Crawlbot Questions

"I have started to reach out to the TinyG/Chilipeppr community to get it running via Chilipeppr. I'd still like to figure out why I cannot connect the Printrbot CNC app. I'm running now with Chilipeppr...but some questions.

Do you guys have a cheat sheet for feeds and speeds that you have been using on the various materials you have been cutting?

So I've noticed that when I home the machine and start a cut from the home position, alarms are triggered from the router head touching the endstops when it comes around for a full pass. Is it best to not set machine zero to work zero?

How many other Crawlbots are out there? I can't really find any resources for it, do you have any sort of documentation for it?

There is mention of a larger table one could make to cut full 4' by 8' sheets, is that available anywhere?" -Andy

 

 

Thanks for your patience Andy. I have copy/pasted some info from your email thread to this support request, in case anyone else needs to view it later.

  • Connection: Nick, our resident Crawlbot expert has not experienced any connection issues to date. Of course, we are exclusively Mac at our shop. I understand you are on Windows 10. I have seen a couple instances of connection issues with the Crawlbot. I know the 'power cycle' approach is not a novel approach. However, that has been the most effective solution to the few cases I have seen.
    • Close the Printrbot CNC App
    • Close your web browser
    • Power off the Crawlbot and let it sit for 60 seconds
    • Power the Crawlbot back on
    • Open your web browser back up
    • Open and log into the CNC App

 

  • Materials Cheat Sheet: There is no 'cheat sheet' for material settings that I am aware of. There are some tutorials at printrbot.com/crawlbot that cover Fusion 360 settings, but most of those are for plywood.

 

  • 'Is it best to not set machine zero to work zero?' In short, you do make things easier on yourself if you do not set the machine to work zero to zero. If you are going to cut along the edge of the capacity of the Crawlbot, be sure that you set the origin point on the outer corner (front left) of the file. If the origin point is set in the center of the file and 'home' is set at the corner of the cutting surface, the mill will try to cut outside of the cutting surface - triggering the end stops.

 

  • 'How Many Crawlbots are out there?' The Crawlbot is a relatively new product. There are only a handful (~10-20) in the wild. All of the available documentation can be found at printrbot.com/crawlbot.

 

I hope that is helpful,
Dave -pb

 

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11 Comments

  • 0
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    Tedwards

    We are among one of the first (I think) to introduce a crawlbot into a school makerspace. My class is getting excited about flatpacked furniture design, but we don't have much to go on. We've worked through some of the Fusion360 tutorials, but I would love if PrintrBot posted some help on getting started.

    In particular I think a tutorial on how to get started cutting designs from OpenDesk.cc would be a FANTASTIC way to get people making quickly. Help please??

  • 0
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    Stefano Pagani

    @Tedwards Look at https://www.youtube.com/watch?v=aHoO6ptXdM8 and slow it to half speed. It helped me. Also use http://chilipeppr.com/tinyg instead of the Printrbot app.

  • 0
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    Tedwards

    Thanks so much, Stefano. I've seen the video, and it definitely helps with set up. It leaves out the process of going from 2D dxf file to 3D, though. Did you just clean up the dxf and extrude to 18mm (stock size)?

     

    I'm really excited to try Chilipeppr! I've not been very impressed with the Printrbot app.

  • 0
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    Sam Morgan

    @Tedwards To go from an OpenDesk DXF file to 3D, there are several things to consider. The files will generally have multiple sketches in them, and a bunch of extra things you don't need, such as instructional text. I get rid of as much unnecessary extra garbage as possible after importing to Fusion 360 as the first step.

    Second thing to do is really take a look at the sketch and try to understand what's going on. Also look at the build instruction PDF so you can understand how the parts are supposed to look and go together. Then you can just start selecting the sketches and extruding.

    The first thing you want to push/pull is the outer contour sketch, this will usually be labeled 18mm and is the sketch that will correspond to the outlines of each major piece. After that, you can push/pull each sketch to the specified depth as cuts (removing "material" from the first contour).

    This is just the basic way to get started, and won't result in the best fit. I suggest looking into parametric design so that fitment will be perfect after cut.

    Edited by Sam Morgan
  • 0
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    Marc

    Hello,

    I have bought a Crawlbot few month ago and since then I was never able to mill a decent job. Countless reboots to connect to the TinyG (with the Printrbot app as well as Chilipeppr), and when finally succeeding to connect, I don't count all strange G-code behavior as Z axis not raised enough on fast travels or square path running with an angle, ruining my piece and often the mill (no problems on other CNC with the same code but different controllers), not to mention the horrible GUI.

    So I decided to trash the crappy piece of softwares available for the TinyG and the board itself and replace it by a more professional SmoothStepper board and a bunch of Gecko drives, using Mach3 to control the machine (horrible GUI too I admit, but workable). I am in the process of rewiring all the Crawlbot to host the new electronics, but I wish to know which settings I have to use for Mach3 (displacement per step, acceleration...). I can trial and error it until I get it right but it will save me time and tools to get theses infos. So please PB support, help me !

  • 0
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    Vincent Colombo

    For anyone who is interested, I started a Crawlbot User's group on Facebook: https://www.facebook.com/groups/177272666019933/

  • 0
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    PB Support Team

    Nice Vincent.  We will spread the word!

  • 0
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    scotts

    In the interest of open community, would PB be willing to share any of the Fusion design files or perhaps step equalivents? In particular I'd really like to design a better dust collection and having the router mounting bracket to design around would be so very handy.

  • 0
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    Stefano Pagani

    @Scotts I have asked before for a STEP file for the dust collector, Sam said they could only provide the stl. I have it in a fusion project. I can invite you, just send me your email.

  • 0
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    scotts

    That would be useful though what I was after was not their dust collector design, but rather was hoping that they had modeled the Makita router and bottom bracket so I could design one that works from scratch (pulling saw dust up and by the collet is not very good).

    email is: scotts at pobox dot com

  • 0
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    Scott naylor

    What are the factory setting or recommended setting in tinyg when the crawlbot is shipped?
    It would be good to have as a reference when troubleshooting
    Thanks

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