Re: How fast is your homemade CNC?
Quote:
Originally Posted by
linkreincarnate
what are your specs for that machine?
The most up to date specs look something like this:
Footprint (total area it is occupying in the room): 750 x 650mm
Table height from floor: 890mm
Y table size: 450 x 300mm
Weight of Y: 17,5kg
Working area: 310 x 270mm
Weight of X-beam: 13,7kg
Size of the X-beam (height x width): 500 x 540mm
Size of Z: 350 x 150 mm
Weight of Z: 8.5kg
Z clearance from table top: 135mm
Maximum speed: 8000mm/min
Maximum acceleration: 700mm/s/s
Stepper motor data: NEMA23 2.7V/phase, 3A, 1.6uh, 0.9 Ohm/phase
Stepper motor driver: DQ542MA
Stepper drivers PSU: 44VDC unregulated supply, based on a thoroidal transformer
Motion controller: UC300ETH from CNC Drive
Spindle motor: 400Hz, 24,000 RPM 65mm diameter air cooled 1.5kW spindle
Spindle motor power supply: Bosch Rexroth EFC 5610 VFD
Spindle control via Modbus communication
CNC software: UCCNC from CNC Drive
I think the above is pretty accurate. I am making changes all the time since it is a DIY CNC of my own design. Note that axis weights are only approximate (parts measured before installation) and the weight does not include the steppers and wiring.
Re: How fast is your homemade CNC?
Is it possible above 200 ipm with 5 tpi with a stepper system.
Re: How fast is your homemade CNC?
Quote:
Originally Posted by
bewerbung
Is it possible above 200 ipm with 5 tpi with a stepper system.
Absolutely. The rotational speed at 200 ipm would be 1 000 RPM; some steppers are capable to turn almost twice as fast with enough torque left.
How fast is your homemade CNC?
Quote:
Originally Posted by
bewerbung
Is it possible above 200 ipm with 5 tpi with a stepper system.
I'm running 5tpi ballscrews about 1200rpm. I clocked them at 1500rpm but backed it down a bit. 270oz-in, gecko201, 56volt PS.
The ballscrew are ground NSK about 25mm diameter.
https://youtu.be/bNvEIen90wQ
Speed test when I first put the machine together. 1500rpm, 300ipm
Re: How fast is your homemade CNC?
Didn't answer the Poll, However, performance is always related to budget. While I can afford much more than I built my router for, I backed off on IPM to meet practical requiements. I don't need to make money on my machine, I need to get accurate parts from it. To me, accuracy is more important than speed. Probably skews the data you are collecting, however, speed isn't everything!!!
Chris D
Re: How fast is your homemade CNC?
Hi Camera
some of my machine specs are similar to you.
NEMA 23 3.5Asteppers, 2 slaved on Y axis. driven by DM556 on 36V. driving 1605 1-start ball screw. but i cant get more than 600mm/minute.
can you help ??
Re: How fast is your homemade CNC?
I was at 60ipm rapids and 40ipm cutting with my original 10tpi acme machine and HobbyCNC controller. It would sometimes stall cutting and I would back off to 30ipm.
I switched to 5mm ballscrews and measured 120ipm rapids before stopping the test. They probably could go higher, but I didn't try. I typically cut around 60ipm.
Steve
Re: How fast is your homemade CNC?
i converted my taig to 3mm pitch ballscrews and 120IPM is the new maximum. the 8 mm diameter ballscrews are only rated to 300 lb force so i'm scared of breaking them.
Re: How fast is your homemade CNC?
Quote:
Originally Posted by
Eldon_Joh
i converted my taig to 3mm pitch ballscrews and 120IPM is the new maximum. the 8 mm diameter ballscrews are only rated to 300 lb force so i'm scared of breaking them.
300 lbs is a lot for a Taig. It should be fine.
Re: How fast is your homemade CNC?
G0704 with Allen Bradley AC servo motors. 5000rpm on a 5tpi ballscrew gives 1000ipm without a complaint. Z axis get a little low frequency vibration due to the unsupported screw but it is not bad at all. I usually keep the rapids at 100ipm when proofing a part and 600ipm otherwise.
Re: How fast is your homemade CNC?
I'm getting:
65ipm on Y (2 motors)
94ipm on X
~90ipm on Z
I am very new to owning a CNC router and want to improve my machine, could use some advice please.
I want to go faster in the X and Y for cutting foam, can it be as simple as increasing my power supply voltage? I know there are many ways to increase the speed, but upgrading my power supply would be the simplest, biggest bang for my buck right now. However I've been told that since my motors are wired in parallel that doubling my power supply voltage would not help me gain any significant speed, can somebody explain this to me please? I cannot find anything in the forums/internet to confirm this.
Router specs:
4x 556oz Nema23 Stepper Motors, Bipolar parallel, 5.0A rated current, 0.6ohm, 3V, 2.5mH
24V power supply, 12A
4x M542 Leadshine Drivers, 20-50VDC, 4.2A output max (so i'm not fully utilizing the 5A motor? or the possible 48V input?)
