Re: Nico's PM-25 CNC Build
Thanks for posting, got any videos?
I have a 2 axis Acer knee mill (Bridgeport clone) in excellent shape, but keep coming back to these 25 cnc conversions. I really would like 3 axis to play with
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Re: Nico's PM-25 CNC Build
I have a few videos on YouTube.
Here is a link to that channel:
https://www.youtube.com/channel/UCL6...TdHHRC02FUttzA
Re: Nico's PM-25 CNC Build
Thanks
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Re: Nico's PM-25 CNC Build
It has been a while since I have posted anything here.
Two big changes to the machine are the Clearpath servo motors on each axis and the automatic tool changer.
The servos give me about 400 IPM in the X and Y, and the Z is able to move about 250. I am only using a 48V power supply, so those numbers should increase when I get a clearpath 75V power supply. I am very pleased with the servos. It is excellent having the machine not lose its position if it crashes and never having to worry about lost steps because I pushed it too fast.
The automatic tool changer is an umbrella type tool changer on some round linear rails. It is actuated by a dual action air cylinder and rotated by a stepper motor. It holds 10 TTS tools. I am still working on the programming for it, but it will be controlled using an arduino responding to commands from the linuxcnc control computer.
I posted a few videos showing the machines old and new rapids and some motion testing on the tool changer.
https://www.youtube.com/watch?v=qHFJee4_-Gc&t=4s
https://www.youtube.com/watch?v=4EZNl0tpySg
Re: Nico's PM-25 CNC Build
@shooter123456. What is the model number of those Clearpath servos?
Re: Nico's PM-25 CNC Build
CPM-SDSK-2321S-RLN on the X and Y, CPM-SDSK-3421P-RLN on the Z.
Re: Nico's PM-25 CNC Build
Nice machine and nice work. Sound like you have a good grasp on it. I just received my clearpath motors for my pm940. My pm940 just came in a couple weeks ago so I can get ready to do a conversion on it. I have most of what I need but have to buy some ball screws. I have some AC bearings ordered so I can figure out everything. The 940 is a huge heavy mill and should make for a solid conversion. I will eventually build an enclosure. I have thought about using some 80/20 t-slot extrusion for the enclosure's upper frame. Do you know how you will build your enclosure?
Re: Nico's PM-25 CNC Build
I have been working on the enclosure for a couple of weeks now. It uses steel square tube as a stand and sheet metal for the body. This is only my second excursion into welding and the first time I have worked with sheet metal. It will have a chip tray on drawer slides under the machine and the tray will have a drain for the coolant. I have not yet picked out a container to use as the coolant tank, but it will probably just be a plastic storage container. I am still trying to figure out how to do the doors, but I am thinking an aluminum frame with an acrylic sheet in the middle, then drawer slides to open and close. If you would pardon the mess, I have a few pictures of its progress.
https://i.imgur.com/uGFqp66.jpg
https://i.imgur.com/9me7Io3.jpg
I also made a little adapter to hold the solenoid for the air blast I have been using. The mist coolant doesn't clear chips from holes very well, so in those cases, I use compressed air in addition to the mister.
https://i.imgur.com/2ZlTSPH.jpg
https://i.imgur.com/ghWIVW8.jpg
https://i.imgur.com/3rgjSSO.jpg
I am also working on re-doing the electronics enclosure. It was pretty tidy when I started, but as things were added, removed, and changed out, it has gotten messier and messier. I am going to rewire everything, get proper connectors for everything, and hopefully get it all cleaned up and organized.
I am having trouble deciding how to replace the way covers. I tore through the stock ones within a few months, and am currently using a shower curtain as a temporary solution. I don't love the accordion ones because they seemed to tear pretty quick and they like to catch and hold on to chips. The sheet metal ones look like the best option, but they are either expensive or difficult to make work well. Anyone have any suggestions?
Re: Nico's PM-25 CNC Build
The Novakon pulsar has a sheet metal cover for its Y axis you can buy for $85. You could see if they'll give you a drawing of the flange to see if it will fit.
Another option would be shielded bellows.
https://www.novakon.net/collections/...-y-axis-pulsar
Re: Nico's PM-25 CNC Build
Getting close to the end with the new enclosure. I have finished up most of the weld work, got the front opening all framed up, got new sliding rails for the doors, resized the doors from the old enclosure for use on the new one, mounted the doors, siliconed the corners where there was no sheet metal overlap, fabricated the chip tray, and I am now working on cleaning it up and getting it ready for paint. A few places will need body filler, but I am hoping the end result will look pretty good. I am planning to add the flood coolant tank and plumbing after painting everything and getting the machine moved over. The paint on the mill is looking pretty rough in some places, so the machine will also get a fresh coat along with the enclosure. I am planning to do the machine and lower part of the enclosure in gray and the upper and inside parts of the enclosure in white. I am picking white mostly because it will keep things bright inside.
Here is the enclosure almost as it stands now. There is a little chip chute to funnel the chips into the tray which will sit on tracks below it.
https://i.imgur.com/REF8me6.jpg
Here is a look at the inside looking down. The tape is there to help get nicer edges from the silicon. You can see the chip tray below and the chip chute as well.
https://i.imgur.com/UmGLhE9.jpg
Here is another view of the chip tray down below. The tray will sit on sliders so it will be up a little bit higher. The gap should be about an inch, so hopefully it will manage to contain the majority of the chips.
https://i.imgur.com/3tXtDdj.jpg
Just another look at everything. The doors mount to the .25" steel bars running across the top and bottom. Half inch steel square tube frames up the left and right side of the opening to stiffen everything up a bit and get rid of the sharp edge from the sheet metal. I am planning to add a piece of sheet metal folded over the bottom edge of the opening to protect that as well.
https://i.imgur.com/96wVdPW.jpg
I got a bunch of new connectors and such for the new electronics box as well. The number of connectors needed really adds up quick... I am hoping it will be worth it when I don't need to deal with the complete birds nest of wires running every which direction currently.
Right now I am thinking the control panel will be mounted up on the front right, then a tool rack and accessory rack will be mounted to the left side. I got the casters in recently, so those will also soon be added to the frame.
I thought I had pictures of the doors, but it looks like I do not. I will be sure to take some and add them. The door frames are made of aluminum and the windows are acrylic. I will be making some handles soon similar to the ones on the new tormach enclosures. There is still plenty of work to go. Need to figure out the automatic lubrication for the machine, way covers, motor covers (and waterproofing for flood coolant), control panel, head cover, spindle pulleys, air routing and control, and touch probe. I am sure that list will grow before I finish...