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Thread: $600 all in cost - 2x2 first CNC

  1. #21
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    Default Re: $600 all in cost - 2x2 first CNC

    I have used the single axis TB6560 drives that you have and have not had any big problems ever. Most of the problems you hear about are the all-in-one boards that have 3 or 4 zxis drives built in and a integrated BOB as well. I think the drives you have will get you going.

    Having said the above, the single axis TB6600 drives are better. I have some of those too and the cost isn't any higher than the TB6600. So, if you do blow one of the TB6560's then I would replace with a TB6600. The ones I have look a lot like the TB6560's you have with an exposed circuit board. I think the last 3 I bought cost $18 for 3 of them. They work well and theyseem smooth. They do have a couple problems as bought and won't produce the full 4 amps, but if you don't need it they work great. It is also fairly easy to fix them if you need to. Here is a link to the ones I have and a little bit about them.

    http://www.cnczone.com/forums/steppe...ml#post1979892



  2. #22
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    Default Re: $600 all in cost - 2x2 first CNC

    Thanks for the info John. I do wish I had bought the TB6600 instead. Another poster, said the same thing.

    BTW, it was your post in the G0704 thread that got me convinced and excited about using GRBL/Arduino with cheap steppers. I most likely wouldn't have started this build without this info. Thanks for sharing your experience on the forums.



  3. #23
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    Default rails completed

    • 2" slats routed and cut to length
    • holes drilled in aluminum angle and recessed
    • attached angle to slats completing the rails


    Attached Thumbnails Attached Thumbnails 0 all in cost -  2x2 first CNC-20170311_093906-jpg   0 all in cost -  2x2 first CNC-20170311_093917-jpg   0 all in cost -  2x2 first CNC-20170311_100032-jpg   0 all in cost -  2x2 first CNC-20170311_125149-jpg  

    0 all in cost -  2x2 first CNC-20170311_125155-jpg  


  4. #24
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    Default Re: rails completed

    Any issues with the bearing hitting the screws holding the rail? I had to countersink mine a little.



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    Default Re: rails completed

    I did counter sink the holes in the angle and still had issues with the bearing washers hitting the screw head because some of the screws were not centered on the angle edge. I fixed it by simply grinding down the screw heads that causing the issue.



  6. #26
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    Default linear bearings completed

    • bearings assembled on to aluminum angle
    • slots cut on bearing carrier
    • aluminum angle attached to bearing carrier


    I tried to get the wife to help assemble the bearings. she was not interested...

    Attached Thumbnails Attached Thumbnails 0 all in cost -  2x2 first CNC-20170312_094907-jpg   0 all in cost -  2x2 first CNC-20170312_100149-jpg   0 all in cost -  2x2 first CNC-20170312_101259-jpg   0 all in cost -  2x2 first CNC-20170312_101308-jpg  



  7. #27
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    Default gantry progress

    • gantry box assembled - glued, clamped, nailed and screwed
    • rail spacer glued and screwed


    Attached Thumbnails Attached Thumbnails 0 all in cost -  2x2 first CNC-20170312_140535-jpg   0 all in cost -  2x2 first CNC-20170312_140552-jpg   0 all in cost -  2x2 first CNC-20170312_141513-jpg  


  8. #28
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    Default leadscrew purchase - ballscrews

    I'm thinking of purchasing the following 16mm ballscrews. Any thoughts on this ?

    SFU1605 1000mm for the X and Y -$39 each
    SFU1605 250mm for the Z - $20



  9. #29
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    Default Re: $600 all in cost - 2x2 first CNC

    With the PS you have I'd choose a 10mm pitch for X & Y.



  10. #30
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    Default Re: $600 all in cost - 2x2 first CNC

    faster would be better but the 10mm screws are at least $90 each. The total leadscrew cost goes from $100 to $200... at this point it's not worth it to me. Where did you source your leadscews from ?

    Last edited by junior2016; 03-13-2017 at 01:18 PM.


  11. #31
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    Default Re: $600 all in cost - 2x2 first CNC

    BST Automation on Aliexpress.

    90$ shipped per 1000mm and 75$ per 700mm if my memory serves me correctly.

    But at that price I had the coupler, the nut housing, the bearing blocks, but most important not bent. The machining was really good and their customer service is by far the best I've seen on Ali.

    Contact the seller directly shipping is usually cheaper and faster when you group items on one order. It was for me.



  12. #32
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    Default attach rails to base

    • drill recess on the back side of the base
    • hammer in T-nuts
    • glue in rail supports
    • bolt on rail


    Attached Thumbnails Attached Thumbnails 0 all in cost -  2x2 first CNC-20170314_064707-jpg   0 all in cost -  2x2 first CNC-20170314_070012-jpg   0 all in cost -  2x2 first CNC-20170314_070407-jpg  


  13. #33
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    Default table is sliding!

