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Type: Posts; User: jschoch

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    3d touch probe testing questions

    I had an idea about using velostat for making a 3d touch probe and finally tried it out today and it works in principal! It is simple to construct and costs less than $5 in parts. It is essentially...
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    Re: box ways for pcb mill z axis

    I found this great project which has a really nice rack and pinion design.

    I was a bit skeptical on how easy this would be to re-create but the initial results are impressive and I'm going to be...
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    idlers and shaft support

    I'm wondering if supporting both sides of a shaft is the best way to go or if using an idler bolt or relying on the motor bearings better. It seems that unsupported idlers are very common in 3d...
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    Re: Software & Breakout board question

    For those who like to tinker and learn I think the grbl/g2core/linuxCNC path is better.

    For those who don't want to dig deep and have something else to learn (something else to go wrong) then...
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    Re: Software & Breakout board question

    Jfong, did you ever get a g2core test going? I want to check out the s-curve motion but i was not able to find a gcode sender for it that worked well and the lack of saving of settings on a due was...
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    Re: Software & Breakout board question

    if you are comfortable with electronics check out bart dring's esp32 port and board for grbl. You can get the board on tindie or make it yourself. it can do wireless and it also has a few extra...
  7. Re: Thoughts on cnc converted MH22 for hobbyist ...

    I also suffer from this condition. I found my self researching strain gauges, HX711 amps, load cells and eventually velostat last night as a tangent from a diy tool setter!
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    Re: box ways for pcb mill z axis

    Here is my progress so far. It has worked out well and I think the box ways will out perform the round rails and the lead screw. Once I complete the frame i can tackle the electronics and belts.
    ...
  9. Thread: cup probe

    by jschoch
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    Re: cup probe

    I wonder why they use a puck vs some other topology?
  10. Thread: cup probe

    by jschoch
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    Re: cup probe

    you could locate it on the table or the part. the tool would touch the cup at the top. The location would be found via hole center finding which needs any 3 points. The 2 flute cutter may not...
  11. Thread: cup probe

    by jschoch
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    Re: cup probe

    something like this


    https://www.cnczone.com/forums/attachment.php?attachmentid=408906&stc=1https://www.cnczone.com/forums/attachment.php?attachmentid=408908&stc=1
  12. Thread: cup probe

    by jschoch
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    cup probe

    I'm wondering if there is a probe design that is essentially an inverted 3 ball probe design with a cup on the end of the probe. The idea of the cup is that you could get x/y position finding "hole...
  13. Re: Some advices for my CNC router build = Appreciating!

    I'm not so sure I agree with this as an absolute. You can drive a 1605 with nema 23 440oz/in direct drive and get 2000 mm/m if you don't belt/gear reduce and rather direct drive them. This speed is...
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    Re: work with what you got build

    Ok, i've been limping along with my machine for a while and I have not had large enough blocks of time available to make improvements, however it works and so I trying to not "improve" it into a non...
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    Re: box ways for pcb mill z axis

    I did some tests last night on a mdf torsion beam I made for this pcb mill. It was constructed with 1/2" mdf skin and .2mm plywood torsion braces. the dimensions were 400x80x80. I measured around...
  16. Thread: DIY box ways

    by jschoch
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    Re: DIY box ways

    I was able to get the spindle mounted and moving. If I set a 123 block on the spindle I get about 0.005 mm deflection. If I plug in a 0.8mm cutter and .2 mm depth of cut at 12k rpm on fswizard I...
  17. Thread: DIY box ways

    by jschoch
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    DIY box ways

    I started another thread to ask a question in the PCB milling forum however I think my testing deserves it's own thread over here.

    I was working on a dedicated mill for doing PCBs and I was...
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    Re: box ways for pcb mill z axis

    I think the taper adjustment is easy as long as the taper is longer than the ways. A simple washer seems like it would work.

    Here is a sketch i did.
    ...
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    Re: box ways for pcb mill z axis

    my previous video received some great comments and it was suggested that Rulon XL be used (PTFE). I may order a small chunk since I do not have any onhand. I also want to test out Acetal. I have...
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    Re: box ways for pcb mill z axis

    I made a prototype.

    https://youtu.be/jvfQ-infxxE


    a ton of questions:

    how much adjustment play is typically needed? I was thinking something like 1 or 2 mm.

    What ratio of lenth to width...
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    Re: box ways for pcb mill z axis

    the advantage is that I can make them. using a rail for 1" travel seems like a waste. I also understand box ways are more rigid and provide better dampening which should help a high speed spindle...
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    box ways for pcb mill z axis

    I was just reading the build thread for the swiss mak and noticed he is using box ways with a polymer insert. I've been considering taking my spare parts from my previous machine builds and building...
  23. Re: Milling PCBs with free software... What's out at the moment?

    I use easyeda.com and use the nightly build named "flatcam 2018".

    Regarding easyeda I've found that 1.6 x 2.5mm pads with .85 mm holes work very well for my .8mm ball end mill. I'm cutting...
  24. Thread: add grounding

    by jschoch
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    Re: add grounding

    If I have continuity on earth to the spindle housing grbl throws a "hard limit" error every time I start the spindle. My limit switches have filters and I'm perplexed as to how to fix the noise...
  25. Thread: add grounding

    by jschoch
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    add grounding

    I bought this spindle from solar.jean on ebay and was wondering how I should try to add grounding to this? The top cap and fan top are both plastic. The screw nearest the spindle mounting plate...
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