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  1. #21
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    Default Re: 1st DIY Router

    Ynnek - I found that thread about helical rack and pinion info. I posted a reply in my thread but it'll probably be more useful to you in your own thread

    http://www.cnczone.com/forums/genera...ck-pinion.html



  2. #22
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    Default Re: 1st DIY Router

    Quote Originally Posted by 1Jumper10 View Post
    Ynnek - I found that thread about helical rack and pinion info. I posted a reply in my thread but it'll probably be more useful to you in your own thread

    http://www.cnczone.com/forums/genera...ck-pinion.html
    Thanks for the headsup.



  3. #23
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    Default Re: 1st DIY Router

    So I am re-thinking some design. Steel being cheaper than aluminum, I am considering either 3/4 or 1 inch steel side plates instead of 6061 aluminum, along with using a rectangle steel tube, 3" x 6" which would be $100 - $120 less than extrusion. Downside would be costs of extra machining. I will probably build the Z axis all steel also, much cheaper than aluminum.

    the all steel gantry with everything attached would be around the 200 mark

    Two of the motors I have are 580oz/in & ftwo are 690oz/in, I would have a 3.2 belt reduction.
    .

    Last edited by ynnek; 06-27-2017 at 08:07 AM.


  4. #24
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    Default Re: 1st DIY Router

    Along the lines of my previous post, I have to determine if my motors would be up to the task on such a heavy gantry, if not, then my costs would then increase, then the savings from the materials change would be non existent.



  5. #25
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    Default Re: 1st DIY Router

    Back to semi-original plans. I can get the 8020 beam cheaper than EBAY, with no shipping charges either, local pickup, as my brother lives near where they do their shipping in Indiana. I will be heading that way some time this summer. I still may go with building the Y uprights & bearing trucks along with the complete Z axis, from steel.Not as heavy duty as all seell, but I feel it is a good compromise.



  6. #26
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    Default Re: 1st DIY Router

    You might want to consider designing your Y uprights using 8020 if you're going there anyway. The extra cost would be negligible I would think especially if you're going to pick up locally. And their cuts are precise enough that you would get two, equal length uprights which would make leveling/squaring your gantry easy.



  7. #27
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    Default Re: 1st DIY Router

    Quote Originally Posted by 1Jumper10 View Post
    You might want to consider designing your Y uprights using 8020 if you're going there anyway. The extra cost would be negligible I would think especially if you're going to pick up locally. And their cuts are precise enough that you would get two, equal length uprights which would make leveling/squaring your gantry easy.
    Only the gantry beam, X, will be extrusion. The Y uprights will be either 3/4 or 1" steel. Cheaper than aluminum & I can get them CNC machined where I work.

    The design can be viewed here, A360



  8. #28
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    Default Re: 1st DIY Router

    Question here, looking for advice. Within my design, I am using SBR25 supported round rail for bot X & y and SBR20 supported round rail on my Z, as I got it free. I do not have enough rail for both X & Y. I will have to buy some. I was thinking of buying some 20mm profile rail from Automation Overstock. There will not be that much costs difference between that purchasing SBR25 with bearings on EBAY coming from China. Any downside to using two different types of linear guides in a build or, should the be kept uniform? At the end of the day it just has to function properly.



  9. #29
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    Default Re: 1st DIY Router

    I don't see any downside.

    Sent from my Pixel XL using Tapatalk



  10. #30
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    Default Re: 1st DIY Router

    After looking at the overall costs, I will go with the profile rails on the Y axis. Down the road I can upgrade the rest of the machine to the same. Get the machine up and running, get some paying jobs & let it pay for the upgrade itself. Any good or bad reviews of the BLH linear guides at Automation Overstock?



  11. #31
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    Default Re: 1st DIY Router

    None that I'm aware of. If it helps, I bought all my linear bearings and pinion rack from from Kent at Automation overstock. He was very helpful and I would buy there again.

    Sent from my Pixel XL using Tapatalk



  12. #32
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    Default Re: 1st DIY Router

    Quote Originally Posted by 1Jumper10 View Post
    None that I'm aware of. If it helps, I bought all my linear bearings and pinion rack from from Kent at Automation overstock. He was very helpful and I would buy there again.

