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Type: Posts; User: PropellerHat

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  1. Re: Still soft surface cast after half a year of standing idle

    I actually did a test cast with the same stuff before, and using the same resin that had been more than a half a year standing, forming lumps, might have been the mistake. Beware of lumps, where ever...
  2. Re: Still soft surface cast after half a year of standing idle

    So to use big surface area against the epoxy? Darn, I was especially planning to use it as a direct mount table, with resin printed disposable standoffs (that for the cost should be as small as...
  3. Re: Still soft surface cast after half a year of standing idle

    Yeah I casted it in last summer :(

    Anybody knows how to peel the stuff off? Angle grinder?
  4. Re: Still soft surface cast after half a year of standing idle

    Hi

    I used this one:
    https://kandydip.de/ecom/prestashop/epoxidharz-dipon/3993-epoxyplast-3d-b50-deep-pour-resin-ultra-diamond-clear-anti-uv-epoxidharz-i-epoxy-resin-diponr.html

    I weighed the...
  5. Still soft surface cast after half a year of standing idle

    Hi gurus

    As the topic tells, my machine base looks like a failure. I finally have managed to have time to fix several skull crushing out-of-nowhere issues after making the extremely laborious EG...
  6. Re: micromaster 440 grounding and other weird issues

    Hi

    Thanks, it was easy on my part.

    Yesterday I managed to adjust the new VFD to run the spindle properly, so the spindle is fine even though I started to wonder if that too is faulty.

    The...
  7. Re: micromaster 440 grounding and other weird issues

    https://www.cnczone.com/forums/attachment.php?attachmentid=475330&stc=1Hi again

    Sorry for the delay but I was down due to Covid.

    Here is a photo of the nameplate, and the problem shooting...
  8. Re: micromaster 440 grounding and other weird issues

    Oh dear, hopefully I didn´t ruin the Siemens. I thought a quality product would have protection against poor settings. I have been poking them but honestly the user interface is quite complicated,...
  9. Re: micromaster 440 grounding and other weird issues

    Yep, the only professional component in my hobby CNC :D

    Yesterday managed to put in action the new el Cheapo vfd just to notice that the problems remain. As long as I had the spindle attached to...
  10. Re: micromaster 440 grounding and other weird issues

    Yeah, it is a VFD to drive a spindle. Wiring checked and rebuilt. Also, I pulled the unit out and connected it only to the mains, and the potential in ground cable remained. Differential unlatched...
  11. micromaster 440 grounding and other weird issues

    Hi

    I have a 1,5Kw M440 in my selfmade cnc and it causes crazy problems out of blue now. Basically the machine has been a while unusable because when ever I enable the spindle (by connecting after...
  12. Re: Shattered tempered glass instead of gravel

    Hi Peteeng

    With "pullup" I mean the amount the epoxy is pulled up the inserts because of its´ surface tension. The resin I used is slow, 72hrs to get solid. And after that it still feels elastic....
  13. Re: Shattered tempered glass instead of gravel

    Oh I forgot completely to update the string!

    Here it is, ready. I had horrible difficulties to remove the mold because of being lazy and stupid with trying out teflon spray instead of wax as a...
  14. Re: Shattered tempered glass instead of gravel

    Hi

    Was the site down globally or how come I couldn´t load it for many days...

    Yeah , The pieces are very similar in size indeed. I found some pool filter "Glass sand" from local hardware store...
  15. Shattered tempered glass instead of gravel

    Hi

    I have hard time sourcing the necessary grades of sand and gravel for my very simple tabletop EG build (especially as I don´t drive and live in a city far from this sort of industry), and was...
  16. Re: searching: DIY 150w CO2 laser cutter everything else but motion mechanics

    I live in Barcelona, Spain. Yeah I found some cheapo compressor chillers in Amazon, don´t want to order that big stuff from China because it will certainly get stuck in the customs.

    Could I get...
  17. searching: DIY 150w CO2 laser cutter everything else but motion mechanics

    Hi

    I am dreaming of building a laser cutter able to cut through about 10mm of PMMA or similar. I have built several big 3D printers and a CNC for milling aluminium and feel confident about...
  18. Siemens MM440 kicking the spindle in full speed when the control voltage at 0

    Hi

    I have a weird problem that started the last time I was using my DIY CNC. I have a raspberry Pi controlled machine and a PWM to analog 0-10v gizmo. Last night at the workshop the spindle didn't...
  19. Replies
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    4,786

    Re: Epoxy granite but graphite?

    Graphite is soft.
  20. Re: Bad Limit Switches causing random behaviour

    OK, thanks. I am looking for Telemechanique psn - det 61 11 switches now, 1 ordered and tomorrow I can try it out. If it´s no good I´ll probably do 3D printer sort of flingy but precise solution with...
  21. Bad Limit Switches causing random behaviour

    Hi

    I have been struggling with my Mill-Router hybrid´s end switches for a couple of days and after trying a lot of different tricks ended up pulling apart one of the switches I planned to use....
  22. Pls read before answering. I put 20mm already,...

    Pls read before answering. I put 20mm already, and I know what it means. What is a mystery is how to fix it.
  23. GRBL alarm 8 after the first hit on X limit switch

    Hi yall!

    I have tried for hours to solve this nut scratcher:

    When homing Z does fine. X gets alarm 8 (failure to clear the endstop) after the first, faster search. I have them set normally...
  24. Face mill (?) to 1,5Kw ER20 spindle for aluminium planing

    Hi

    Is there (affordable) options to get a nice surface finish on aluminium with these mentioned spindle details? (it is a Teknomotor)

    I am dreaming of an insert type face mill but honestly have...
  25. Replies
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    2,841

    Re: Screw diameter and strenght relation

    Thanks peteeng, this was a lot of good info. Yeah I guess if one of the screws was more efficient the less efficient one would have to get a lot hotter.

    Obviously the main benefit of a big screw...
  26. Replies
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    2,841

    Re: Screw diameter and strenght relation

    Maybe I should reformulate the question...

    Imagine 2 different 5mm pitch screws, one 16mm diameter and the other 25mm, both pushing a load of let´s say 500Kgf, slowly (no effect of inertia) and...
  27. Re: "spindle guard" instead of an enclosure, or something else maybe?

    Yeah, an enclosure would be the real solution but I´m short on funds and space. The irritating part of enclosing a mill is that there are these protruding parts like the steppers in the ends of the...
  28. "spindle guard" instead of an enclosure, or something else maybe?

    Hi

    I am building my first mill (40mm series extrusion frame) and I would like to skip building a huge and expensive box around it. How to protect myself from the bits breaking and flying like...
  29. Replies
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    2,841

    Re: Screw diameter and strenght relation

    Thanks for profound replies.

    I am building a machine but this is not really a question for that, more "just a thought" as I stumbled upon the fact that pushing a load uphill on a steeper climb...
  30. Replies
    13
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    2,841

    Re: Screw diameter and strenght relation

    Hmmm... Not convinced in here.

    Sure a big one is sturdy but that's not my question.
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