Thread: Cheap N Easy

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  1. #21
    Quote Originally Posted by Clive S View Post
    If you are serious at this you could design in Fusion360 it is free for hobby use, a big learning curve but it has CAM built in so you could use for generating the gcode later on.

    There are plenty of tutorials on it. like https://www.youtube.com/playlist?lis...Alt9yzBIp84sD8
    Click image for larger version. 

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    Something like this

  2. #22
    Is there a particular reason you've chosen chain and not toothed belt?

    - Nick
    You think that's too expensive? You're not a Model Engineer are you? :D

  3. #23
    Quote Originally Posted by magicniner View Post
    Is there a particular reason you've chosen chain and not toothed belt?

    - Nick
    It's just what I had laying about. To be honest may end up using timing belt. If I have too many issues getting cogs for the chain.

    Didn't like the price of the correct screws and had problems finding in the final size I want.

    As for the belts I could find plenty but already had plenty of chain. I'll have to gear down the ratio between the stepper and the x axis cog control arm. Which as far as I can tell will be easy enough and provide even more torque.

  4. #24
    Yep I'm still here. Just been debating and waiting on parts.
    so i've been dicking about with my moch up as i learn better in the physical.

    So then i had my Y Axis working. I used a toothed belt after someone asking why not.
    Now i know why not. Me! I'm soooo lazy. A chain can be a length or a loop real easy. Belt not so much.

    Then I worked on my X axis movement.
    Had to get creative as no coupling have turned up so far! Annoyed YES!

    But i had hit the weight limit for the cheapy motors i had. :(
    No drama

    All is not lost.

  5. #25
    Quote Originally Posted by CNCKitMan View Post
    But i had hit the weight limit for the cheapy motors i had. :(
    No drama

    All is not lost.
    Don't forget you'll need plenty of power spare for the cutting forces, not just moving the axis about...



    Sent from my HUAWEI VNS-L31 using Tapatalk
    Neil...

    Build log...here

  6. #26
    Quote Originally Posted by njhussey View Post
    Don't forget you'll need plenty of power spare for the cutting forces, not just moving the axis about...



    Sent from my HUAWEI VNS-L31 using Tapatalk
    Yes brother. I spotted that. Turns out my gantry is a little heavy with the rails I aquire.

    Put a shirt tty Lil dremel style tool on it as a "let's see" . Getting a first eye on the forces and how/what they do and where.

    What do you think of the flat rails and the supported bar rails which being best.

  7. The Following User Says Thank You to CNCKitMan For This Useful Post:


  8. #27
    OK so where am I.
    After the weight limit issue. Rather than buy more powerful motors I scaled down.

    Now have a rag tag machine with all 3 working axis.
    No spindle as of yet, not even my test tool.

    Videos and photos to come soon.
    Brace yourselves as she's proper ugly.

  9. #28
    Quote Originally Posted by CNCKitMan View Post
    A chain can be a length or a loop real easy. Belt not so much.
    A belt can be used as a cut length as easily as chain, if you need a continuous loop then you will need to use an off the shelf size which can mean you need to make your mounts to allow adjustment of pulley spacing, but smooth drive, lower energy losses, and reduced wear and maintenance really can make the effort worthwhile,
    Regards,
    Nick
    You think that's too expensive? You're not a Model Engineer are you? :D

  10. #29
    Yeah I hear the looped belt i know you can by them presized. That's my issue right there as i would have need to buy several due to how i don't plan most things. Hey it's how i work!

    The chain however i can shorten, lengthen, loop or otherwise with ease. the CON being finding sprockets for the Stepper.

  11. #30
    OK so over the weekend, I had my mate (kids in tow) come round and we tinkered with the CNC mockups.
    After which i had one quick upgrade and now i have an almost fit for purpose machine.

    I still want to replace 80% of the parts (as i'm a bad carpenter)
    Photos and Video to follow.

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