    Sent from my Pixel XL using Tapatalk
    Thanks for the input Jumper. THough I have a thread going, I have not actually started the build, short of acquiring stuff. Working 65 hours a week does not leave a lot of free time. I will though get started on laying out the electrical, wiring & bench testing. I have a cheap BOB to use in the interim. I have a CNC4PC C32 bob I need to get checked out. If that is not a viable option I will probably go with the UC300ETH & the MB2 I am currently laying out the changes to the linear rail, in Fusion360. Also, I intended to buy helical R&P, i will use the straight R&P I currently have. Also designing a dual pinion R&P drive to help compensate for backlash. I will either settle on building these or buying from CNCRP.

    Here is my dual pinion design attached to my X axis truck.
    A360



  13. #33
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    Default Re: 1st DIY Router

    How big are those pinions?
    What most people use, is a 3:1 reduction, with a 1" pinion, which gives about 1" of travel per revolution of the stepper.

    If that is not a viable option I will probably go with the UC300ETH & the MB2
    CNC Room will soon be selling the UB1 board, made specifically for the UC300ETH.
    UB1 Breakout Board [UB1] - $180.00 : CNCRoom, The Room for CNC'ers, from Mini to Big machine, from Hobbyists to Gurus - ????????????????? ???????????????????????????????

    Gerry

    UCCNC 2017 Screenset
    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

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

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


  14. #34
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    Default Re: 1st DIY Router

    I like your dual pinion design. Are they tensioned against each other or just driven by the single belt? FWIW, I never found backlash to be a problem even on my first machine which was pretty unrefined. And I only had a single rack and pinion drive. I can't remember if I ever measured it but if I did it must have been unremarkable. Anyway, a dual rack and pinion drive like yours is a better design in several respects and is pretty rare on a DIY machine.

    Sent from my Pixel XL using Tapatalk



  15. #35
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    Default Re: 1st DIY Router

    Quote Originally Posted by ger21 View Post
    How big are those pinions?
    What most people use, is a 3:1 reduction, with a 1" pinion, which gives about 1" of travel per revolution of the stepper.



    CNC Room will soon be selling the UB1 board, made specifically for the UC300ETH.
    UB1 Breakout Board [UB1] - $180.00 : CNCRoom, The Room for CNC'ers, from Mini to Big machine, from Hobbyists to Gurus - ????????????????? ???????????????????????????????
    They are what I happen to have in my possession. 20 pitch 40 teeth, about 2 inch. Plus these accommodate the keyless bushings I prefer to use. Thanks for the info on the UB1 Ger



  16. #36
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    Default Re: 1st DIY Router

    Quote Originally Posted by 1Jumper10 View Post
    I like your dual pinion design. Are they tensioned against each other or just driven by the single belt? FWIW, I never found backlash to be a problem even on my first machine which was pretty unrefined. And I only had a single rack and pinion drive. I can't remember if I ever measured it but if I did it must have been unremarkable. Anyway, a dual rack and pinion drive like yours is a better design in several respects and is pretty rare on a DIY machine.

    Sent from my Pixel XL using Tapatalk
    Single belt, wrapped around idlers to tension them against one another. Here is a screenshot
    A360

    Attached Thumbnails Attached Thumbnails 1st DIY Router-dual-pinion-drive-belt-jpg  
    Last edited by ynnek; 08-06-2017 at 07:44 PM.


  17. #37
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    Default Re: 1st DIY Router

    Well, I will purchase my steel tomorrow & possibly the linear rail I need also. Things are moving forward, albeit slow.



  18. #38
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    Default Re: 1st DIY Router

    Wondered if you ever found out any more about the BLH stuff from Automation Overstock? Thinking of my own 1st build and it sure looks interesting...



  19. #39
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    Default Re: 1st DIY Router

    Well. After putting things off because of work and a possible out of state move, I am back on my project. With a slight change though, I never did order the steel, as home projects took priority. Plus I have spent the majority of my time on the road this year, travelling for work. While at my local plant the other day, I stumbled upon an old machine frame that has been tagged to be cut up & sold for scrap. There is a good chance I will get it. It is a bit overkill, but would be free. Built from 5" square, 1/4" wall steel tubing. The dimensions are as follows, 62" x 82" x 24" tall. Plenty big for a 4 x 4 machine. With the savings from not buying materials to build a frame with, I will probably purchase some 25mm profile rail from Automation Overstock, along with the helical R&P. Should be a much better machine. Included is a photo of the frame I described.

    Attached Thumbnails Attached Thumbnails 1st DIY Router-img_20180818_073922505-1-jpg  


  20. #40
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    Default Re: 1st DIY Router

    Question if anyone wants to chine in. The frame is 82 x 62. Plenty for 48" of travel on both x (gantry) & y. Advantages & disadvantages of making the gantry (x) on the long side of the rectangle?



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