Messages

1711

General Mach Discussion / Re: Mach Turn Radius compensation

« on: February 27, 2008, 04:00:42 AM »

Hi Guys,

I will try and correct a few points about tool compensation in turning.

1. Compensation on a lathe is in no way the same as milling.

2. Tool comp on the lathe has no effect on the diameter of the work.

Lathe tools have a nose radius, this can be set to 1 of 8 tip directions in the tool offset table along with the actual radius of the tool tip.

A standard finish turning tool is set to 3 an internal tool is set to 2.

Radius comp is there to compensate for the error between the programmed change point and the actual contact point of the tool.  This sound odd I know but without it angles and rads are the wrong shape and size.

Now the crunch.

I have never got Mach to work properly, I think there are major issues with comp in lathe,  I need to talk to Brian and Art about this while Lathe is getting some attention.

Graham.

1712

General Mach Discussion / Re: Update Tool Data using G10?

« on: February 27, 2008, 02:45:52 AM »

You can use G10 in 2 modes G91 incremental and G90 absolute.

So using G90 you can set a value, in G91 you increment/decrement the existing value.

Graham.

1713

General Mach Discussion / Re: Slow table speed !

« on: February 26, 2008, 11:43:43 AM »

Look at these :-

http://www.miteebite.com/

Graham.

1714

G-Code, CAD, and CAM discussions / Re: Drawing an Airfoil for LCam

« on: February 26, 2008, 11:35:37 AM »

I have never used LT but on my system I do a "create spline from points" command and it fits the best curve it can between the points.  Then I do a convert spline to lines and arcs.

Graham.

1715

Tangent Corner / Re: Product Idea (Your input needed)

« on: February 26, 2008, 07:34:20 AM »

No protractor, its what us engineers call 'rack of the eye' or in Yorkshire 'rek u't e'

Graham.

1716

Tangent Corner / Re: Product Idea (Your input needed)

« on: February 26, 2008, 03:30:33 AM »

The universal looks OK but you have to remember that the roof lights and windows in some shops will cause the LCD to be bleached out, I had to have shrouds made for some of the machines so we could see the screens.

They are better mounted at 95 degrees than at 70.

Graham.

1717

General Mach Discussion / Re: Slow table speed !

« on: February 26, 2008, 03:17:36 AM »

Change the clamping system, or the human.

Graham.

1718

General Mach Discussion / Re: A million dollars to the person that can help me.

« on: February 26, 2008, 03:06:23 AM »

Are you using 2 parallel ports, if so, is the second one configured for just inputs?

Graham.

1719

Works in progress / Re: New Diamond Plate Mill Screen

« on: February 24, 2008, 07:13:28 AM »

Looking good,  OEM code 333 changes the DRO's to show distance to go.

Graham.

1720

General Mach Discussion / Re: cumulative movement

« on: February 24, 2008, 07:07:59 AM »

G91 B1. will always feed 1. more in plus direction for last position.

Graham.