[Emc-users] Semi OT: Variable speed DC drive for Fanuc brushed DC spindle drive
I think you'd be aiming for a SCR drive, bought or self-made. They're simple and lower cost. Roland On Sat, 10 Feb 2024 at 00:07, Leonardo Marsaglia wrote: > Hello guys, I hope you're doing well > > We just purchased a Mori Seiki SL3 lathe that's going to be > retrofitted with LCNC because it has no control. > > The machine has a brushed DC spindle motor and from what they told me the > DC drive was not working (I would like to check this but I couldn't find > any info or manuals for this drive, the model number of the drive is > A20B-0008-0372/02). I would like to keep this motor because I like the idea > of having high torque at low speeds because I plan to use a milling and > hobbing attachment with this lathe. > > I'm trying to find DC speed controllers of 15 kW or so, just to take a look > at what it's available but it seems difficult to find something that big. > Do you guys recommend any particular brand or source to find such a speed > controller? > > Thanks as always. > > Leonardo > > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Semi OT: Variable speed DC drive for Fanuc brushed DCspindle drive
On 2/9/24 17:06, Leonardo Marsaglia wrote: Hello guys, I hope you're doing well We just purchased a Mori Seiki SL3 lathe that's going to be retrofitted with LCNC because it has no control. The machine has a brushed DC spindle motor and from what they told me the DC drive was not working (I would like to check this but I couldn't find any info or manuals for this drive, the model number of the drive is A20B-0008-0372/02). I would like to keep this motor because I like the idea of having high torque at low speeds because I plan to use a milling and hobbing attachment with this lathe. I'm trying to find DC speed controllers of 15 kW or so, just to take a look at what it's available but it seems difficult to find something that big. Do you guys recommend any particular brand or source to find such a speed controller? Thanks as always. Leonardo 15kw? That isn't going to be pocket change Leonardo. I'm not any where near that class as my go704 rig current limits at 18 amps into a 1 hp motor with a 90 volt, 9.7 amps for one HP which is a bunch puny for my g0704 mill but its been doing it for about a decade. Stalled it may or may not trip a 20 amp 127 volt breaker. Seems to me you'd need a pretty husky version of Jon Elsons pwm-servo. And ISTR that Peter had some bigger ones in years past. What is your available voltage? Actually, it might be productive to check the power bugs in it if you got that controller with the machine. It might be easily repairable by a good electronics tech who would have what it takes to look up what he finds in it and find even better replacements. That tech keeps moving on relentlessly. That is the avenue I'd explore if I was on site. Good luck Leonardo. ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users . Cheers, Gene Heskett, CET. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Semi OT: Variable speed DC drive for Fanuc brushed DC spindle drive
I have 4 drives am going to try from Machdrives.com. They use Tuna graphical software to tune the drives.It is going to be a few months till I get them installed. I will post results then. Be safe. BRF Servo DriveAUD$159 A high performance, 160V 20A brushed DC servo drive. Ideal for CNC mills, routers, lathes and plasma cutters. - 20-160VDC 20A brushed DC servo drive. - Standard isolated PUL/DIR/ENA/ALM interface - Pluggable connectors for easy installation. - Direct controllers support from 3VDC to 30VDC. - Flexible mounting L chassis open frame design. - High efficiency. Minimal heatsinking required. - 9 LED indicators for easy setup and diagnostics. - All digital operation with 32bit ARM CPU. - Smooth silent operation. No dithering. - Easy tuning with free Tuna™ software for Windows. - Safe, easy setup with opto-isolated USB port. - Voltage, current and temperature protection. - Compact light design - 115x74x20mm and 115g . - Designed and manufactured in Australia. On Friday, February 9, 2024 at 05:06:49 PM EST, Leonardo Marsaglia wrote: Hello guys, I hope you're doing well We just purchased a Mori Seiki SL3 lathe that's going to be retrofitted with LCNC because it has no control. The machine has a brushed DC spindle motor and from what they told me the DC drive was not working (I would like to check this but I couldn't find any info or manuals for this drive, the model number of the drive is A20B-0008-0372/02). I would like to keep this motor because I like the idea of having high torque at low speeds because I plan to use a milling and hobbing attachment with this lathe. I'm trying to find DC speed controllers of 15 kW or so, just to take a look at what it's available but it seems difficult to find something that big. Do you guys recommend any particular brand or source to find such a speed controller? Thanks as always. Leonardo ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Semi OT: Variable speed DC drive for Fanuc brushed DC spindle drive
