How fast is your homemade CNC?

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Originally Posted by linkreincarnate

what are your specs for that machine?

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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.

Is it possible above 200 ipm with 5 tpi with a stepper system.

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Originally Posted by bewerbung

Is it possible above 200 ipm with 5 tpi with a stepper system.

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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.

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Originally Posted by bewerbung

Is it possible above 200 ipm with 5 tpi with a stepper system.

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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

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

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 ??

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

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.

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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.

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300 lbs is a lot for a Taig. It should be fine.

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.

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.

Hi Yastron - going to 48V will be a big help in gaining speed. Peter