. .
Page 3 of 6 FirstFirst 12345 ... LastLast
  1. #21
    Nick's Avatar
    Lives in East Yorkshire, United Kingdom. Last Activity: 3 Weeks Ago Has been a member for 3-4 years. Has a total post count of 25. Received thanks 3 times, giving thanks to others 0 times.
    Some progress today, managed to cast the table.

    Click image for larger version. 

Name:	table-mold.jpg 
Views:	242 
Size:	89.3 KB 
ID:	26076Click image for larger version. 

Name:	20190721_174823.jpg 
Views:	237 
Size:	93.4 KB 
ID:	26077

  2. #22
    Chaz's Avatar
    Lives in Ickenham, West London, United Kingdom. Last Activity: 5 Days Ago Has been a member for 7-8 years. Has a total post count of 1,477. Received thanks 104 times, giving thanks to others 67 times.
    Good to see that you are still at it.

  3. #23
    Nick's Avatar
    Lives in East Yorkshire, United Kingdom. Last Activity: 3 Weeks Ago Has been a member for 3-4 years. Has a total post count of 25. Received thanks 3 times, giving thanks to others 0 times.
    Some progress:

    It started to look a bit like a mill:

    Click image for larger version. 

Name:	20190722_185516_rot3.jpg 
Views:	237 
Size:	192.1 KB 
ID:	26698

    Next step was to flatten the base casting so I could get the rails on. It was to big an area to scrape and the reference surface and base were to heavy to invert. So I blocked off two rail sized areas with wood and then used an angle grinder to lower the rest of the surface, a bit crude but worked well.

    Click image for larger version. 

Name:	20190803_134929_rot1.jpg 
Views:	167 
Size:	195.7 KB 
ID:	26694

    I then flipped my surface plate and lowered it onto the base. It wasn't that far off, you could see damage from the previous owners of the surface plate.

    Click image for larger version. 

Name:	20190810_185920_rot.jpg 
Views:	165 
Size:	277.7 KB 
ID:	26692Click image for larger version. 

Name:	20190803_152945_rot2.jpg 
Views:	156 
Size:	235.0 KB 
ID:	26695

    After several rounds of scraping, it is flat to about 0.02 - 0.03 mm

    Click image for larger version. 

Name:	20190803_191843.jpg 
Views:	150 
Size:	425.3 KB 
ID:	26697

    Y axis and saddle installed:

    Click image for larger version. 

Name:	20191004_154015_rot.jpg 
Views:	175 
Size:	409.7 KB 
ID:	26691

    Next step is to flatten the Z-axis rails, im using the same process as with the base, flipping the surface plate, it's really slow going.

    Click image for larger version. 

Name:	20191005_133903_rot.jpg 
Views:	127 
Size:	197.7 KB 
ID:	26693Click image for larger version. 

Name:	20191011_152019.jpg 
Views:	147 
Size:	367.6 KB 
ID:	26696

  4. #24
    Nick's Avatar
    Lives in East Yorkshire, United Kingdom. Last Activity: 3 Weeks Ago Has been a member for 3-4 years. Has a total post count of 25. Received thanks 3 times, giving thanks to others 0 times.
    More progress, rails installed, steppers installed on temp 3D printed mounts, temporary head and spindle.

    First axis movements (Y axis not working):

    https://www.youtube.com/watch?v=rAVX...ature=youtu.be

    Click image for larger version. 

Name:	mill-1.jpg 
Views:	223 
Size:	197.0 KB 
ID:	26993

    Next steps:

    Alignment, use mill to mill better mounts, mill permanent head BT30, servos, way covers.

    Does anyone have any experience with the cheap AC servo's on aliexpress? In particular the 60ST-M01930? Not found much on these.

    Has anyone bought way covers from aliexpress? I was thinking about getting some "Armoured bellow cover"?

    Nick

  5. #25
    Chaz's Avatar
    Lives in Ickenham, West London, United Kingdom. Last Activity: 5 Days Ago Has been a member for 7-8 years. Has a total post count of 1,477. Received thanks 104 times, giving thanks to others 67 times.
    Ive looked at the servos, Ill be getting some once we get this house buying marlarky done.

    Congrats, commented on your video.

  6. #26
    Quote Originally Posted by Nick View Post
    Does anyone have any experience with the cheap AC servo's on aliexpress? In particular the 60ST-M01930? Not found much on these.
    Where you located Nick.? Says E yorks.? Anywhere near Goole.

    I've got some 400W waiting to go on a machine which are exactly the same drives and motors just lower power. So if you want to have a play with them on the bench your welcome to come over. For the money, they can't be beaten.

    Edit: Actually just had thought.? They could actually be 600w I had set of 400w and 600w but fitted one set to a machine and I think they where the 400w. I'll Check when I get back to work on Monday.
    Last edited by JAZZCNC; 03-01-2020 at 11:02 PM.

  7. #27
    Nick's Avatar
    Lives in East Yorkshire, United Kingdom. Last Activity: 3 Weeks Ago Has been a member for 3-4 years. Has a total post count of 25. Received thanks 3 times, giving thanks to others 0 times.
    Chaz - First movements have been very rewarding, hoping the pace picks up now.