AKZ250 USB Controller
1605 C7 ballscrews
If I swapped my power supply from 24 to 48, would I be able to expect a 10%, 50%, or 90% increase in speed?
Thanks in advance.
Re: How fast is your homemade CNC?
Hi Yastron - going to 48V will be a big help in gaining speed. Peter
Re: How fast is your homemade CNC?
Quote:
Originally Posted by
Yastron
I'm getting:
65ipm on Y (2 motors)
94ipm on X
~90ipm on Z
I am very new to owning a CNC router and want to improve my machine, could use some advice please.
I want to go faster in the X and Y for cutting foam, can it be as simple as increasing my power supply voltage? I know there are many ways to increase the speed, but upgrading my power supply would be the simplest, biggest bang for my buck right now. However I've been told that since my motors are wired in parallel that doubling my power supply voltage would not help me gain any significant speed, can somebody explain this to me please? I cannot find anything in the forums/internet to confirm this.
Router specs:
4x 556oz Nema23 Stepper Motors, Bipolar parallel, 5.0A rated current, 0.6ohm, 3V, 2.5mH
24V power supply, 12A
4x M542 Leadshine Drivers, 20-50VDC, 4.2A output max (so i'm not fully utilizing the 5A motor? or the possible 48V input?)
AKZ250 USB Controller
1605 C7 ballscrews
If I swapped my power supply from 24 to 48, would I be able to expect a 10%, 50%, or 90% increase in speed?
Thanks in advance.
Its a good idea to always have some safety margin in both voltage and current. Many drivers can handle their rated power for a short time, but continuously may damage them.
Re: How fast is your homemade CNC?
P.S. My Hurco KMB1 while not home made was home retrofit by me. At one time I tested that 1000lb saddle and table at upto 450 IPM. LOL. I have it set at 150 now as its more than fast enough for 99% of what I do with that machine. I cut at upto 150IPM with it if the cut will allow.
Re: How fast is your homemade CNC?
Quote:
Originally Posted by
peteeng
Hi Yastron - going to 48V will be a big help in gaining speed. Peter
Quote:
Originally Posted by
Bob La Londe
Its a good idea to always have some safety margin in both voltage and current. Many drivers can handle their rated power for a short time, but continuously may damage them.
Thank you for the replies Pete and Bob,
I went ahead and purchased this 48V regulated SPS:
https://www.amazon.ca/gp/product/B00...?ie=UTF8&psc=1
MEAN WELL SE-600-48 AC to DC Power Supply, Single Output, 48V, 12.5 Amp, 600W, 1.5"
and will try running it at ~42 or ~44V to give some safety margin from the 50VDC limit of my stepper drivers.
I may also look at changing my 1605 ballscrews for 1610 ballscrews if I still want more speed after the power supply upgrade.
I regularly do diamond-drag engraving on aluminum (at 20ipm), and am curious how much the coarser pitch would affect my engraved text quality. Any thoughts on this?
I will post my speed increase results after I hook up my new power supply and do some testing.
Re: How fast is your homemade CNC?
Quote:
Originally Posted by
Bob La Londe
P.S. My Hurco KMB1 while not home made was home retrofit by me. At one time I tested that 1000lb saddle and table at upto 450 IPM. LOL. I have it set at 150 now as its more than fast enough for 99% of what I do with that machine. I cut at upto 150IPM with it if the cut will allow.
My benchtop with AC servos hits 1000ipm with some crazy accelerations no problem. Since I do mostly 1 offs (really never more than 10), my Rapid override is always set to 5%. Seems kinda silly :)
Re: How fast is your homemade CNC?
Quote:
Originally Posted by
mcardoso
My benchtop with AC servos hits 1000ipm with some crazy accelerations no problem. Since I do mostly 1 offs (really never more than 10), my Rapid override is always set to 5%. Seems kinda silly :)
Hey, it's better to have it and not need it than the other way around. :-)
Re: How fast is your homemade CNC?
Upgrading 24V -> 48V (running it at 42.7V) got me pretty much double the speed, from 94 -> 180 on X, and 63 -> 120 on Y, and 86 -> 150 on Z. Very exciting stuff. Now how do I get it to 1000 ??
I doubled all the accelerations to X20/Y12/Z18, and I didn't yet push the limits of the tuning... I stalled the X at 200 ipm and just left it at 180, then estimated the Y and Z speeds from my results on X.
Thanks Pete/Bob for the encouragement, very pleased with the speed.
Re: How fast is your homemade CNC?
Quote:
Originally Posted by
mcardoso
My benchtop with AC servos hits 1000ipm with some crazy accelerations no problem. Since I do mostly 1 offs (really never more than 10), my Rapid override is always set to 5%. Seems kinda silly :)
Does it have over a thousand pounds of dead mass riding on the Y axis? LOL
Re: How fast is your homemade CNC?
Quote:
Originally Posted by
Bob La Londe
Does it have over a thousand pounds of dead mass riding on the Y axis? LOL
I wish :) It would be a heck of a lot more rigid than it is.