CnC Build





Page 1 of 2 1 2 LastLast
Results 1 to 20 of 22

Thread: CnC Build

  1. #1
    Join Date
    Sep 2009
    Location
    [REMOVED]
    Posts
    2,186
    Thanked: 262

    Default CnC Build

    For a long time now I wanted to build a CNC. A while back I started building a CNC but failed and ended up building a 3D printer instead. So now I'm back at it.

    Some goals.
    1. Use components that are very easy to come by.
    2. It has to be scalable.
    3. Must be as cost effective as possible but accuracy and reliability must be acceptable.
    4. Must be low profile.
    5. Must be able to mill wood or Alumenium. (Thought still in progress).

    In the end if it turned out successful I promise to make all of the designs/drawings or what ever else was generated in order to build this available for free. I hope someone is willing to contribute with ideas.

    If you are are familiar machines in the world of open source CNC then the above will scream Shapeoko and XCarve to you.

    Shapeoko
    Click image for larger version. 

Name:	xxlbanner.jpg 
Views:	63 
Size:	109.9 KB 
ID:	570497

    Xcarve
    Click image for larger version. 

Name:	xcarve_45angle-5ae5e290cfce25d7bf5c67d846e8540b2d927a23afa0489447521aa816480af6.jpg 
Views:	65 
Size:	93.3 KB 
ID:	570498



    Besides the cost, The problem with these are the components are hard to come by. I.E the Makerslide extrusion which started off as kick starter project is damn near impossible to get locally. And when you do find a supplier there's almost never stock. And you never know if they are legitimate.

    I'm very sure many other people tried what I'm trying to accomplish here but I'm willing to give it a go.

    Maker slide example.
    Click image for larger version. 

Name:	makerslide-extrusion.jpg 
Views:	65 
Size:	16.4 KB 
ID:	570485Click image for larger version. 

Name:	Untitled.png 
Views:	59 
Size:	204.1 KB 
ID:	570486

    Note the triangular lips on the top and bottom, You are supposed to run a derlin wheel on as shown in the second photo. There is another option that allows you to bolt a strip that has the lip onto the extrusion. So possibly you can take 3mm alu flat bar (Available from builders chamberlain) and rip it on a table saw at a 45 degree angle. I unfortunatly do not have the equipment for that,.

    Other option is to make use of v-slot profiles.
    Click image for larger version. 

Name:	unnamed.jpg 
Views:	61 
Size:	24.1 KB 
ID:	570488
    The V-slot appeals more to me and is easier to find but most of the time the places where I buy from don't have stock. Sometimes months go by then only do they get stock (Not referring to the current virus situation) They also need Derlin wheels which cost R50 a pop. R1000 easily for the bearings only if you can find them off coarse.

    So before going the Vslot route I would like to explore other avenues. And your input here is very welcome.

    I made the below but I'm not happy with it. It needs both sides to be on a rail otherwise it will derail. I also don't know how well the alumenium angle iron will hold up if you run a bearing directly on it , I think most bearings are made from Chrome Steel. If you ever tried to cut a linear rod made from chrome coated steel with a hack saw you will know what i mean. I'm still willing to try run a bearing on it though.

    Click image for larger version. 

Name:	yax.png 
Views:	64 
Size:	150.4 KB 
ID:	570490Click image for larger version. 

Name:	yax2.png 
Views:	66 
Size:	1.53 MB 
ID:	570491
    Last edited by SBSP; 2020/05/06 at 09:08 PM.

  2. The Following User Says Thank You to SBSP For This Useful Post:


  3. #2
    Join Date
    Jan 2012
    Location
    durban
    Age
    56
    Posts
    1,457
    Thanked: 1119

    Default Re: CnC Build

    Would using linear bearings not be cheaper and easier to get.

  4. #3
    Join Date
    Sep 2009
    Location
    [REMOVED]
    Posts
    2,186
    Thanked: 262

    Default Re: CnC Build

    Quote Originally Posted by plunger View Post
    Would using linear bearings not be cheaper and easier to get.
    Do you mean the below that run on a round bar ?
    The below is an example of an 8UU which runs on a 8MM round chrome rod. Problem with them is they cannot run on very long rail without causing droop in the rail.
    Vertically they are fine but horizontally they also tend to fail easily. You do get half bearings which will run on a rod which you can mount on a flat surface.
    That may also be a good idea.

    I should have mentioned that the one I want to build must be 500mmx500mm. But would like it designed in such a way that you can just exchange it for say 1000mm x 500mm

    Click image for larger version. 

