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I think wooden CNC router is not very good alternative for the scroll saw because if we speaking about cutting something like 3/4" plywood it could take relatively long time if router is not beefy...

Too many words, too little meaning. So without backlash compensation and with measured ballscrew backlash of 0.0008'' you have accuratly measured value of 0.0002'', I bet that you also have less than...

109jb, "quite common" were only referenced to sense distance of 4mm, which is usually default for no-name barrel-style proximity switch.

I've seen this video previously, it's just irrelevant cause...

109jb, of course those numbers are for worst case scenario, in one of datasheets i've seen that this numbers were obtained after 8 hours of testing with temperature swing from 10 to 30 degreees...

109jb, 5% of Sn error is straight from datasheet, it's includes variations of supply voltage and ambient temperature. It's considerably better for branded sensors.

Each limit switch will have positional error(repeatability). For example inductive proximity switches has error about 5% of sense distance, so one side of gantry could be triggered on top limit and...

I think that with independent homing you will double your homing error, technically you would be still out of square. I really doubt that independent homing for two steppers would give your more...

datac, I think problem is lies in updated(?) LiquidCrystal_I2C library. I had similar problem with old code and newer i2c lcd-displays, but in my case they didn't show nothing at all, so I switched...

Good point, thank you!

Just curious why someone who has experience with LinuxCNC would use word 'difficult' at all? :D I've partially working setup of MachineKit on RPI2 with software generated step/dir-pulses and it was...

Not all USB-ports dimensionwise are same, so it could be tricky to pick right one. I think it's better to start with checking it with another cable. Touching-up port pins with hot soldering iron also...

If we speaking about Polulu-style drivers based on DRV8825, Vref would be 1.25V, you could check it here https://www.pololu.com/product/2133
Vref could be different because it's depends on some...

Are you sure that you have set vref correctly? Mine drv8825 are really hot when set for 2+ amps(like 60 or 70 degrees Celsius), but I have tuned grbl to keep steppers always on because my router is...

I've tried it with Grbl Panel and it's working as expected. GRBL version is 1.1f 20170531

So if in absolute distance mode I'll jog to X100, then issue G0X120 command, GRBL will report work coordinates X120 Y_something Z_something but tool will actually move to something less than X100?...

Why it's problem? If G0 is current motion state and X passed without any axis values GRBL throws out alarm after next command: "2: Numeric value format is not valid or missing an expected value". If...

Hi,

You didn't mentioned which g-code sender was used. Looks like grbl goes to alarm state for some reason, so all subsequent commands are halted, alarm state could be disabled with grbl's soft...

It's quite obvious why noone wants to help you ;)

Toshiba's IC is used in thousand of different boards, how anyone would know what particular board do you have? Wiring could be as simple as connecting STEP/DIR pins on UNO to corresponding terminals...

Just in case if someone would run in similar problem I leave my note for the History :cheers:


I've checked spindle's RPM and it was much lower than I expected, all calculated feeds and speeds...

Looks like it's not directly connected with actual cutting but with rapid moves between cuts, it's possible that acceleration is set too high so steppers are stalling. But I assume that it's not your...

I've heard that 4-axis port of grbl exist but it's unlikeable that it be included in main branch, full support for continuous 5-axis is highly unlikeable because there no free CAM that could do it....

CAMotics is simulation for 3-axis mill, it could generate facet model by running g-code in virtual stock, result could be saved in stl-file and measured in any mesh editor.

CAMotics site.

No luck here. It's exactly same error of 0.3mm. Three runs with different feeed and speeds, original toolpath was bit aggressive which resulted in chatter so I was forced to lower stepover and feed....

Per specs cutter is 1/8inch(3.175mm), my measurment is something like 3.165

I think if my problem is related to cutter diameter or backlash or whatever which is measurments related it will be same for outer contours as well, but they are good as could be :-) But I will...

It's bit late but :-)

You should buy a spindle controller with PWM input, something like this https://www.inventables.com/technologies/spindle-speed-controller , eBay and AliExpress has many of...

Hi,

I've stuck with calibration of my GRBL-driven CNC router :confused: It's was built around OpenBuilds linear rails and has plain simple stepper motors and GT2 belts on x/y axis. I've calculated...