Messages

1

General Mach Discussion / Re: Switches for Home position

« on: February 01, 2018, 06:21:33 PM »

Hi All,

I was thinking of adding a second endstop on my z axis and use the two to calibrate my steppers.  Anyone have experience with this technique?  I think the hysteresis of the end stops would come into play. 

Thanks

Gordon

2

LazyTurn / Re: Lazy Turn way of life?

« on: December 15, 2017, 05:16:38 AM »

Hi Rich,

Thanks for the heads up.  Will do.

Gordon

3

LazyTurn / Re: Lazy Turn way of life?

« on: December 15, 2017, 05:15:47 AM »

Eureka.  Thanks for heads up.  I had a feeling.

4

LazyTurn / Re: Lazy Turn way of life?

« on: December 15, 2017, 01:30:38 AM »

Hi Rich,

I've installed the hall effect sensor and I've got a good rpm reading in mach3.  There seems to be an odd problem with the index signal though.  I've only been able to get it to run through the thread cycle once.  I have been unable to run the cycle successfully since.  It just stops spontaneously.  It seems that if I've got a good RPM reading then the index signal should work properly as well.  Could it be signal noise on the BOB?  Does it matter if I'm using the demo version? 

I'm stumped. 

Thanks,

Gordon

5

General Mach Discussion / Re: Spindle index

« on: December 15, 2017, 01:03:19 AM »

I've installed a hall effect sensor on my spindle and the RPM's in mach3 match my hand held laser tachometer.  I've been attempting to adjust my index debounce value for almost a week.  The diagnostic screen shows an incredibly inconsistant index pulse.  It just refuses to stabilize.  I've even added a second magnet to lengthen the pulse to the system but it's just not reflecting a steady index signal.  Is this an electrical noise issue?  If this is the wrong thread please point me in the right direction.

This is a Sherline 4500 lathe, and my system debounce is set at 500 and the index signal is set at 10.

Thanks,

Gordon

6

LazyTurn / Re: Lazy Turn way of life?

« on: November 17, 2017, 10:11:17 PM »

Hi Rich,

Thanks for reply, I've got the tach ordered already.  I was hoping for a software solution to just bypass that for now.  I'm looking forward to having a hard tach DRO. 

Gordon

7

LazyTurn / Re: Lazy Turn way of life?

« on: November 17, 2017, 06:35:23 PM »

Yes I've built an attachment that allows me to quickly change from the standard VF DC motor to a high torque stepper.  By setting the spindle to step/dir I can control the stepper (power/speed) via mach3.  I've calibrated it, with a laser tach, to reflect the exact RPM's but without an integrated tachometer I don't get the control signal to engage the threading operation.  I want to just force the STrue to the spindle speed.  It really only has the needed torque up about 300 rpm's.  I've pulled out most of the backlash in the system and compensated for the rest in the backlash settings. 

8

LazyTurn / Re: Lazy Turn way of life?

« on: November 17, 2017, 12:08:38 AM »

Hi All,

Not sure if you can help me but I've set my lathe up with a high torque stepper to try some simple threading.  I've calibrated the spindle and can control it with mach3.  I don't have my tach yet and I'd like to lock the spindle speed to the STrue value.  Anyone know a quick way to do that?

Thanks,

Gordon