Laser etch wood dowel ideas needed

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This topic contains 25 replies, has 7 voices, and was last updated by Profile photo of Leo69 Leo69 5 months, 1 week ago.

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  • #6317
    Profile photo of Curt
    Curt
    Participant

    I had a friend stop over today and really liked the mpcnc and the laser. He has a small side business that he would like his company name etched on a wood dowel. Anyone have any ideas on how to add a new stepper to rotate the dowel after each line etched?
    Curt

    #6321
    Profile photo of vicious1
    vicious1
    Keymaster

    There are a few stepper driven axis on thingiverse, they look like a lathe. You can just substitute that for one of your current axis and have rotation.
    I think it should be just fine. Worse case fusion360 can handle an actual rotating axis but I don’t think you need it with a laser since there is no depth change (if that even matters).

    #6324
    Profile photo of karltinsly
    karltinsly
    Participant

    I am also interested in this (Curt and I seem to share a lot of interests!). This is the only one I’ve found on thingiverse so far: http://www.thingiverse.com/thing:144156. It’s laser cut, but we should be able to do that. The main problem is I’m not sure what to search for. I found this one with a search for “rotational axis”.

    #6351
    Profile photo of Curt
    Curt
    Participant

    @karl
    Thanks for finding this item. like you I do not know what to look for. I think this is close to what I might need but I need something for smaller dowels. (3/8-1/2″ dowels)

    #6354
    Profile photo of vicious1
    vicious1
    Keymaster

    I had something like this in mind.

    http://www.thingiverse.com/thing:1032481

    #6358
    Profile photo of vicious1
    vicious1
    Keymaster

    I don’t think that is complete, sorry. Nothing else is coming up. I guess I have a new project.

    I thought that one had a lathe chuck that fit it and a live end, he must have changed it.

    #6359
    Profile photo of Curt
    Curt
    Participant

    Hmmmmm. Thanks. This gives me a place to start. Curt

    #6391
    Profile photo of Tony
    Tony
    Participant

    Have a look at this forum thread for an idea to use our Y axis motion as a simple 4th axis, no additional stepper motor required. Pretty ingenious idea!

    There are some cool modifications to Bob’s idea further down the thread.

    Bob’s Super Simple 4th Axis

    I can’t wait until someone adapts this idea to work on our MPCNC. I’ve been mulling around a few ideas but don’t have a prototype yet.

    #6393
    Profile photo of vicious1
    vicious1
    Keymaster

    That is so slick I love it.

    #6395
    Profile photo of vicious1
    vicious1
    Keymaster

    So how about using this, http://www.thingiverse.com/thing:624625.

    First off is that too much too complicated? If so we can just make some sort of plate you can screw mount things too instead of clamping.

    Then rig up the gregs wade gears to run it, or I guess to make it really simple custom gears so the steps per mm would not need to be changed in the firmware. Then CAD up a stand to hold the stepper, gears, chuck/plate, done! Then just plug and play. as for the other end it can either be another chuck/plate or 2 bearings v holder to hold the stock since force will only be applied mostly in 1 direction.

    hmm dang it I want to prototype but I have to pack boxes.

    #6398
    Profile photo of Tony
    Tony
    Participant

    I’ve been looking for a reason to make one of those chucks. I think I’ll try to make it work with Bob’s 4th axis idea so I don’t have to incorporate another stepper.

    Also, THANKS for all the work you’ve put into the MPCNC project!

    #6400
    Profile photo of vicious1
    vicious1
    Keymaster

    Glad you enjoy it!

    This might be a really cool add on, can’t wait. I’m sure there will be a few different kinds now. That makes it fun.

    #6402
    Profile photo of Curt
    Curt
    Participant

    Ryan,
    What is the gear ratio for the X & Y axis? I am not sure if I want to start with the files that you linked or the one that Karl linked but I will gear the stepper appropriately to rotate the same distance as my x axis would move for one line.
    I am looking forward to seeing what Tony, Karl and I can come up with!!

    #6403
    Profile photo of vicious1
    vicious1
    Keymaster

    The stepper is set at 200steps/mm, the pulley is 16 teeth.

    #6428
    Profile photo of Leo69
    Leo69
    Participant

    I want to join the 4th axis club too. Saw this on thingiverse. Looks pretty easy to build and modify.

    http://www.thingiverse.com/thing:1156932

    For really small diameters I’d be tempted to just attach an ER-16 collet to a stepper shaft and call it a day.

    #6432
    Profile photo of Farrell Pigg
    Farrell Pigg
    Participant

    When I read this, the first thing I thought of was the eggbot. There have been several interpretations on Thingiverse, and this guy even used Marlin firmware along with a RAMPS board. Of course, the rack and pinion idea is absolutely brilliant too. Please keep us posted on this project!

    #6433
    Profile photo of Curt
    Curt
    Participant

    Here is another one that only uses i stepper
    http://www.thingiverse.com/thing:299018

    #15095
    Profile photo of Jason
    Jason
    Participant

    Going to revive an old thread here but has anyone made any progress on setting one up for the MPCNC?

    #15098
    Profile photo of Curt
    Curt
    Participant

    With help of my buddy who made the request we were able to use a single stepper to turn the dowel. The dowel we are using nearly perfect match up to the belt/gear ratio Ryan set up. I will post some photos of the holder and the dowel after a laser burn. Curt

    #15106
    Profile photo of Jason
    Jason
    Participant

    Interesting… I guess yea every time you use a different sized material your steps would change.

    I would like to add the ability to laser engrave or mill round stock as well.

    #19332
    Profile photo of Leo69
    Leo69
    Participant

    @Curt : Any follow-up on the laser engraving of dowels? Pics? I’ve found the hardware set-up to be simple but am working through debugging and modifying some open source gcode wrapping software to work with MPCNC and this will take a little time. Just wanted to see what you’ve worked on so we don’t duplicate efforts. I should have more free time to work on this so let me know what toolchain you’re using when you get a chance.

    #19341
    Profile photo of Curt
    Curt
    Participant

    The setup we have is for a specific diameter of dowel but with a little time it could be turned into a roller setup. I simply unplugged my X axis and plugged in the stepper rotating the dowel normal Gcode will move left and right burning the image and when the CNC thinks it is going up (plus X) it rotated the dowel and burns the next line. We determined that the dowel my buddy needed was almost the exact diameter as the gear used to drive the belts so we did not make any scaling changes. THe image is slightly compressed but on the dowel it is not noticeable.
    I will get it out in the next few days and get you some photos.

    #19418
    Profile photo of Curt
    Curt
    Participant

    Simple but works like a dream. It would be easy to add a second dowel/rod to make a roller for larger items. Sometime when I have the free time I will work on it.
    Simple dowel holder

    #19466
    Profile photo of Leo69
    Leo69
    Participant

    Looks similar to some designs I’ve seen on Thingiverse. Cool. How bad is the stretching/compressing of the image due to the straight tool path?

    #19486
    Profile photo of Curt
    Curt
    Participant

    I will print a a test box or something later on a flat surface and on the rod to measure but it was not off by much. The dowel he needed is almost the same size as the drive gear so when he did the math he laughed and said close enough.

    #19488
    Profile photo of Leo69
    Leo69
    Participant

    No worries, don’t want you wasting material to draw a box. I understand the concept, the wrapping of the toolpath is done by carefully selected gearing so no software needed. A change in stock diameter would just need a gear swap then right?

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