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  1. #13
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    I think Dremel tools are great, however, they were never designed for this level of duty and the power you could apply to the handpiece would be very limited.

    The Dremel could meet your needs if your needs do not exceed the capability of the Dremel.

    Define the tasks to be acomplished, then find a spindle for your needs.

    Mike



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    That's why I was thinking of hacking a handpiece, I will only cut, engrave plastic, I hate the noise a dremel makes

    Marc..



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    OK I guess that there are'nt any off the shelf spindles that are cheap. Are any of us game to provide a spindle that can be used with a step pulley that can achive at least 32k rpm's.? What dia. steps are neeed, what rpm motor, can it be activated by Mach2? I have a million ides but not all the knowledge to even attempt such a thing so I guess I'll just be an observer for a while longer.



  4. #16
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    Speedre,

    http://www.buildyouridea.com/cnc/pcb...pcb_drill.html
    http://www.buildyouridea.com/cnc/pcbmill/spindle.html
    http://www.kleinbauer.com/

    Take a look at these websites for a high speed, homebrew, low cost spindle and MILL for PCB/Plastics work. I would also check ebay for PCB spindles.
    I ordered a PCB spindle and instant Z axis from "CNC On a Budget" over a year ago and never received them. I can't recommend that company.
    A 5 amp .8 Hp two speed rotary tool that turns 20K and 30K RPM with 1/4" and 1/8" collets is available at Sears for about $80.00 on sale with attachments. They are about double the size of a Dremel and half the size of a router. I use one in my mini gantry mill for PCB and wood working. There are pics in the gallery.

    Mike

    Last edited by MikeAber; 06-24-2005 at 03:11 AM. Reason: Latest info on the Craftsman All-in-one rotary tool


  5. #17
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    So if the pictures and information on the builyouridea site are acurate the putting together a spindle isn't rocket science. I guess I could just make my own, right?



  6. #18
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    Why not give it a try?
    There are at least a half dozen websites with info on home made spindles or spindles on the cheap do it yourself side of things. I am certainly no expert in this area, however, I know lots more now than I did a couple of years ago.
    Investigate what kind of bearings are needed for 30,000+ RPM and how much horsepower you will need to get the job done, even if it is by the imperical method. Many others before you have started with no experience and learned by failure and success what works and what does not.

    Check out the CNC Mill at this website for lots of inspiration and spindle ideas. http://www.5bears.com/

    You will gain a wealth of knowledge and experience for your efforts that is worth more than money.

    Mike



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    I'm using a dremel and it don't work well for cutting metal. The bearings are mounted in foam rubber, so even a light side force will cause the tip to move by 15 mil or more. This can cause it to climb into the work and possibly break the bit.

    Need to think of a way to replace the foam without causing the bearings to bind.



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    I'm a bit confused by an earlier post. If I used my mini-mill motor and spindle for my gantry machine, why would'nt it be fast enough? I should think if it's fast enough for the mini-mill in the first place why then is it not fast enough for my gantry? I have cut both plastic and aluminum with my mini-mill and never had a problem, so again why not fast? I need to know if I can use the motor with a step pulley to achive usable speeds. How do I calculate pulley diameters?



  9. #21
    Community Moderator ger21's Avatar
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    Quote Originally Posted by SPEEDRE
    I'm a bit confused by an earlier post. If I used my mini-mill motor and spindle for my gantry machine, why would'nt it be fast enough? I should think if it's fast enough for the mini-mill in the first place why then is it not fast enough for my gantry? I have cut both plastic and aluminum with my mini-mill and never had a problem, so again why not fast? I need to know if I can use the motor with a step pulley to achive usable speeds. How do I calculate pulley diameters?

    What do you want to cut? You said you want a 30,000 rpm spindle, but it was mentioned that the LMS spindle is only good for 5,000 rpm. If your cutting wood, you'll usually want between 10,000 to 20,000.

    What's wrong with a variable speed router? You'll most likely have to spend quite a bit more money to get comparable performance.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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    Yep going to use variable speed router. It's the best idea short of having a production model expensive item. I hope I did'nt cause any trouble. Dremel is not an option too much runout and Z slop. The next problem dust conrtol. See my posts on this subject. Over and out..



  11. #23
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    Here is an idea for a spindle I found on the Internet which might be of interest. http://www.rcmodels.net/cnc/hobby/size/home2.html

    HTj



  12. #24
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    Harbor Freight and Homier both carry a cheap pneumatic grinder, which appears very similar in structure to a belt driven spindle. I've had the idea, for a while, to buy one of them and retrofit it using the existing shaft/chuck, and hook up a pulley in place of the impeller. It'd definitely need new bearings, but that probably would be no harder than finding some metric bearings, since it's Chinese.

    I wonder if anyone has tried something like this?

    -- Chuck Knight



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