall torque 3NM cont. Max RPM > 2400. Max voltage 140 DC. > > I don't know how much the table and saddle weigh, but having had the table > and saddle off a slightly smaller Lagun to do long overdue cleaning and nut > replacement, I know it's a rather large number of pounds or kilos. There's > some videos on youtube of old Anilam Crusader M systems on knee mills, > presumably with 140V brush DC motors like these, and they don't appear to be > too sprightly. > > Have a look at this. It's a bed mill, it must have some real powerful motors > to move that fast. http://www.youtube.com/watch?v=E3AqIZURMbI I don't expect > a knee mill to be that fast, but it should be able to be at least somewhat > quicker than it was out the factory door 23 years ago, with newer motors and > control systems. > > -- > Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! > Discover the easy way to master current and previous Microsoft technologies > and advance your career. Get an incredible 1,500+ hours of step-by-step > tutorial videos with LearnDevNow. Subscribe today and save! > http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
On Wed, 9/4/13, Jack Coats wrote: Subject: Re: [Emc-users] Servo motor watts VS torque? To: "Enhanced Machine Controller (EMC)" Date: Wednesday, September 4, 2013, 8:18 PM >From what I have been told, the Amps is the 'power', but more volts is the 'speed' and responsiveness component. Watts is Volts times Amps, and is defined as 'power'. The 'torque' would be more the 'amps' than power, but obviously they are related. Does that help? -- What I'm looking for is for each type of motor (AC and BLDC) is "You want at least x watts and n amps to at least be in the same range as the old motor." On cncdrives.com I noticed the torque values listed are different for AC and DC motors of the same watts. The old motors were 5.8 amp cont, 30 amp peak. Stall torque 3NM cont. Max RPM 2400. Max voltage 140 DC. I don't know how much the table and saddle weigh, but having had the table and saddle off a slightly smaller Lagun to do long overdue cleaning and nut replacement, I know it's a rather large number of pounds or kilos. There's some videos on youtube of old Anilam Crusader M systems on knee mills, presumably with 140V brush DC motors like these, and they don't appear to be too sprightly. Have a look at this. It's a bed mill, it must have some real powerful motors to move that fast. http://www.youtube.com/watch?v=E3AqIZURMbI I don't expect a knee mill to be that fast, but it should be able to be at least somewhat quicker than it was out the factory door 23 years ago, with newer motors and control systems. -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
>From what I have been told, the Amps is the 'power', but more volts is the 'speed' and responsiveness component. Watts is Volts times Amps, and is defined as 'power'. The 'torque' would be more the 'amps' than power, but obviously they are related. Does that help? -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
On 09/04/2013 06:25 PM, Gregg Eshelman wrote: ... snip > That's why I'm concerned about the peak torque. The mill has a 10x50" > table which is a large hunk of iron to push around and I don't want > to end up with a real slowpoke of a machine. Ideally I'd like to have > it performing quite a bit better. ... snip Speed comes from voltage, torque from current. In my opinion, I would not consider anything less than 90 volts at 10 amps, or 900 Watts, or 1.5 HP. Similar to: http://www.wallacecompany.com/machine_shop/bridgeport/00047-1a.jpg This is a 90V treadmill motor run by a Pico PWM input amp. If I were starting a new project I would consider a brushless DC motor, maybe with a Pico brushless amp: http://pico-systems.com/acservo.html -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
On Wed, 9/4/13, Sven Wesley wrote: Subject: Re: [Emc-users] Servo motor watts VS torque? To: "Enhanced Machine Controller (EMC)" Date: Wednesday, September 4, 2013, 3:29 PM 2013/9/4 Gregg Eshelman > ... > This CNC parts business makes the worst of PC parts vendors I've dealt > with in 30 years look like the pinnacle of responsiveness to customers. > > > Gregg, are you in EU? I have bought a bunch of stuff from cncdrive.com. Balazs is very friendly and service minded, he's not using LinuxCNC but all his drivers (which I am super satisfied with) works very well in our environment. -- I'm in the USA so cncdrive.com is a long way away, both in distance and budget. ;-) -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
