On 4/15/24 21:16, Gregg Eshelman via Emc-users wrote:
I have a Hictop printer with some issues so I'm gathering parts to update it. Among them is a Big Tree Tech SKR 1.4 board (not the Turbo, which is identical except runs the CPU 10Mhz faster).
Are you talking to me?
Do you have any experience with that one? There are a ton of display boards for BTT controllers but what I haven't been able to find is a list of what's compatible with which. Stepper drivers shouldn't be a issue since it looks like it takes normal StepStick / Pololu modules. I see someone did get around to making the bleedin obvious accessory, the StepStick breakout to screw terminals. https://forum.makerforums.info/t/ariel-yahni-here-is-a-better-picture-of-the-stepstick-breakout-board/7272
The breakout board I'm using plugs into a stepstick socket, gives 2 6 pin sockets I plug a 6 pin pigtail into then fire up the system and use my scope to identify which 4 wires I need to drive a separate stepper/servo driver, like the hanpose LC42 or LC57 for bigger nema 23 versions. The LC42 is rated for use with supplies up to 90 volts, the LC57 to at least 100. These motors do not ever have a loss of home=a layer shift.
I have 5 of them in service ATM on cnc machinery in the garage. If they lose home, they have an output that can stop lcnc in about a millisecond as they will use every amp the supply can make to prevent that, if the error is not reduced they shut the motor off to save both the motor, themselves and the supply. Tested to that level of failure on my Sheldon 11x54 lathe by running a tool into a stopped chuck jaw. Shuts down instantly without damaging the carbide chip in the tool, or marking the chuck jaw. And has yet to fail doing a job in 2 years!
Because they only drive the motor currant at a level that gets the job done, they draw far less power in normal operation, only heating the motor if pushing it really hard, a power savings you can see in your monthly power bill. Applying this new tech to a 3d printer s/b interesting. Out in the garage, a PID stage in lcnc is not used, the PID is in the controller/driver, and they do exactly what the trajectory planner tells then to do, potentially at 10x or more the speeds what that printer ran well at when new with only 24 volts to move the motors.
Whats not to love?
That would enable driving big motors with high power external drivers.
That is the point of my Ender5plus rebuild. I think I am about done with the wiring. I powered it today for the first time in about a year as I decided to put its new BTT Octopus Pro V1.1 controller in the top of a side for access w/o having to rig a hoist and skyhook to turn it over for access to the bottom. Quite a few mechanical mods have been made to it also. It lost much of a pound of X axis weight with carbon fiber and linear bearings. Y axis drive with that puny motor in the middle of an 8mm shaft is now 1" carbon fiber tube belt driven from a nema23 stepper/servo. Z screws now driven by one mslightly bigger motor, bed tilt adjustable.
More as I configure it and bring in to life.
On Monday, April 15, 2024 at 03:55:49 PM MDT, gene heskett <ghesk...@shentel.net> wrote: I'm running into the same problem in 3d printers, Peter. I am currently rebuilding an Ender5+ using the new stepper/servo drives from hanpose, that are rated for up to 90 volts for the nema 17 motors used on most printers. Most of the big tree tech controller boards use 1.5 micro-sec step pulses, but I am finding I need to stretch that to 2 micro-secs if I don't want an occasional miss, this while driving the lc42 driver. These drivers all have opto inputs, and need a little longer step on the less than 5 volt signals. _______________________________________________ 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
