Re: [Emc-users] Slow axis router
When I did the research for my plasma table (500 IPM) I found that good quality stepper drivers and voltage along with proper gearing made all the difference in speed. I went with a 63 volt power supply to obtain the best speed from my steppers. There is a ton of information on the EMC wiki site on this as well as a couple of spreadsheets to help you figure it all out. I studied the torqe curves for my steppers to find the rpm I wanted them to go at the rapid speed. and you don't mention your setup so it is hard to guess what you have to know if anyone has a similar setup. In my case I used: Gecko G203v drives Antek 63v power supply Automation Direct steppers stp-mtr-23079 CNC4PC BOB John On 2 Jan 2009 at 18:07, aaron Moore wrote: > Hi > > Having built a 1.5 m x 1.5 m CNC gantry router used for woodwork, I > am > still amazed that it works as well as it does, however I am now > thinking > that the axis should be moving a little bit faster ( I recently > costed a > job that would have taken 15 hours to cut which seems a bit > excessive). > > It is set to run at 15mm per second max velocity, above that speed > the > steppers start screaming and miss stepps. I know that the screws, > bearings and drive nuts are not that well aligned and whip about > abit. I > plan to fix that soon, but I would like to know what sort of speed > I > should aim for. Is there any one out there with a similar set up > who > could tell me what max speed they are working to. > > All the best for the new year > > Aaron > > -- > Powered by Outblaze > > -- > ___ > 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] Slow axis router
Aaron, all depends on the construction of the machine. I built a 1.5 x 2 m gantry used for foam, wood and aluminum. Specs: Double X-axis with 25 mm linear guide rails, Y and Z using 20 mm rails with 2 carriages on each rail. Stepper motors are 6.4 Nm (NEMA34 size) with stepper motor drivers using 16 micro steps, 5.6A current and a 42 V power supply (14 Amps) using a 1 to 1 pulley ratio on ball screws with 5mm pitch. This is able to move the X axis at 2000 mm/min, Y and Z at 2200 mm/min. Using a 3 to 1 pulley ratio speeds up to 6000 mm/min are possible but the pulleys ran of the ball screws due to improper drilled holes ... With the ball screw nuts removed I need about 6 kg force to move the X-axis (measured using a scale beam). Nuts are adjusted to have no play The speed is limited due to the motor losing steps: I cannot get the motor moving reliable at more than 24 kHz (16 micro steps, 1.8 deg./rev = 455 rpm) even if the motor has nothing connected. I still have to try other stepper drivers to see if that changes the max. speed. Regards, Rob aaron Moore wrote: > Hi > > Having built a 1.5 m x 1.5 m CNC gantry router used for woodwork, I am > still amazed that it works as well as it does, however I am now thinking > that the axis should be moving a little bit faster ( I recently costed a > job that would have taken 15 hours to cut which seems a bit excessive). > > It is set to run at 15mm per second max velocity, above that speed the > steppers start screaming and miss stepps. I know that the screws, > bearings and drive nuts are not that well aligned and whip about abit. I > plan to fix that soon, but I would like to know what sort of speed I > should aim for. Is there any one out there with a similar set up who > could tell me what max speed they are working to. > > All the best for the new year > > Aaron > > -- ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Slow axis router
On Fri, 2 Jan 2009 21:23:33 -, you wrote: >I am not a real woodworker but I know from hand routing experience that too >slow a feed gives burning especially on endgrain of hardwoods. You need >plenty of chips flying off because most of the heat from cutting is carried >away by them. > >I think you need to start from the manufacturers feed/speed advice for the >tooling and materials you want to use to set the required max. cutting >speed. Yep, your right John - only accurate figures can be obtained from the tool manufacturer and experience. There's plenty of good information on the woodweb site, starting here http://www.woodweb.com/knowledge_base/Determining_CNC_feeds_and_speeds.html Steve Blackmore -- -- ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Slow axis router
aaron Moore writes: > > Hi > > snip > > It is set to run at 15mm per second max velocity, above that speed the > steppers start screaming and miss stepps. I > plan to fix that soon, but I would like to know what sort of speed I > should aim for. Is there any one out there with a similar set up who > could tell me what max speed they are working to. > > All the best for the new year > > Aaron > Aaron, I don't claim that my router is anywhere near the best but I cut at 75ipm (31.75mm sec) and it will rapid at over 200ipm (about 85mm sec). Mine used to cut much slower but playing with stepgen for awhile got it moving much faster. I know some other guys that are cutting over 100ipm (about 42mm sec). Alan -- ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Slow axis router
Aaron, greetings I am not a real woodworker but I know from hand routing experience that too slow a feed gives burning especially on endgrain of hardwoods. You need plenty of chips flying off because most of the heat from cutting is carried away by them. I think you need to start from the manufacturers feed/speed advice for the tooling and materials you want to use to set the required max. cutting speed. Rapids can affect the length of a job too of course but not the quality. John Prentice - Original Message - From: "aaron Moore" To: "EMC userslist" Sent: Friday, January 02, 2009 6:07 PM Subject: [Emc-users] Slow axis router > > Hi > > Having built a 1.5 m x 1.5 m CNC gantry router used for woodwork, I am > still amazed that it works as well as it does, however I am now thinking > that the axis should be moving a little bit faster ( I recently costed a > job that would have taken 15 hours to cut which seems a bit excessive). > > It is set to run at 15mm per second max velocity, above that speed the > steppers start screaming and miss stepps. I know that the screws, > bearings and drive nuts are not that well aligned and whip about abit. I > plan to fix that soon, but I would like to know what sort of speed I > should aim for. Is there any one out there with a similar set up who > could tell me what max speed they are working to. > > All the best for the new year > > Aaron > > -- > Powered by Outblaze > -- > ___ > 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] Slow axis router
