Thread: CNC Router Build Steel & Ally

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.

just so I get to watch

Nice build

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.

Did you fall asleep for a bit there Chris?

Originally Posted by Bob Willson

Did you fall asleep for a bit there Chris?

Just a little

The 2 months just seemed to fly by.

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
Russell

Originally Posted by rusel

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
Russell

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.

Thanks Chris, I have sent you a PM

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.

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?

Originally Posted by seafurymike

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?

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.

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

Russell

Originally Posted by rusel

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

Russell

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.

Thanks Chris
All put in to the think tank
Russell