Hello guys, I hope you're doing well We just purchased a Mori Seiki SL3 lathe that's going to be retrofitted with LCNC because it has no control. The machine has a brushed DC spindle motor and from what they told me the DC drive was not working (I would like to check this but I couldn't find any info or manuals for this drive, the model number of the drive is A20B-0008-0372/02). I would like to keep this motor because I like the idea of having high torque at low speeds because I plan to use a milling and hobbing attachment with this lathe. I'm trying to find DC speed controllers of 15 kW or so, just to take a look at what it's available but it seems difficult to find something that big. Do you guys recommend any particular brand or source to find such a speed controller? Thanks as always. Leonardo ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Axis direction
I'd guess that if you were a manufacturer of CNC equipment before the internet age you'd set up the machines however you wanted to lock in your customers. The idea of being compatible with your competitors is just wrong. Now however, we have MACH, LinuxCNC, and a number of embedded systems not to mention the 3D printer world all using G-Code in one form or another. So although the CAD/CAM world still has to be able to support a Z axis where a Z+ moves toward the turning part or spindle the reality is we're fortunately moving toward compatibility. That old piece of iron with Z+ toward has the electronics (no schematics or support) ripped out and new electronics installed and to more of a standard. John > -Original Message- > From: Groups [mailto:gro...@homanndesigns.com] > Sent: February 8, 2024 9:36 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Axis direction > > Hi, > > I�m fairly sure that on a CNC machine the z-axis is the axis parallel to the > spindle. > On a CNC surface grinder, the Z axis is what you would expect to be the Y > axis. > > But in reality you can name them however you like. ?? > > Cheers > > Peter Homann - (from my mobile) > http://www.homanndesigns.com > > > On 7 Feb 2024, at 5:29�am, Chris Albertson > wrote: > > > > ?It is pretty easy to see WHY the z-axis is set up the way it is on a lath > > and a > mill and why it is different. You need a well defined �zero�. On a mill, > the > machine's �zero" is the table and one a mill it is the chuck. A lathe has > not > other well define place on the machine, the tailstock moves. > > > > The after defining the zero point you use the �natural� convention the > number get bigger if you go to the right or up. > > > > This is the normal way engineers thing about corodrnttes. you ask thee > questions IN ORDER > > 1) where is the origin? > > 2) which way does �Z� point > > 3) then apply the right hand rules for X and Y > > > > It�s not just machine tools that do this but everyone from physic research > to aircraft manufacturing. And you do have to answer those question in > order. > > > > #2 is really arbitrary but from 8th grade algebra on, we are used to drawing > graphs with the numbers getting bigger as you go up or right and with the > zero point inthe lower left > > > > > > > >> On Feb 6, 2024, at 6:06�AM, gene heskett > wrote: > >> > >>> On 2/6/24 07:54, Stuart Stevenson wrote: > >>> Ray Henry's story is a Murphy's Law occurrence. I once had a car with a > >>> starter problem. I changed the starter three or four times in quick > >>> succession. I could not figure out why so I purchased two, put one in the > >>> trunk along with tools. I never had to use it. > >> Chuckle. BTDT...Still do at times. Works better than average. But the way > Ray worded it caught me off guard and I literally shook myself laughing for > quite a spell. I spent some time in Iron Mountain MI, about a long hour from > Ray's place, so I visited a couple times while modifying the tv station there > for > digital. > >> > >> If you ever come across any more of those teeny ball screws like you sold > me around 20 years back I've got a place to put them. > >> > >> Take care & stay well, Stuart. > >> > >> Cheers, Gene Heskett, CET. > >> -- > >> "There are four boxes to be used in defense of liberty: > >> soap, ballot, jury, and ammo. Please use in that order." > >> -Ed Howdershelt (Author, 1940) > >> If we desire respect for the law, we must first make the law respectable. > >> - Louis D. Brandeis > >> > >> > >> > >> ___ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > ___ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
