Messages

1

General Mach Discussion / Re: Spindle speed varies when moving axis - resolved

« on: March 16, 2011, 05:10:23 PM »

Hi All,

Just a quick update to let you know the current position.

After a number of emails with Arturo from CNC4PC, the board is being returned as faulty.  No amount of tweeking or reseating of chips made the slightest difference.

The replacement boards are from Peter Homman.

Regards,

Paul

2

General Mach Discussion / Re: Spindle speed varies when moving axis

« on: March 06, 2011, 08:47:54 PM »

Ho All,
thanks for your replies.
I've had another look this morning and tried your suggestion Hood - unfortunately, it didn't make a difference.

Gerry,

I don't think it's noise from the steep/direction lines to the stepper drives.  I've used a good quality screened pair cable that has been grounded in the middle of it's length.

Tweekie, I've rechecked the setup - I can get a stable and proportional signal on the 0-10v connection.  When rapiding, this value increases.  e.g. 5v at 1000 rpm. Rapiding increase this to about 7v and 1440 rpm.

I've monitored the 5 and 12 volt supplies with a DVM, and these look rock steady.

Enabling spindle feedback control works - sort of!  Ther's a momentary change of speed at the start and end of a rapid movement, while the controller gets a grip.  But I feel this is fixing the symptoms rather than the problem....

Has anyone seen this sort of fault before?


Regards,

Paul

3

General Mach Discussion / Spindle speed varies when moving axis

« on: March 06, 2011, 04:56:43 AM »

Hi All,

I've just replaced my CNC4PC 11G breakout board following a failure of the original.

When I move the axis (Z or X), the spindle speed increases. The amount the speed increases seems to depend on the speed of the axis, with about a 500 rpm increase when rapiding.

The problem was not there before the board failed, but that was about 18 months ago.

I have tried changing settings in 'ports and pins' for the X and Z axis as I recall that that might be a fix, but no joy.

I'm using the 0-10v analogue output from the 11G to a Mitsubishi VFD. 

Has anyone experienced this problem or know of a fix?

Cheers,

Paul

4

LazyTurn / Re: LazyTurn

« on: February 19, 2009, 01:24:58 PM »

Getting the following errors when opening any dxf file.  These were ok in the previous Version.

"CLazyTurnView
   An OpenGL error occured: invalid value"  OK out of that to get

"Warning no appropriate turning profile found"  OK out of that and you get in to a continuous loop of the first error requiring you to use task manager to quit LT.

Hi Art,
Seems the problem was only found when opening a file that was listed in the 'file' menu.  Open the same file from its original location, and it works. One the file has been opened from its original location, it works from the file menu too 
Cheers,
Paul

5

LazyTurn / Re: LazyTurn

« on: February 17, 2009, 06:04:24 PM »

Opps, Looks like I've broken something here  .  Tried the Feb 7th version and that's giving the same errors.  I'll look into it a bit further tomorrow.

Paul

6

LazyTurn / Re: LazyTurn

« on: February 17, 2009, 05:30:36 PM »

Hi Art,
Sorry to be a wet blanket...
Getting the following errors when opening any dxf file.  These were ok in the previous Version.

"CLazyTurnView
   An OpenGL error occured: invalid value"  OK out of that to get

"Warning no appropriate turning profile found"  OK out of that and you get in to a continuous loop of the first error requiring you to use task manager to quit LT.


Cheers,
Paul

7

LazyTurn / Re: LazyTurn

« on: February 12, 2009, 04:28:54 AM »

Hi Vince,

Try the following;
1. increase your stock diameter - there's not much to rough out in your screen shot.
2. In the rough profile dialogue box set pullout clearance, stock clearance and depth per pass to 0.1, 0.01 and 0.1
3. Try a 35Deg diamond tool with a tip radius of 0.01, and an inscribed circle of 0.2.

I appreciate that these settings might not be what you want to use, but should get you a result as below.

The line in the red circle is I believe part of the dxf profile that LT is working towards. A parting off operation is something for the future.  LT just does rouging cuts at the moment which consist of straight cuts parallel to the work axis.
Rgds
Paul

8

LazyTurn / Re: LazyTurn

« on: February 09, 2009, 03:45:32 PM »

Hi Art,

If I'm understanding correctly, this is an example that you can use for fault finding?  It looks good up to pass 3, but fails as shown on pass 4.  the file is one that was posted here a while back.
Cheers,
Paul

9

LazyTurn / Re: LazyTurn

« on: January 02, 2009, 05:13:05 PM »

Hi All,

I've just taken the last [EDIT 3!]days to read through this thread - amazing work folks!

Regarding art comments; whether using a hand ground or tipped tool, if it's handed, it's usually designed to primarily cut in one direction.  If I read Arts comments correctly then the issue is not just cutting on the back edge, but how much is being removed - post #630 illustrates.

If 'restricting' a left hand tool to only cut right to left is a way to achieve it, then I don't see this as a problem provided you can run another roughing path with a right hand tool (or whichever tool is needed) to remove the remainder of the bulk.

Sorry if this sounds as clear as mud - I'm just thinking how you'd do the job manually!
Paul

10

General Mach Discussion / Re: Lathe control panel

« on: November 27, 2008, 03:40:25 PM »

Found it!  And it was nowhere near where I thought it might be!!
http://www.cnccookbook.com/MTLatheCNCPanel.htm
Very smart keyboard Hood, lucky tinker . Looks the biz too!