Messages

1

SmoothStepper USB / Re: Lathe build now with a Smooth Stepper Maybe ???

« on: April 03, 2009, 01:07:32 PM »

With the SS will I still need a single index pulse on the spindle or will it be fast enough now for a 500 quad encoder with a 2 to 1 gear ratio. Encoder is on motor not spindle. Spindle max rpm due to voltage is 1350 rpm.

Donny

2

SmoothStepper USB / Re: Lathe build now with a Smooth Stepper Maybe ???

« on: March 31, 2009, 05:11:49 PM »

That's good to know it works. I will be ordering one tomorrow.

Donny

3

SmoothStepper USB / Lathe build now with a Smooth Stepper Maybe ???

« on: March 30, 2009, 08:35:01 PM »

I have converted a small 8x12 lathe by adding steppers with G202's and new ball screws on the X and Y.The spindle has a  Nema 34 DC Brushed Servo from HomeShopCNC with a G320.
Bob Campbell breakout board and a Sound Logic Encoder board. E2 500 count encoders on all axis including the steppers. Differential converters on the encoder lines to keep noise down.
I need the spindle to act as a lathe spindle sometimes and as a rotary axis other times. Now with a parallel port the spindle is limited to 650 rpm at 43khz. I think the 4mhz that a SS produces would be what I need.  Need more speed. I was wondering are there any hang ups going with the SS on a lathe in this configuration?
I read the manual seems like it would be very easy to hook up. Plus I can use my existing boards.

I don't want to end up with another paper weight like the G100 and the license I bought for it.

Donny

4

General Mach Discussion / Re: Lathe Servo Spindle settings question

« on: March 27, 2009, 04:39:04 PM »

Same tab you click on tho get to ports and pins and to motor tuning. Close to the bottom of the list.

Donny

5

General Mach Discussion / Re: Lathe Servo Spindle settings question

« on: March 27, 2009, 12:16:20 PM »

I can't seem to get over 650 rpm. Not 675. Would my calculations being wrong on the steps per be the difference?
   Now playing with the numbers in the Spindle Pulley screen: If I put a max speed 1000 then my actual speed is off. The only was I can get a accurate spindle speed is if I put in max speed is 650. Then when I type in a value of say 500 in the Manual screen I actually get 500 on my hand held tach. The Velocity in the Motor tuning page is set for 675.
If I put any other number in the Spindle Pulley configuration screen I get the wrong real numbers on the tach. WHY?

   Now how do I go about getting a faster spindle speed? Without changing my breakout boards etc. I spent allot of time and money setting all those up in my cabinet. I need increased speed without loss of resolution in the C axis Indexing.

Donny

6

General Mach Discussion / Re: Servo with Gecko320 blowing fuses

« on: March 27, 2009, 11:02:42 AM »

There is only one servo. It is on the spindle. I fuse it because I have always been told to fuse between source and use on anything electrical. Granted I wire houses not machines but It seemed valid. I need to rethink this I guess. Maybe I'll as Marris.

Donny

7

General Mach Discussion / Re: Lathe Servo Spindle settings question

« on: March 26, 2009, 10:34:58 PM »

At 2000 Velocity is 1350 Actual rpm 650
At 4000 Velocity is 675 Actual rpm is 650

Donny

8

General Mach Discussion / Re: Lathe Servo Spindle settings question

« on: March 26, 2009, 09:30:12 PM »

I didn't carry the index wire into the control box. Its at the plug I will just have to add it. No big deal. Just to see if it works. If not I have a few optical sensors laying around I think. I can do that. I did that on the last lathe I built. I was just hopeing the encoder would save a step.

The spindle has 2:1 gearing on it. Mechanical not Electronic. That is why I thought 4000 encoder counts not 2000.
Now if I put in 1000, 2000 or 4000 and jog the spindle in motor tuning I only get 650 rpm. Every time.  At every setting. On the Manual screen I have it set to 4000 rpm in the spindle setting. Under Pulley settings I have it set 0 to 4000 rpm.
What am I missing.

Donny

9

General Mach Discussion / Lathe Servo Spindle settings question

« on: March 26, 2009, 08:18:30 PM »

I have converted a small 8x12 lathe by adding steppers with G202's and new ball screws on the X and Y.The spindle has a  Nema 34 DC Brushed Servo from HomeShopCNC with a G320.
Bob Campbell breakout board and a Sound Logic Encoder board. E2 500 count encoders on all axis. Differential converters on the encoder lines to keep noise down.
X and y work fine. C index's fine. 11.11111 Steps per gives me 360 deg's  on the DRO.  Seems that might be a bit low of a number but it seems to work.
Now I set up the Spindle as a spindle and I believe I need to change the Steps per. so that 1 number of the dro is a full 360. To get that I have a Steps per of 4000. Now I am running at 45khz and that gives me a max limit of 675 In's per Min. Somewhere I read that 50 In per min was 3000 rpm. I am just not getting close to that If I set my spindle speed to 1000 I only get around 75 rpm. Haven't broke out the tach yet to check but its way to slow.
On ports and pins there is 4 encoders settings. I assume that's X,Y,Z,A. I just put the pin numbers in for the C axis in the 4th slot. Now where do I put the encoder information for the spindle? I am not getting any spindle feedback on the screen.


While on the subject of encoders. Is there a lathe screen that has X,Z,C with a spot for encoder feedback. I found a Mill screen that has XYZA but I need this for the lathe.

I'm not using The Sound Logic Dll because its not working for me. Want to get these other things addressed first. One small step at a time to keep it simple.

I have went through the manual but have not found or if I did find understand the info about the above questions. I also searched the forum with little success.

Donny

10

General Mach Discussion / Re: Servo with Gecko320 blowing fuses

« on: March 26, 2009, 07:36:15 PM »

I do have the power supply fused on the input line. I also have fuses before the G202's and the G320. So looks Like I need to move the lines around and put those fuses between the geckos and the motors?

Donny