On Fri, Jan 2, 2009 at 2:19 PM, Chris Morley wrote: > > Aaron > > If you told us more specific you would get better answers. > eg size of steppers, driver type, voltage of power supply > type of lead screw and acceleration settings would be a > good start. > > Chris M > For comparison - 48"X24"X4" gantry style router (Lionclaw Kit). Porter cable 1.5hp router as spindle I am using a hobbycnc driver with 205 oz/in steppers direct driving 1/2 -10 single start ACME threads with DumpsterCNC backlash nuts. Driver halfstepping at 28V (board rated to 42v). It can easily cut at 40ipm (~1000mmpm) with a .25" endmill .25" deep in MDF. My machine flexes too much at higher cutting rates. For rapids, I can get well over 100ipm when its tuned up. HTH Brian -- ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Slow axis router
Aaron If you told us more specific you would get better answers. eg size of steppers, driver type, voltage of power supply type of lead screw and acceleration settings would be a good start. Chris M > From: glenn@batnet.coma > To: emc-users@lists.sourceforge.net > Date: Fri, 2 Jan 2009 11:06:24 -0800 > Subject: Re: [Emc-users] Slow axis router > > Aaron, > > If you look at what the commercial guys can do, you will see what the > ultimate ceiling is for us hobbyists. I know the CNC Router from Haas (very > high-end machine) can do 2000 in/min (850 mm/s) in fast slew mode. Of > course, it can't cut at that speed. Anyway, I like to consider how long do > I want to wait as the machine goes from end to end. In your case that is > 100 sec. So how about 30 sec? Then you need about 3x from where you are > now. Good luck! > > Glenn > > -Original Message- > From: emc-users-boun...@lists.sourceforge.net > [mailto:emc-users-boun...@lists.sourceforge.net] On Behalf Of aaron Moore > Sent: Friday, January 02, 2009 10:08 AM > To: EMC userslist > Subject: [Emc-users] Slow axis router > > Hi > > Having built a 1.5 m x 1.5 m CNC gantry router used for woodwork, I am > still amazed that it works as well as it does, however I am now thinking > that the axis should be moving a little bit faster ( I recently costed a job > that would have taken 15 hours to cut which seems a bit excessive). > > It is set to run at 15mm per second max velocity, above that speed the > steppers start screaming and miss stepps. I know that the screws, bearings > and drive nuts are not that well aligned and whip about abit. I plan to fix > that soon, but I would like to know what sort of speed I should aim for. Is > there any one out there with a similar set up who could tell me what max > speed they are working to. > > All the best for the new year > > Aaron > > -- > Powered by Outblaze > > -- > ___ > 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 _ Show them the way! Add maps and directions to your party invites. http://www.microsoft.com/windows/windowslive/events.aspx -- ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Slow axis router
Aaron, If you look at what the commercial guys can do, you will see what the ultimate ceiling is for us hobbyists. I know the CNC Router from Haas (very high-end machine) can do 2000 in/min (850 mm/s) in fast slew mode. Of course, it can't cut at that speed. Anyway, I like to consider how long do I want to wait as the machine goes from end to end. In your case that is 100 sec. So how about 30 sec? Then you need about 3x from where you are now. Good luck! Glenn -Original Message- From: emc-users-boun...@lists.sourceforge.net [mailto:emc-users-boun...@lists.sourceforge.net] On Behalf Of aaron Moore Sent: Friday, January 02, 2009 10:08 AM To: EMC userslist Subject: [Emc-users] Slow axis router Hi Having built a 1.5 m x 1.5 m CNC gantry router used for woodwork, I am still amazed that it works as well as it does, however I am now thinking that the axis should be moving a little bit faster ( I recently costed a job that would have taken 15 hours to cut which seems a bit excessive). It is set to run at 15mm per second max velocity, above that speed the steppers start screaming and miss stepps. I know that the screws, bearings and drive nuts are not that well aligned and whip about abit. I plan to fix that soon, but I would like to know what sort of speed I should aim for. Is there any one out there with a similar set up who could tell me what max speed they are working to. All the best for the new year Aaron -- Powered by Outblaze -- ___ 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] Slow axis router
Hi Having built a 1.5 m x 1.5 m CNC gantry router used for woodwork, I am still amazed that it works as well as it does, however I am now thinking that the axis should be moving a little bit faster ( I recently costed a job that would have taken 15 hours to cut which seems a bit excessive). It is set to run at 15mm per second max velocity, above that speed the steppers start screaming and miss stepps. I know that the screws, bearings and drive nuts are not that well aligned and whip about abit. I plan to fix that soon, but I would like to know what sort of speed I should aim for. Is there any one out there with a similar set up who could tell me what max speed they are working to. All the best for the new year Aaron -- Powered by Outblaze -- ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
