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Thread: CNC Router Build Steel & Ally
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27th January 2013, 12:06 PM #31SENIOR MEMBER
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Thanks , just wondering but does anyone know if I'm asking for trouble by mounting the Hitachi X200 VFD in the same enclosure as the drivers and possibly also the pc? I was planning to put a three sided shield around it but now I'm thinking it might be best to add a separate enclosure for the VFD only. (I might knock out that blank panel on the front and add a second door)
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27th January 2013, 12:42 PM #32GOLD MEMBER
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Hi Chris,
I always place the VFD away from the other electronics. I also run a separate power supply from the wall outlet to the VFD as I had problems with backfeeding the 240v on power down on one machine. Probably easier to do now than try to track EMI after the build. If you do end up placing it in the electronics enclosure note that the cheaper quality VFD's only have a plastic case so at the very least put a sheetmetal shield around the VDF.
Like your work BTW and looks like you have mastered the welding.Cheers,
Rod
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27th January 2013, 01:28 PM #33
just so I get to watch
Nice build
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4th April 2013, 09:38 PM #34SENIOR MEMBER
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Painted and now I'm finishing off the X axis plates. Hoping to have the X axis ballscrews attached this weekend, just 2 small plates left to machine.
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5th April 2013, 10:00 AM #35
Did you fall asleep for a bit there Chris?
Bob Willson
The term 'grammar nazi' was invented to make people, who don't know their grammar, feel OK about being uneducated.
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5th April 2013, 04:37 PM #36SENIOR MEMBER
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7th April 2013, 10:29 AM #37
Chris I am looking at a very similar design and I was wondering what the drive spec on your cnc is, Motor size, accelerations, top speed,,,,,
This will give me some idea to use with my design
Thanks
Russellvapourforge.com
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7th April 2013, 12:36 PM #38SENIOR MEMBER
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Dual Nema 24 387 oz-in on the X axis, Nema 34 640 oz-in on the Y axis, and Nema 23 269 oz-in on the Z axis
Drivers, G540 with a removed G250 will solder wires and bring them out a G201X to run the 640, I don't see why this wouldn't work
No idea on speeds at the moment, but I'll most likely have 1:1 ratio with the 5mm ballscrews so that should give you some idea based on other machines, speed is not very important to me as I'll mostly be machining aluminium.
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20th April 2013, 07:25 AM #39
Thanks Chris, I have sent you a PM
vapourforge.com
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20th April 2013, 10:17 PM #40SENIOR MEMBER
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Some latest pictures.
Currently working on the electronics, the remaining X axis plates have been drawn up, just need to find the time to machine them.
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22nd April 2013, 04:53 PM #41
That's going to be one rock solid machine Chris. You mentioned the original was too small, what are you intending to machine with this unit or does it require a secret squirrel password?
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22nd April 2013, 06:37 PM #42SENIOR MEMBER
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I wanted to make a small machine to possibly sell, the machine uses long pieces of flat bar with holes and slots milled, I did attempt to make it without the cnc but my drilling/milling was far from accurate.
Surprisingly I don't have any pictures but here is the 3d model to give you an idea
There is also another base made of PFC and RHS welded together I'm looking into.
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28th April 2013, 02:22 PM #43
Chris
Thanks to you have started to draw up my cnc and I have a few question. Ones that you have already thought through.......
What size was the square tube you used?
I see that you have 1200oz motors any reason for not using them?
I see that you used different rails on x and y, Why?
Your method of tramming is?
Will make my own bearing blocks as I did when I converted the 45mill to cnc. This allowed the motor mount to be customise into the bearing mount. Works well.
Thanks for your advice in advance
Russellvapourforge.com
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28th April 2013, 03:50 PM #44SENIOR MEMBER
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1. 75x75x2.5mm RHS
2. The ballscrews have a pitch of 5mm and I'll most likely be running 1:1 ratios so they don't need a whole lot of power, I went a 640 on the Y axis because I had a used unit available, it isn't as long as the other nema 24 motors and because of the added weight of the 20mm ballscrew.
3. Round supported rails on the X axis because the PFC is not perfectly flat or square, the round rails in my opinion can deal with that better than the square rails, but I have seen some machines with the Square linear rails mounted to the PFC so don't let my decision stop you. For the Y axis I was originally going to go one round rail and top and one square rail on the side but because of the frame design I needed the space up top for the ballscrew, when I originally drew the frame up in sketchup I didn't plan past the frame itself.
Hope that helps.
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3rd May 2013, 11:03 AM #45
Thanks Chris
All put in to the think tank
Russellvapourforge.com
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