Name:	07f47cbb-75de-442f-a67c-4632f181f6e7.jpg 
Views:	50 
Size:	21.3 KB 
ID:	570504

  5. #4
    Join Date
    Oct 2007
    Location
    Somerset West
    Age
    63
    Posts
    81
    Thanked: 15

    Default Re: CnC Build

    I am also building a CNC router. I want to do it as cheap as possible by using as much of my scrap material that I have collected over some time. I have converted a milling machine to cnc before and now are using the x and y lead-screws that I have replaced on the machine with ball-screws. For the router's x-axis I need to buy a new lead-screw and I am going to use two 1 m heavy duty slides that I bought some time ago to make a drawer system for my vehicle. They are very heavy and I hope they will work. The z-axis also make use of slides. I made the contraption some time ago to make a drill press for my Dremel tool. See pictures.

    I plan to use three NEMA 23 motors to drive the machine with Mach 3. I would appreciate it if you have suggestions were to buy these plus the rest of the required electronics for a decent price.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	IMG_20200506_170116.jpg 
Views:	72 
Size:	159.6 KB 
ID:	570560   Click image for larger version. 

Name:	IMG_20200506_170130.jpg 
Views:	72 
Size:	170.7 KB 
ID:	570561   Click image for larger version. 

Name:	IMG_20200501_100602.jpg 
Views:	67 
Size:	169.2 KB 
ID:	570562   Click image for larger version. 

Name:	IMG_20200501_112122.jpg 
Views:	66 
Size:	195.9 KB 
ID:	570563   Click image for larger version. 

Name:	IMG_20200501_112149.jpg 
Views:	68 
Size:	186.3 KB 
ID:	570564   Click image for larger version. 

Name:	IMG_20200506_161049.jpg 
Views:	71 
Size:	233.8 KB 
ID:	570565  

  6. The Following User Says Thank You to ockert For This Useful Post:


  7. #5
    Join Date
    Dec 2014
    Location
    Cape Town
    Age
    54
    Posts
    3,053
    Thanked: 1918

    Default Re: CnC Build

    Look at Rexroth extrusions for your build, they are pretty strong.
    https://www.boschrexroth.com/en/us/p...-framing/index
    Cheers,
    John

    Rover P6
    Land Rover Discovery II Td5 Manual
    Range Rover P38 HSE
    Moto Guzzi LeMans
    Aprilia Tuono V2

  8. #6
    Join Date
    Oct 2010
    Location
    Pretoria
    Age
    61
    Posts
    1,569
    Thanked: 522

    Default Re: CnC Build

    Enjoy, I designed and built a 3000 x 2000 x 300 router.

    Its a very rewarding project.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	20200507_122305_copy_1008x477.jpg 
Views:	106 
Size:	119.8 KB 
ID:	570570   Click image for larger version. 

Name:	20200506_134613.jpg 
Views:	88 
Size:	203.3 KB 
ID:	570571  

  9. The Following User Says Thank You to faniedup For This Useful Post:


  10. #7
    Join Date
    Oct 2007
    Location
    Somerset West
    Age
    63
    Posts
    81
    Thanked: 15

    Default Re: CnC Build

    That's a monster. Very nice!

  11. #8
    Join Date
    Sep 2009
    Location
    [REMOVED]
    Posts
    2,186
    Thanked: 262

    Default Re: CnC Build

    Very Nice!

    Where did you get those thick alu plates ?

  12. #9
    Join Date
    Oct 2010
    Location
    Pretoria
    Age
    61
    Posts
    1,569
    Thanked: 522

    Default Re: CnC Build

    Quote Originally Posted by SBSP View Post
    Very Nice!

    Where did you get those thick alu plates ?
    You mean the uprights for the Y-axis? That is moulded carbon fibre parts.

  13. #10
    Join Date
    Jan 2012
    Location
    durban
    Age
    56
    Posts
    1,457
    Thanked: 1119

    Default Re: CnC Build

    I guess all these cnc builds are really light duty for wood and may struggle with alu. As with any machine rigidity is key and theres no easy way around rigidity but to have lots of metal. And lots of metal is expensive. I wonder if its not better to use an existing machine.
    I am thinking mill so my comment is out of context.As the OP mentions he wants something with a low profile.
    I wouldnt mind building a cnc router if it could help me dip my toes into cnc.

    That big homebuilt router,what is used for the spindle.?

  14. #11
    Join Date
    Oct 2010
    Location
    Pretoria
    Age
    61
    Posts
    1,569
    Thanked: 522

    Default Re: CnC Build

    Quote Originally Posted by plunger View Post

    That big homebuilt router,what is used for the spindle.?
    Its a 1.5kW watercooled motor, vfd and 20000rpm.

    I cut 95% wood/mdf/plastic and the odd profile cuts out of 3mm aluminium sheet.

  15. #12
    Join Date
    Jan 2012
    Location
    durban
    Age
    56
    Posts
    1,457
    Thanked: 1119

    Default Re: CnC Build

    Quote Originally Posted by faniedup View Post
    Its a 1.5kW watercooled motor, vfd and 20000rpm.

