Messages

11

General Mach Discussion / Re: PWM Spindle Fluctuation

« on: August 01, 2012, 09:09:10 PM »

Just tried it. No change.

It's worse the higher up in RPM. Very strange. It only does it when I move an axis.

12

General Mach Discussion / PWM Spindle Fluctuation

« on: August 01, 2012, 05:42:47 PM »

I have my spindle setup with PWM output to a Digispeed XL and finally to a GS3 VFD. The problem is the spindle fluctuates only when an axis is moving. If the machine is still the spindle is stable. As soon as it makes a move on any axis, the speed drops. Any ideas?

Thanks

13

VB and the development of wizards / Pulley Selecting

« on: July 19, 2012, 03:12:51 PM »

Is there way to select pulleys within a brain?

14

VB and the development of wizards / Re: Looking ahead into Gcode

« on: July 15, 2012, 03:31:52 PM »

Alright thanks. The tool changer will have random positions. I need to figure out how to keep track of what tool is in what pocket.

15

VB and the development of wizards / Re: Looking ahead into Gcode

« on: July 15, 2012, 11:10:37 AM »

Yes exactly, how can this be done in VB?

16

VB and the development of wizards / Looking ahead into Gcode

« on: July 12, 2012, 09:09:27 PM »

Is there a way to have a script look ahead in a Gcode file and look for the next tool to be able to stage it for the next tool change? Pretty much how commercial VMC's with side mount tool changers do it.

17

Brains Development / Re: Rapid OverRide OEM DRO

« on: July 12, 2012, 04:14:37 PM »

Thanks Hood, it works perfectly. The "1000-2255 valid" threw me off.

I appreciate it.

18

General Mach Discussion / Re: Can someone explain how a capacitor acts as a filter?

« on: July 07, 2012, 07:38:12 PM »

Well, off to radioshack. Thanks a ton Ray, hopefully this solves my issues.

19

General Mach Discussion / Re: Can someone explain how a capacitor acts as a filter?

« on: July 07, 2012, 07:15:27 PM »

Very clear, thank you for the analogy. One question though, would using a smaller capacitor have the same effect as using a smaller water tank, given the analogy? Reason I ask is I'm trying to filter noise on some encoder inputs. I have 1uF caps but the delay in the encoder getting the signal to the computer is too large and causing inaccuracies. Would a smaller cap reduce the delay?

Way back I learned all about capacitors and such things of the electronics world, but when you don't use it frequently, the information tends to fade.

20

General Mach Discussion / Can someone explain how a capacitor acts as a filter?

« on: July 07, 2012, 02:21:02 PM »

Preferably on breakout boards. I accept the fact that if you place a capacitor between the input pin and ground, that it will act as a noise filter. However I don't understand how this actually works. Anyone care to explain?

Thanks