    I'm near Hull about an hour from Goole, that's a very kind offer, it might be a while till I could get over. That's reassuring that you've got them to work. I'm having a hard time making sense of the Chinese-English hybrid manual. I would be using them in the "position mode" initially, have you had any issues with overshoot? Are you using "open collector input mode" or using the suggested "AM26LS31 similar line drive"? Or 0-10v? I found the below video, which was bit concerning having to play around with the internal PID settings...

    https://www.youtube.com/watch?v=qYgnIKDoVPY

    Nick

  8. #28
    Quote Originally Posted by Nick View Post
    I'm having a hard time making sense of the Chinese-English hybrid manual. I would be using them in the "position mode" initially, have you had any issues with overshoot? Are you using "open collector input mode" or using the suggested "AM26LS31 similar line drive"? Or 0-10v? .
    I've used both Analog and Differential inputs on these drives, both work ok but Analog does require more work with tuning if closing the loop back to the controller
    If you're using a decent controller with Step & dir then you won't need to mess around with line drivers as it will provide differential outputs.

    Quote Originally Posted by Nick View Post
    I found the below video, which was bit concerning having to play around with the internal PID settings...
    Don't be concerned because it's quite normal to have to tweak the PID settings. Servos are tuned according to the load they have to move so it should be no surprise that some tweaking is needed as it's impossible for them to be tuned correctly at the factory or when sat on a bench.

    To how much tweaking needed depends on many factors including Input Mode and how or where the loop is closed. If using full closed-loop back to the controller then affectively 2 Pids have to be dealt with. First, the motor needs to be tuned to the drive using the drives PID. Then the position loop for the Controller needs to be tuned using it's PID.

    Don't be afraid of PID tuning it's not rocket science but does involve a bit of black magic to perfect. Mainly it's just tweaking few settings until it behaves how you'd like. Little patience is all that's needed.

    Edit: Checked today and the motors are the 600W version.

  9. #29
    Nick's Avatar
    Lives in East Yorkshire, United Kingdom. Last Activity: 3 Weeks Ago Has been a member for 3-4 years. Has a total post count of 25. Received thanks 3 times, giving thanks to others 0 times.
    Jazz thank you for your post, this makes a lot of sense, you've reassured me re the servos. I've decided on using the analog interface with Linux CNC, mesa 7i92 and 7i77 with the controller closing the outer loop. I might need some help with the tuning. I've bought 600w for the X and Y, I have also committed to the BT30 spindle with a 1.8 kw servo.

    Click image for larger version. 

Name:	download.png 
Views:	84 
Size:	1,009.6 KB 
ID:	27310

    Waiting for the servo for the spindle, pneumatic cylinder and mesa cards.

    Made a start on the pneumatics, I've gone with a "mist cooling" system using the water filter approach I found on the here, works well.

    Got a lot of time consuming jobs done, filled the spindle head with epoxy granite, got the y-axis movement working. Made a few chips with jogging.

    Next major problem is protecting the ways from chips, I've seen several designs. Would anyone be interested on collaborating on a way cover design?

    I've seen a few designs:

    Chris DePrisco made some with sheet metal: https://www.youtube.com/watch?v=3GSEayp8Ioo
    This looks very labour intensive

    This looks less labour intensive and less skilled, could potentially 3D print the sides: https://www.youtube.com/watch?v=G2DJ8RQy4D4

    This project (which is a bigger, much more polished version of mine) uses way covers from aliexpress (I found a link and I think they cost about 400), this could be emulated by putting sheet metal on cheaper bellow way covers: https://www.youtube.com/watch?v=nTC5gWVmt0o

    Then the simplest option is using rubber or a fixed cover with acrylic. Thoughts on this?

  10. #30
    Don't overthink the way covers they don't need to have scissor mechanisms. Just let them slide so push-pull each other in and out. Many industrial machines use this method and it works fine, the Fadal machine I have here just uses the push-pull method. Your welcome to look at or copy these covers which are off the machine.

    I'll take some pictures for you to see how they are made up.

    Quote Originally Posted by Nick View Post
    I've decided on using the analog interface with Linux CNC, mesa 7i92 and 7i77 with the controller closing the outer loop. I might need some help with the tuning..
    Do you have any experience of Linux CNC.? If not then get ready for a massive learning curve because with servos and closed-loop it's a different ballgame to Steppers. I'm very experienced with lots of controllers and I'm struggling big time with Linux CNC. Luckily I've got a Linux Guru in my camp working on it, hey Clive S . .
    Last edited by JAZZCNC; 03-02-2020 at 08:58 PM.

Page 3 of 6 FirstFirst 12345 ... LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Where to start? Vertical Mill CNC conversion.
    By Richard in forum Milling Machines, Builds & Conversions
    Replies: 6
    Last Post: 29-12-2017, 08:38 AM
  2. WANTED: Harrison mill Vertical head
    By D-man in forum Items Wanted
    Replies: 0
    Last Post: 18-06-2016, 12:43 PM
  3. Epoxy granite or mineral casting
    By mike mcdermid in forum Gantry/Router Machines & Building
    Replies: 46
    Last Post: 20-02-2014, 05:21 PM
  4. Epoxy Granite Molds?
    By gavztheouch in forum Moulding Machines
    Replies: 8
    Last Post: 18-02-2014, 06:28 PM
  5. BUILD LOG: Vertical fixed gantry. Design & build. (Steel/epoxy)
    By Greeny in forum DIY Router Build Logs
    Replies: 8
    Last Post: 19-08-2013, 07:26 PM

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
  •