K2CNC Summary

[tauscnc]

Hey Robbie,
For my MDF top I use 6 bolts on both sides. I would like to also put 2 bolts on the crossbraces but that more work Someday. Not sure if I need 6 but that is what I came up with.

Hey ger21,

The motor are rated at 24v 2800 rpm. Once I see my bro today and get his oscilliscope and get the setup "perfect" I will give my inital views. So far I like the servos, they are quite and I can run them at max without them skipping or missing.
I am using 24V and when rectified its 33.93 V (my voltmeter says 37 ish). I talked with Kevin at K2 and he said that is what they also use and when you consider the PMW or PWM (something like that) from the motor it decreases the volts to a save amount. Sounds good to me

I tired the computer (900 mhz) at 25K and it was half the speed of the steppers setup. I tired the computer at 35K but never at 45K when I had the STEPERS and it would lock causing the steppers to go full out.

For kicks I tried the computer at 35K and it works fine with the SERVOS...so then I pumped it up to 45K and it still works fine. I have ran (dry) 4 five 5 files and all sees great. I am getting about the same speed at 45K as I did at 25K with the steppers and the switched around pully setup. However my resolution is twice that with the current servo setup. If I can keep this setup going I am quite happy. Its quick and does not stall.

I am not sure it if is healthy for me to run the computer at 45K but it seems to work. I am sure if I was cutting a real piece it would stall I think with the encoder any blips etc., are handled. REALLY COOL.

The servos sound like silk. 1:1 ratio with 45K would be a killer speed but I can just see the Y axis (39") leadscrews whipping around.

thanks
taus

[ger21]

Originally Posted by tauscnc I am not sure it if is healthy for me to run the computer at 45K but it seems to work. I am sure if I was cutting a real piece it would stall I think with the encoder any blips etc., are handled. REALLY COOL. taus

Do you get the same speed at 35Khz as with 45Khz, or is 45Khz faster? If they are the same, use 35Khz. Neither will harm the computer, either they'll work or they won't. But you should always use the lowest speed setting possible, to give the computer a little breathing room.

[tauscnc]

Hey guys,

I finally cut a holder for my dremel tool. There are many times I find I don't need to run the porter cable router due to the material I am cutting and well...noise. The dremel tool is much quiter and I think might get me by for a lot of the things I like to make (engraved signs, foam airplanes, etc.).

I have to get a top mount still done and will post a dxf if anyone else wants to make one.

Here are some pics:

Dremel Mount 1

Dremel Mount 2

You can see the whole making HERE IF YOU LIKE

time for bed!

taus

[bradyfb]

Hey, where are you buying the upgraded ballscrew and ball nut?

[tauscnc]

Hey bradyfb,

I think at least here on the k2 stuff people are getting them from k2. You might want to call k2 and see if it fits your machine or if they can cut something for you to fit it.

taus

[ballendo]

Hello,

The original Air Force standard for NC--and later CNC--machines says that the axis with the longest TRAVEL, OR the axis capable of handling the longest dimension of a workpiece is properly called the X axis...

The Z axis carries the tool, and the Y is what's left...

So you can have a gantry or bridge style machine with a short travel OF the gantry or table--y is actually longer in travel--and the shorter axis will still be properly called the X axis. Because it can handle a part of longer dimension, since it is not limited by the uprights of the bridge or Gantry, as is the case with the Y axis.

More than a few folks "prefer" to call the "across" movement, X and then call the "towards/away" movement,Y; regardless of travel length. Even some manufacturer's; especially those making plasma machines, IME, seem to do this.

If you take the time to consider all the possible names you can give to the axes AND the repercussions/results of each, IMO you discover that the original standard makes sense.

If you stand at the left side (looking from the front) of a "properly" named Gantry of bridge cnc machine; you'll look at your work being cut in the same orientation as the screen shows it... Perhaps more importantly, you'll BE off to the side. Out of the way of yourself... And the machine. Safer. And correct.<G>

Another point is what this does with the "home" position.

In a "properly" named and oriented machine, the home position--in it's typical minus end of the XY axes for this type of machine-- will be left rear when you stand in front (where you'll load and remove work). In other words, when th emachine goes to home, it CLEARS the way FOR you to add or remove material...

And when you're setting up, the home point is right in front of your keyboard/screen...

BTW, If you use the positive ends of the travels for home--as is done in most metalworking machinning centers-- you're still clear.

I've seen some guys say that it's more "comfortable" tohave the "across" be X and the toward/away, Y. I say that if you're learning anyways, why not take advantage of what 60 years of pretty smart folks have discovered???

It isn't always OBVIOUS to a beginner WHY some thigs make sense; they find that out later... And this is true of FAR more things than CNC... Any coach has had the task of explaining that hwat's "comfortable" NOW, will very likely lead to "problems" later.

Baseball grip in golf, anyone?<G>

Why set yourself up to have to mentally "rotate" when you wanna cut that larger part? You know, the one which will "fit" just fine no matter what, if you stand on the shoulders of the giants who've preceded you in this CNC endeavor...

There ARE reasons that in about 60 years of development, CNC folks have made some things "standards"...

Hope this helps,

Ballendo

Originally Posted by ger21 Just that X is usually the longest axis. You can call them whatever you want, it only gets confusing when two people have them named differently and are trying to understand what the other is talking about.

[turmite]

ballendo,

Good to see you post again. Been a while. As usual you are full of good info, although I am probably one of those that didn't learn correctly from the beginning. I started out with a Digital Tool machine, still have it and it's still making parts. It was already set up with the y axis being the long axis, the x the gantry and home in the minus to my left facing the machine. You are 100% correct that in this configuration I had to move the gantry to load and unload the table. I wish when I had started this journey there had been sites like this and folks like you. Just wanted to say hi and thanks.

Mike