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  1. Re: Smoothieboard, new opensource, ARM 32 bits ( Cortex-M3 ) CNC controller board

    Someone sent me a PM asking about this product for their specific use so I took the time to examine it closely

    While I think this is a really neat product with some great potential, for anything...
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    Re: 6amp 60v 10 microstep bipolar drive

    Working from a dev-board is a good starting place as you can move pins around easier than remaking a PCB.

    Do you have a working driver with good results or just getting the code working on the...
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    Re: Open source low cost servomotor controller

    I've been manipulated into accepting the following concept, there is little difference from a machine for hobby use and a machine for commercial/production use, I should expect the same performance,...
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    Re: Open source low cost servomotor controller

    I offered the OP an opportunity to produce boards at 1/2 the current cost, he rejected the offer so if you want to complain about the price complain to him, it was his decision to use an expensive...
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    Re: Open source low cost servomotor controller

    At least a reply worth responding to.

    Yes it's his project and he's the only real developer involved in it and mostly for the reasons I stated.

    I'm in no rush, I have all the time in the world,...
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    Re: 6amp 60v 10 microstep bipolar drive

    I have no interest in Mariss or the G251X when it's not a usable solution.

    Put peoples efforts down???

    What efforts are you talking about???

    If you mean efforts in the way of pictures that...
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    Re: Open source low cost servomotor controller

    VESC isn't really suitable as a servo driver for CNC applications when the firmware still needs considerable development for positioning..

    The purpose of open source is to aid rapid development by...
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    Re: Open source low cost servomotor controller

    Being tied to an expensive manufacturing process and the lack of files to produce the board at other board shops makes this project look less like an open-source project.

    Like many others I am...
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    Re: 6amp 60v 10 microstep bipolar drive

    As much as I hate to say it, this project is just not suitable for any real use purpose since there does not appear to be a complete set of eagle files in which the board can be produced from.
    ...
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    Re: 6amp 60v 10 microstep bipolar drive

    The EPM240T100 (C5N or I5N) I'm told is an inexpensive and suitable FPGA for this kind of project, do you have eagle files for this?

    A set of eagle files that will produce a board and code that...
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    Re: 6amp 60v 10 microstep bipolar drive

    Do you have eagle files and code that use this FPGA?


    If not, advising it isn't helpful unless you making the schematic in eagle, building a couple of samples, tweaking your code to perfection...
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    Re: 6amp 60v 10 microstep bipolar drive

    Sometimes it's worthwhile to pay a few extra dollars to get something that's a step above the rest without getting into a commercial price-tag, finding a suitable 10microstep driver is one of those...
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    Re: 6amp 60v 10 microstep bipolar drive

    [QUOTE=yngndrw;1983570]Sorry I meant the G250, don't know why I said G540. They are indeed a single H-Bridge so I mount two to a single heatsink. (Just using a cheap used CPU heatsink as they are a...
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    Re: 6amp 60v 10 microstep bipolar drive

    Here's an updated board layout with SMD for all but the TO220 components and the electrolytic capacitor, trace sizes have been increased where applicable and has been tested to support 8A without any...
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    Re: 6amp 60v 10 microstep bipolar drive

    You've got three of the entire 6A@60V drivers in your G540 or just three of the H-Bridges?

    From looking at your H-Bridge board, it's only dual and with steppers you need quads so I fail to see how...
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    Re: 6amp 60v 10 microstep bipolar drive

    The TO262 version must mount with the tab against the PCB, in the updated board, they are mounted on the bottom but the tab is away from the PCB (the body contacts the PCB) and the PCB sandwiches it...
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    Re: 6amp 60v 10 microstep bipolar drive

    Your files have been updated.

    Some of the changes:
    Modified some part footprints.
    Swapped fets for less heat.
    Removed GND traces and added ground plane for better voltage and current...
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    Re: 6amp 60v 10 microstep bipolar drive

    You post with the zip file has your eagle board file but is missing the eagle schematic file, surely you're not suggesting I make extensive modifications to your eagle board file without the...
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    Re: Open source low cost servomotor controller

    Precision and tolerance in the hobby market is a byproduct of time, effort and finances but you can achieve more than acceptable tolerance, resolution and repeatability just by component selection...
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    Re: Open source low cost servomotor controller

    A couple of nice choices in your motor list I see and the 50-50 580kv and the 50-60 270kv are worth testing to determine suitability for operation at 24V.
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    Re: Open source low cost servomotor controller

    When I was told the HP was in spec and it was suggested the RPM was acceptable even though it exceeded it by 20%, stopping abruptly with this pulley was more than it could handle.
    it's since been...
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    Re: Open source low cost servomotor controller

    A GT3-15 belt is a 3mm pitch timining belt, following advice from someone else just like you who emphatically claimed the belt would stand up to a 3HP, 8,000RPM motor and would handle moving a 8' x...
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    Re: Open source low cost servomotor controller

    I never thought to take pictures of the exploded pulley and there didn't seem to be any point in keeping it around so it was tossed at the time of replacement.

    The 26LV31E is a line driver with...
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    Re: Open source low cost servomotor controller

    A china factory is now cloning the Tamagwa 16,000RPM 2500PPR quadrature encoder for one of my works customers at a cost of $26.50/ea but come in a box of 24 so a cheap source is available if you need...
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    Re: Help configuring GRBL Settings in new Setup

    I can understand getting stepper motors with the correct shaft DIA to be a direct replacement would require custom motor fabrication, luckily many china vendors are willing to make such...
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    Re: Help configuring GRBL Settings in new Setup

    It's a shame that arduino GRBL doesn't have cutter compensation or canned/drilling cycles because that Advantage Router 600 (AR600) is one of the better CNC router machine frames.

    If you can live...
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    Re: 6amp 60v 10 microstep bipolar drive

    Are you going to be attaching them any time soon?
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    Re: Open source low cost servomotor controller

    I think you need to re-examine your statement about stretch and precision unless you are moving a table with almost no weight or moving it so slowly that it's weight doesn't interfere.

    You can be...
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    Re: Open source low cost servomotor controller

    I pulled the prop off my china Aerodrive SK3 6364-245kv clone and attached it to my dyno, the motor is 2.7KW/245KV output power (input power = max 37VDC@70A) and spins at 40KRPM no load at 32V/15.8A...
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    Re: Open source low cost servomotor controller

    The last encoder is intended for use on a large inertia <3,500RPM keyed shaft motor where the shaft DIA is >30mm or for example belt driven from a lathe spindle.





    3oz copper PCB isn't...
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