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4DThinker

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About 4DThinker

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    Apprentice

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  • My Location
    Manhattan KS
  • My skill level is
    Advanced

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  1. I'm using ball screws and linear rails on all three axes. I started with a tinyG controller and steppers from an unused X-carve kit. I have the whole CNC assembled, and it turns out the steppers don't have enough torque to turn the Y axis without losing steps. I bought larger steppers which I thought would work but the tinyG doesn't have enough oomph to turn all three axes (4 steppers) at the same time without complaining. I like the tinyG as it has great acceleration/deceleration routines built in, but apparently isn't powerful enough on its own. So I'm stalled at the moment. I need a controller+driver combination, preferably something with included controller software. 4D
  2. 4DThinker

    Tool Changer Survey.

    Old thread I know, but awhile back Probotix teased a tool changer as a potential option for their CNCs. I'm not sure how they could implement one with their current design, but that doesn't mean they aren't working on a solution. I've been contemplating strategies to swap out the whole router (trim routers are cheaper than some tool changer assemblies) with different bits installed. But then I look at how much trouble it is (isn't?) to separate toolpath files by bit used, change bits for each file, zero the new bit before loading and running the new file, etc.. I've concluded it is a welcome break in the process, where some quiet is regained and some different muscles can be used. It also eliminates worry in letting the CNC travel over to pick up a tool where it might crash though clamps on the way. Yes, some time might be saved in a repetitive production setting, but fortunately my little shop is far from that. 4D
  3. 4DThinker

    All A Yall Know Bout This

    Nothing wrong with UPS advice. They typically have a battery in them, and that battery will wear out eventually. When it does the UPS is worthless and will need replacing. Just keep an eye on any you use. 4D
  4. 4DThinker

    Projects?

    My CNC is (not so) busy lately cutting out the parts for another CNC. I sense it resents doing the work with suspicions of being replaced, but in reality I'm just making a companion for it to keep it company when I'm not home. The old Shark that lives in my garage is awaiting warmer days to find something to do. 4D
  5. 4DThinker

    Fairy Tree Or Gnome Home In Your Forest

    Now if only the scene would change each night (door or window open or closed), and unusual sounds could be heard coming from the tree (gnome activity) and all would go quite if you get too close. Excellent work as usual! 4D
  6. Update. Old thread I know. Probotix eventually got back to me with a $200 discount on a V90-spoilboard-monitor/keyboard/mouse. By that time though I'd already started collecting parts to build my own small CNC. 90% of the parts have arrived, and I have raw materials to start on a plywood prototype. My design process requires critical evaluation of existing designs (like the V90) and iterating through variations looking for any improvements I could make. I'm using linear rails rather than round bars, and looking into mounting matched pairs (left and right Y rails, top on bottom X rails on the gantry beam) at 90 degrees opposed. One on top and one the face of the gantry beam rather than one on top and one on bottom. Y axis rails leaning in at 45 degrees rather than vertical. My thinking is that as angle iron is stiffer than flat bar, having these pairs of rails in right angle planes should help cancel out any play either might have. I puzzle on. 4D
  7. 4DThinker

    Looking for recommendations

    Hi Joey, For 15k or less you might contact Len (at) Probotix.com. The last I talked with him (He is the owner of that company) they had been working on making a 5x9 machine for a client, and although their prices may be higher now the last quote I heard for one of these large machines was right around 10k. 4D
  8. Probotix got back to me and said they were so busy filling out year end orders that they didn't have time to send me a quote for my "custom" order. That was back on Jan 5th. College classes start up again next week and that mean I may forget about this project until summer comes. 4D
  9. Well, I decided to go ahead and order a V90MK2 from Probotix if they can configure it how I want them to. A Christmas gift to myself, perhaps. I don't need their MDF bed, a router mount, or PC peripherals (monitor, keyboard, mouse or game controller). I do want their taller gantry sides and the 60mm x 60mm gantry beam. I'll likely rebuild the Z axis to maximize it's stiffness and minimize how much of it cantilevers off the gantry beam. I'm also toying with ideas for how to make the mounting height off the floor adjustable. So far my best idea is to mount the frame on two arms that cantilever off two vertical 2x6 posts where I've mounted heavy duty drawer slides vertically. A counterweight or bungee cords should easy moving it up when needed to cut joinery on the ends of long bed or sofa rails. I'll add some secure way to lock it at any height within the slide range. I sent Probotix a request for a quote. I don't expect to hear from them until after Jan 1. Shipping should hopefully be much less than it was for my meteor. the V90Mk2 is much smaller and will be much lighter than my Meteor was, especially with no MDF bed or monitor in the crate. 4D
  10. 4DThinker

    Super trivet

    Super job on a super idea! 4D
  11. 4DThinker

    Need Help from Probotix Users

    It has been awhile since I went through the re-install, but I seem to remember just holding the F2 key down while I turned on the PC. Otherwise the existing OS would start to boot up. Sorry I can't be more helpful. I know personally the aggravation when a tool I depend on is down for repairs.
  12. 4DThinker

    Joinery fit precision

    This coming week is the last week of classes for the Fall semester 2017. As is typical, I'm getting a rush of requests for CNC work from desperate students. One of the more challenging requests is shown below. The legs are for a small table. Already cut as 2-side 3D files on our CNCs, the notch in the top couldn't be cut with the part lying flat. The only workable approach is from the top. I've carefully clamped the leg onto my variable angle clamping fixture. I used a digital angle gauge to tilt the fixture 1.45 degrees, which is the side taper of the legs. Then I had to clamp the leg to the fixture in the vertical position it will be in when assembled. I added blocking around the shape so once I've got the first leg cut I can simply swap in the next 3 which need the same pocket cut. The notch they need is a simple 90 degree corner so the legs can be bolted to the corners of her table frame. Repeatable clamping and toolpath alignment are the critical requirements here. I have the toolpath ready, but haven't yet gotten up the nerve to cut the first one. It is hard to tell where the center from the fixture is. I'm just not yet sure I've picked the best origin point to set for the toolpath. I'll post a results photo once I've finished cutting one good one. 4D
  13. 4DThinker

    Need Help from Probotix Users

    Password are typically probotix as username and probotix as password. If you can't get back to a working screen then it might be worth doing a reinstall of the OS and LinuxCNC. The needed files are available on Probotix' wiki page. Not a simple fix, as you'll also need to run their configurator to set linuxCNC up again for your specific machine. Links: http://www.probotix.com/wiki/index.php/Reinstalling_LinuxCNC_on_Galaxy_Series_Machines http://www.probotix.com/wiki/index.php/NEW_LinuxCNC_Configuration 4D
  14. 4DThinker

    CNC Purchase or Build

    Old post, I know. I just thought I'd add an update that I'm now located in a new fabrication lab where I have easy access to a large CNC that can cut aluminum. We also have a large plasma CNC. Our college budget is strapped at the moment, but I can likely convince the lab manager that my Z-axis revision is worth investing in. He is already aware of the weaknesses in the current configuration. We may be able to make parts to assemble at least one for our nebula over the Christmas break between semesters. 4D
  15. 4DThinker

    Three crosses trivet

    Well done! Beautiful. 4D

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