    I was finally able to get the sliding table working but it was more difficult than I expected. I have 2 main issues:
    1) the end 5/16 nut on bearing assembly was brushing up against the table base
    2) one of the 608 bearings was not toughing the rails on each of the bearing assemblies

    To address issue 1, I added a ¼ plywood strip between the rail spacer and the rail blocks. This gave just enough clearance and allowed the bearings to move freely. I'm excepting to have the same issue on the Y and Z axises. Issue 2 was more complicated to resolve. First I enlarged the hole in the aluminum angle but this still was not enough. The hex head of the bolt was not allowing me to push the bolt towards the angle’s vertex. I had to cut the hex head a bit and then was able to push the bolt far enough towards the vertex to remove slop.



  14. #34
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    Default Y Carriage

    Y Carriage assembled and is now sliding. It's not perfect as there's still some binding but it slides. Aligning and adjusting is not easy. It takes 5 times the effort to get the slides working then to cut, drill and assemble the actual machine.. very frustrating. Here are a few pics of the progress so far.

    Attached Thumbnails Attached Thumbnails 0 all in cost -  2x2 first CNC-20170321_183819-jpg   0 all in cost -  2x2 first CNC-20170321_183825-jpg   0 all in cost -  2x2 first CNC-20170321_183840-jpg   0 all in cost -  2x2 first CNC-20170321_183849-jpg  

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  15. #35
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    Default Re: Y Carriage

    It sounds like you are having a lot more trouble than I had when I built my 2 prototypes. A couple of things to note.

    1) The location of the bearings on the aluminum angles need to be as consistent in their placement as possible. I stacked 2 - 1/8" flat bars pieces of aluminum on the inside of the aluminum angle and ran a scribe down the length to keep the height of the bearings constant, I used a center punch in the groove left by the scribe to place a divot to guide the drill bit to make the pilot hole and then stepped it up to the correct size.

    2) I cut spacers on the table saw to space the bearing apart, this is critical as they need to be parallel to get all the bearings to make contact at the same time.

    These 2 steps are probably the most important steps in getting the bearings working well.

    3) I also used spacers to position the first (non-adjustable rail) parallel to edge of the base and then additional spacers to space the 2 rails apart. Using spacers (and clamps) allows you to make sure all the pieces are square to the sides of the machine and parallel to each other.

    4) For the other 2 rails, you just need to to align the first/top (non-adjustable rail) to the edge of the spacer block and use a spacer between the rails.

    2) I had issues with the bottom nut of the bearing rubbing before I adjusted the rail spacing using the bolts between the rails... So I looked at the plans and noticed that these bolts/nuts are not present on most of the drawings (sigh)... If you look at the MTBA (Moving Table - Base) or BFGA (Flying Gantry Base) pages you can see the RTS36 (36 Inch Rail Tensioner Spacer) and RT36 (36 Inch Rail Tensioner) parts. The same idea applies to the other rails, except the bolts/nuts are in the non-adjustable rail.

    0 all in cost -  2x2 first CNC-tensionerbolts-jpg

    Other options to address the rubbing are to make sure the bolt is such that the flat is facing down or use a thinner nut (less wide). This really wasn't much of an issue for me, but I will check it out again.

    When I get a chance I will update the plans, in the middle of a job search right now, so it is hard to make time for the fun stuff. I am suppose to be building a machine with a friend in a few weeks with idea that we will take good photos and video of all the steps and write up some decent instructions, I will probably do the updates then.

    Sorry you are having issues, you are sort of the guinea pig as I am sure my mind just fills in the blanks when I was proofing the plan to see if I missed anything.

    Please let me know what other issues you encounter and I will try to help work thru them.

    Last edited by grumpygeek; 03-23-2017 at 12:06 AM.


  16. #36
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    Default Re: Y Carriage

    I also noticed you have washers on the 608 bearings? That would also account for the nut rubbing... the 1/4 spacers you made will adjust for that.



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    Default Re: Y Carriage

    Thanks for the tips.. I will keep playing with the adjustments to make the slide a bit better. Now it's time for the Z-axis. At the end of the day this is a hobby and I am enjoying the build. I will be really happy once I get it up and running. I can always go back and make impovements on things that are not as perfect as they should be. Good luck on the job hunt!



  18. #38
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    Default z Carriage

    I was able to attached the Z carriage rails and bearings without issue. They run pretty smoothly.

    Attached Thumbnails Attached Thumbnails 0 all in cost -  2x2 first CNC-20170325_153124-jpg   0 all in cost -  2x2 first CNC-20170325_153132-jpg   0 all in cost -  2x2 first CNC-20170325_153100-jpg  


  19. #39
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    Default Re: linear bearings completed

    Quote Originally Posted by junior2016 View Post
    • bearings assembled on to aluminum angle
    • slots cut on bearing carrier
    • aluminum angle attached to bearing carrier


    I tried to get the wife to help assemble the bearings. she was not interested...
    That is either reason for divorce or something to be thankful for.



  20. #40
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    Default Re: linear bearings completed

    Quote Originally Posted by wizard View Post
    That is either reason for divorce or something to be thankful for.
    She's not very useful with the hobby, but she is nice to look at. We'll keep her. Glad to see at least someone is reading the thread with a sense of humor.



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