    I cut 95% wood/mdf/plastic and the odd profile cuts out of 3mm aluminium sheet.
    What kind of chuck system does it use. Is it ER 16 or something like that?Is it three phase. ? What kind of quality does the spindle have on its bearings.?Is that one of the chinese spindles that people have been raving about. The spindle is pretty vital in terms of quality of cut from what Ive read.
    Can it cut alu composite like ibond etc.

  16. #13
    Join Date
    Oct 2010
    Location
    Pretoria
    Age
    61
    Posts
    1,569
    Thanked: 522

    Default Re: CnC Build

    Quote Originally Posted by plunger View Post
    What kind of chuck system does it use. Is it ER 16 or something like that?Is it three phase. ? What kind of quality does the spindle have on its bearings.?Is that one of the chinese spindles that people have been raving about. The spindle is pretty vital in terms of quality of cut from what Ive read.
    Can it cut alu composite like ibond etc.
    Yes it's Chinese with collets up to 10mm, look at Hobbytronics online website, I bought it from them, works well for my application. Yes it's 3 phase.

    It will cut Ibond no problem.
    Last edited by faniedup; 2020/05/07 at 07:08 PM.

  17. #14
    Join Date
    Sep 2009
    Location
    [REMOVED]
    Posts
    2,186
    Thanked: 262

    Default Re: CnC Build

    I gave up on the idea of using an alternative method for the rails.

    I purchased some 20x20 T-Slots , 20x40 V-Slots extrusions with some delrin wheels. For starters I will 3d print the side plates. Will most probably not provide rigidity. But once I have it right
    I will cut the shapes using 3d printed templates out of 3mm mild steel.


    Click image for larger version. 

Name:	frame.png 
Views:	57 
Size:	2.53 MB 
ID:	570737

  18. #15
    Join Date
    Jan 2012
    Location
    durban
    Age
    56
    Posts
    1,457
    Thanked: 1119

    Default Re: CnC Build

    How true are those alu extrusions.In terms of flatness and rigidity

  19. #16
    Join Date
    Sep 2009
    Location
    [REMOVED]
    Posts
    2,186
    Thanked: 262

    Default Re: CnC Build

    Quote Originally Posted by plunger View Post
    How true are those alu extrusions.In terms of flatness and rigidity
    I believe they are pretty accurate. By design they are very rigid Its all in the shape.

  20. #17
    Join Date
    Jan 2012
    Location
    durban
    Age
    56
    Posts
    1,457
    Thanked: 1119

    Default Re: CnC Build

    [QUOTE=SBSP;4386875]I believe they are pretty accurate. By design they are very rigid Its all in the shape.[/QUOTE

    Where and how much is it

  21. #18
    Join Date
    Sep 2009
    Location
    [REMOVED]
    Posts
    2,186
    Thanked: 262

    Default Re: CnC Build

    [QUOTE=plunger;4386877]
    Quote Originally Posted by SBSP View Post
    I believe they are pretty accurate. By design they are very rigid Its all in the shape.[/QUOTE

    Where and how much is it

    I usually by from the 3d printing store. Close to work

    20x20 T-Slot R237.00 for 3 metre
    http://www.3dprintingstore.co.za/alu...-slot-profile/

    R477.00 for the 20x40 V-Slot
    http://www.3dprintingstore.co.za/alu...-slot-profile/

    If you want to try someone in your valey
    https://www.diyelectronics.co.za/sto...inium-profiles
    I have bought stuff from them in the past

  22. #19
    Join Date
    Jan 2012
    Location
    durban
    Age
    56
    Posts
    1,457
    Thanked: 1119

    Default Re: CnC Build

    I soppose flat is relative.If you take a lathe and over a meter if it was out by 0,4mm over one meter it would be horribly unacceptable.If it was 0,04mm it would still be bad but usable. I cant see an extrusion being accurate over a meter and being better than cast iron.But if its in wood it may have no bearing on the end product if it has a 0,1mm variation in it.

  23. #20
    Join Date
    Oct 2010
    Location
    Pretoria
    Age
    61
    Posts
    1,569
    Thanked: 522

    Default Re: CnC Build

    Quote Originally Posted by plunger View Post
    I soppose flat is relative.If you take a lathe and over a meter if it was out by 0,4mm over one meter it would be horribly unacceptable.If it was 0,04mm it would still be bad but usable. I cant see an extrusion being accurate over a meter and being better than cast iron.But if its in wood it may have no bearing on the end product if it has a 0,1mm variation in it.
    It all depends on what you want to do with it. A lot of routers only do profile cutting, for which the flatness is not the end of the world.

    I do a lot of 3d wood machining, for which 0,4mm is also not the end of the world given that you still need to sand the toolpaths out of your product anyway.

    What I have done is to stick a fly cutter into the spindle and face the spoil board after the build to compensate in part.

Page 1 of 2 1 2 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •