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V-Slot Lead Screw / ACME Driven Accators

Discussion in 'Other Builds' started by Mark Carew, Mar 28, 2014.

  1. Mark Carew

    Mark Carew OpenBuilds Team
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    kram242 published a new build:

    Read more about this build...
     
  2. Tweakie

    Tweakie OpenBuilds Team
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    Excellent - they just are so neat. :thumbsup:

    Tweakie.
     
    Mark Carew likes this.
  3. Mark Carew

    Mark Carew OpenBuilds Team
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    Thanks Tweakie :) I hope it helps to spark ideas for new projects
     
  4. Will

    Will New
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    Mark,

    I need to build a 4-axis foam cutter. I was planning to build something like what you've done here. I want to use ACME 1/2 screws and NEMA23 motors. You have everything needed, but only in NEMA17 size. Any change you can make NEMA23 sized parts? Great site. Great ideas.

    Will
     
  5. Mark Carew

    Mark Carew OpenBuilds Team
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    Hi Will thank you and welcome to OpenBuilds :thumbsup:
    I have not posted it as a build yet, but I started a simple two tower hotwire cutter that uses NEMA 17 since there is no real forces for hot wire foam cutting I would think there would be no need for the 23's unless its a very BIG hotwire :)
    But to answer your question, Yes OpenBuilds part store is working into having more NEMA 23 related parts for larger stronger builds.
    Vslot HotWire_2.jpg
     
  6. Will

    Will New
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    Mark,

    Yeah, no doubt NEMA17 is capable of the average foam cutter. I am looking for a 24" x 16" cutting area. I think most people forget that speed is your enemy when it comes to cutting foam...at least to an extent. I will design the parts and pass it on.

    Will
     
  7. Mark Carew

    Mark Carew OpenBuilds Team
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  8. Veej

    Veej New
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  9. Mark Carew

    Mark Carew OpenBuilds Team
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    Hi @Veej
    Did you download the example model file? That's the best way to get an idea on how you want to start your build. There are many ways to go about making a build like this and the example models should give you a good start.
    Hope this helps
     
  10. Veej

    Veej New
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    Yes I have and I do like both the approaches; one where the lead screw is from the motor to the other end and one where the lead screw does not go the full length of the V slot rail. The questions is if one is more robust than the other? If it is the first one, will the threaded motor mount plate holding the end of the lead screw come in the way for attaching a perpendicular V slot rail?
    If I follow the second design, this should not be the problem though.
    Just want to be sure before I order parts since this is my first time!
     
  11. Mark Carew

    Mark Carew OpenBuilds Team
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    Hi @Veej
    NP bro this is what its all about :)
    There should be no difference as the robust will come from how well the cart is mounted to the rail not the lead screw. The main advantage of having the bearing plate (threaded rod plate) on the opposite end is for longer runs of the threaded rod so that when turning at high speeds it helps to keep the end from whipping around. on short runs or slower truing machines (hotwire cutter) this will not be an issue. Real world experimentation on what works best for your design is really the best way to see if it will do what you want.
     
  12. Veej

    Veej New
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    Thank you so much for the clarification. Even though my application does not require fast movement, I think it will be best to go with the full length lead solution. I'll mount the V slot rail that is going to be perpendicular to the mechanism on the back side at the bearing plate end. I believe Universal L brackets should work for a robust mount. If you have other suggestions, please let me know.
    Thanks for all your help.
     
  13. Mark Carew

    Mark Carew OpenBuilds Team
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    Sounds good Veej, if you sketch it up we can all take a look and send some ideas your way for sure :thumbsup:
     
  14. rtfm

    rtfm New
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    Hi,
    Sorry to butt in on this (dormant) thread - but I thought it a waste to start an identical one.

    I am an aircraft designer/builder (full size and RC), and I'm sick and tired of buggering up airfoils on my gravity-fed hotwire system. I know other guys seem to produce perfect airfoils with these sorts of systems, but not me. So I thought I'd look into CNC hotwiring them. At first I hit all the big ticket items and ALMOST gave up till I stumbled on the Phlatprinter which fascinated me. And then I found your site. And then saw all your great builds.

    My favorite so far is the OX. But I only need a hotwire system, which means two Z-towers and 2 X-rails. So I got to thinking I could build a simplified OX with two towers and no Y-gantry. I guess I could - but now I see you're working on a genuine 4-axis hotwire which is GREAT. My only (?) issue is that I need to cut wing cores with chords of 1100mm (X-axis). So I would need something with at least that amount of travel. Z-axis requirements are minimal (a 1100mm airfoil is only 165mm high...)

    Any advice? Having re-read this post, I think I should have posted it elsewhere, but I'm happy that I got it down, at least...

    I'm based in Brisbane, so it would mean ordering all the parts from Perth, but even though that is ALMOST another country, it is a lot easier than ordering from the US...

    Regards, and looking forward to hearing from you.

    Duncan
     
    #14 rtfm, Jul 18, 2014
    Last edited: Jul 18, 2014
  15. JustinTime

    JustinTime Master
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    Duncan, a foam cutter is really easy to build. In your case I would use two 1000mm rails on each side for a total of 2000mm. You'll probably end up using all of it to get your 1100mm cutting length. You will have to use four stepper with four individual driver and four drive axis but that is all standard and no problem at all.
     
  16. mikea202

    mikea202 New
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    I built an x axis similar to the image above but I am having an issue and could use some advice. I can't seem to get the alignment of the lead screw and post on motor correct. when I tighten the motor mount bracket, the carriage won't move smoothly but if I loosen it, then I get a wobbly motion in the bracket. Any suggestions?

    Also, the Nema 17 motor doesn't seem to have any real torque. Is that to be expected with that size?

    Thanks in advance.
     
  17. JustinTime

    JustinTime Master
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    mikea, did you try some washers under the motor or the motor mount?
     
  18. tarheelbandb

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    Build list seems incorrect. You need the 40mm aluminum spacers in order to use the 45mm screws. Not the 1.5 inch spacers
     
  19. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    Nope, it's correct. The screw has to pass through a 3mm plate first. With the 1.5 inch spacer this leaves 3.9mm of thread to connect into the motor. The 40mm spacers would only leave 2mm which is a bit short.
     
  20. John DeMita

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    Can someone from OpenBuilds let me know when the full NEMA 17 kit (bundle) will be back in stock?

    I can see that just two of the bundle components are not in stock, but the in-stock date for these has changed from today to unknown.

    Thank you...
     
  21. Mark Carew

    Mark Carew OpenBuilds Team
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    Hello John. We are working hard to restock the parts needed to complete the Bundle. The current ETA is within a week. If you would like to place a pre-order, please contact the OpenBuilds Part Store at contact@openbuildspartstore.com and they'll be happy to help.
    Thank you for your support :thumbsup:
     

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