Thread: Chris's 2nd Build "Big K4huna"

Everything is almost level now (or the best I can tell with the uneven ground) Just 1 side of the legs need to be pushed back a little more as when the ram was released and the welds pulling it . . well you get the picture.


Ran out of Argon today so I cant do anything till monday.


Simso, we pretty much did it this way, but when it was moved the horses were not remeasured, so im not sure but I think this is where something may have happened as it had all my ???? welds on top. Next build I will pay more attention.


Once I get some argon and finish the welding, just gota do quite a bit of grinding and then I think it might be ready for painting.

Came home today to a package

My motors and PSU's


4x ~423 oz-in Nema 24
2x 906oz-in Nema 34
4x 48V 6.7 Amp PSU (1 for each motor)
1x 906oz-in Nema 34 (5:1 reduction)

I wanted 3:1 but they didnt have it in stock so I settled for 5:1 as I didnt want to wait an additional 21 days

They are actually alot lighter that I thought they are only about 1kg more than the nema 24.

I also got the pulleys from econobelt but they wernt as fun to recieve as the massive motors.


They sent me 8 wire motors instead of 4 wire is there any problem hooking these upto the Gecko 201's, Its just the Nema 34 motors the Nema 24's are all bipolar

You can hook the 8 wires up as unipolar or in a couple of variations of bipolar.

Originally Posted by echnidna

You can hook the 8 wires up as unipolar or in a couple of variations of bipolar.

But if I hook it up in bipolar I loose some of the power right?

Opps, my error

I actually got them to change the model

http://kelinginc.net/KL34H295-43-8B.pdf

It was changed to the Keling because it had slightly higher Amps 6.1A and lower voltage 2.1v (in Parallel)

The Max. applied Voltage can be up to 20-25 times of Rated Voltage

So according to that back when I ordered them my 48V and 6.7 Amp PSU's were just right.

Originally Posted by Ch4iS

But if I hook it up in bipolar I loose some of the power right?

Nah if you hook them up Biploar Parallel you will get all the grunt but your drivers have to be able to handle the amperage. Your motors in Bipolar Parallel are 6.1 amps/phase and Geckos 201's can handle 7 amps and 80 volts so you are OK.
If you go here it shows how to wire your motors bipolar parallel and the colours of the wires to hook together.
http://www.kelinginc.net/KL34H295-43-8B.pdf
I would be cautious about using the same colour codes for another motor and would check a data sheet before wiring up.

Some pics of it grinded down with the rails and racks attached.

+ a new toy I got but cant use till I get my own factory.


Next to do is to design the Gantry sides and make a prototype out of MDF before I cut some aluminium plate (probbaly a few days work) But my current cnc router cannot cut aluminium so I might try getting someone to cut it for me.

A nice coat of black paint will cover up all my nics ect with the grinder. Cant do this either till I get my own place

Hi Chris,
Coming along nicely there.

Once you start seeing some movement it gives you the incentive to keep it going.

I have the HM45 mill which looks the same as you one - different colour.
I have had it for a couple of years and it has served me well.

Originally Posted by rodm

I have the HM45 mill which looks the same as you one - different colour.
I have had it for a couple of years and it has served me well.

I thought I saw one in a pic of your shed, but I thought you had the X3?

Or do you have both and the X3 is your cnc mill?

Or am I just getting confused.


Did yours come with a bad paint job in some areas?

No you are perfectly clear in your thoughts.

I have a standard HM45 and a X3 which is Cnc'd. Attached is the X3 which I have done some more work on recently - moved the electrickery to outside the enclosure. The X3 sits in the carport as there wasn't room in the shed.

Paint is good on my machine.

I'm corrupting your thread. Probably the wrong emotion as well as I never know what to put there.

Damn its so quiet so I thought id ask a question.

http://cgi.ebay.com.au/BENCH-METAL-L...1%7C240%3A1318

Just looking for a small lathe that can be converted to cnc. I found this cheapo one on ebay and it doesnt look half bad apart from the weak motor. BTW catch is stock might not be readily avaliable he also has a 700mm "centers" one for a few hundred more.



BTW currently moving all of my gear to my own factory so I wont be able to work on my build till its all moved.

Hi Chris,
I don't think a geared head lathe is the way to go for CNC. I have seen 3 converted CNC lathes and all of them are the Hafco 9 X 20 or AL50G models.
You could also consider the Seig C6 lathe or AL60 in Hafco numbers. Personally I think the C6 is a better lathe than the AL50.
Ultimately you will want a servo motor as a spindle drive so you can do all your threads and indexing. The geared head will get in the way of this.

I agree with rod on this one, Ive converted an al50 and dont get me wrong its fantastic, but slightly bigger is always better, if you have another lathe its not an issue, the al50 is sufficient.

If you dont have another lathe then maybe get a bigger lathe to convert and make it dual purpose, cnc and manual that is.

Curently Im using my cnc lathe to turn out clarinet mouthpiece blanks for the wifes business, we havent worked out how to do the baffles and all that inside yet, but getting there

Rod.
In your photo of your X3, there is some wobbly jointed plastic tubing shown at the back ... probably for coolant or something! Would this stuff be any good to direct a jet of air onto the router bit to clear the cutting area? I think that you suggested a jet of low pressure air to someone engraving brass.

What is this tubing's proper name?

Cheers,

Alan