On Wed, 9/4/13, Sven Wesley wrote: Subject: Re: [Emc-users] Servo motor watts VS torque? To: "Enhanced Machine Controller (EMC)" Date: Wednesday, September 4, 2013, 3:29 PM 2013/9/4 Gregg Eshelman > ... > This CNC parts business makes the worst of PC parts vendors I've dealt > with in 30 years look like the pinnacle of responsiveness to customers. > > > Gregg, are you in EU? I have bought a bunch of stuff from cncdrive.com. Balazs is very friendly and service minded, he's not using LinuxCNC but all his drivers (which I am super satisfied with) works very well in our environment. Oh BTW, driving torque is not a big deal. Torque needed for acceleration is. You can use my little calculator to get a figure: http://bit.ly/16DrFdP Tweak the yellow fields and the blue is your outcome. /Sven That's why I'm concerned about the peak torque. The mill has a 10x50" table which is a large hunk of iron to push around and I don't want to end up with a real slowpoke of a machine. Ideally I'd like to have it performing quite a bit better. -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
On 4 September 2013 20:36, Gregg Eshelman wrote: > Since my "deal" on the Sanyo-Denki closed loop stepper motors and drivers is > a bust*, I'm still hunting motors and drivers at an affordable price. (Which > right now is as much under $1,000 as I can get.) This guy (in South Korea) is listing a lot of stuff. http://stores.ebay.co.uk/FA-PARTS/SERVO-DRIVE-AMP-MOTOR-/_i.html?_nkw=3-axis&submit=Search&_fsub=456141017&_sid=542968597 Note that is _only_ his 3-axis sets. > What I'm running into a lot are servo motors that the only spec listed for > power is Watts, or if there's a torque value it must be running torque, > usually below 1 newton-meter which seems ridiculously low for the size of > motors. The point is that you get a lot back in the gearing. If a motor is 1Nm at 3000 rpm and you actually only need 300rpm on the screw, then you can see that as 10Nm. > * Missing control wires and connectors that Sanyo-Denki wants $88 *each* for I note the other problems, but shopping around for connectors might help, and there are third-party cable assemblers (who can generally build them cheaper than you can) -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
2013/9/4 Gregg Eshelman > ... > This CNC parts business makes the worst of PC parts vendors I've dealt > with in 30 years look like the pinnacle of responsiveness to customers. > > > Gregg, are you in EU? I have bought a bunch of stuff from cncdrive.com. Balazs is very friendly and service minded, he's not using LinuxCNC but all his drivers (which I am super satisfied with) works very well in our environment. Oh BTW, driving torque is not a big deal. Torque needed for acceleration is. You can use my little calculator to get a figure: http://bit.ly/16DrFdP Tweak the yellow fields and the blue is your outcome. /Sven -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
On Wed, 9/4/13, andy pugh wrote: Subject: Re: [Emc-users] Servo motor watts VS torque? To: "Enhanced Machine Controller (EMC)" Date: Wednesday, September 4, 2013, 1:57 PM On 4 September 2013 20:36, Gregg Eshelman wrote: > Since my "deal" on the Sanyo-Denki closed loop stepper motors and drivers is a bust*, I'm still hunting motors and drivers at an affordable price. (Which right now is as much under $1,000 as I can get.) This guy (in South Korea) is listing a lot of stuff. http://stores.ebay.co.uk/FA-PARTS/SERVO-DRIVE-AMP-MOTOR-/_i.html?_nkw=3-axis&submit=Search&_fsub=456141017&_sid=542968597 Note that is _only_ his 3-axis sets. I've seen those, just don't know what wattage of motor is equivalent to or better than the old ones. Another thing I've found is a lot of kits people put together have two lower power motors and one higher power, intended for an aluminum gantry where the moving parts are far lighter than the table on a knee mill. I need the opposite, two more powerful motors and the Z axis one would be fine if it's only as strong as the old one. I contacted fa-parts through eBay with what I have a need for but no reply. What's the point of doing business online if you don't respond to inquires which could lead to sales? Same story with the company that manufactures the connectors Sanyo-Denki uses. They don't have the exact part number so I asked what they had that is plug compatible and how much? No reply. No luck finding the connectors from other sources. The Yaskawa drives look like they use Centronics style connectors of the same style in various sizes. I've seen the type at places like Mouser. The Sanyo-Denki ones have 6 connectors that are all completely different, made by at least three manufacturers. They put the manufacturers part numbers in the data sheets but I couldn't find any other sources that will answer their e-mail. This CNC parts business makes the worst of PC parts vendors I've dealt with in 30 years look like the pinnacle of responsiveness to customers. -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
