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Messages - Graham Waterworth

2461
VB and the development of wizards / Re: Macro in background
« on: September 29, 2006, 12:51:34 PM »
If you look in the manual under macropump that should do what you want.

Graham.

2462
General Mach Discussion / Re: Accuracy Considerations
« on: September 27, 2006, 07:26:34 PM »
How long is a piece of string!

There are many factors to the answer, here are a few

1. Is the machine worn
2. Are you using leadscrews or ball screws
3. Is there backlash, yaw, twist, etc.
4. What ratio of motor to screw

The list goes on and on

Mach is not the limiting factor, Mach will work to .0001" or less.

Its like this, make the machine accurate and Mach will do the rest.

Graham.

2463
Tangent Corner / Re: max torque or continuous torque for design
« on: September 27, 2006, 03:16:36 AM »
It takes far more torque to start the gantry moving than it dose to keep it moving,  then you have to think about the ratio of the motor to the shaft a 2:1 ratio in effect halves the starting torque required.

Graham.

2464
General Mach Discussion / Re: Spindle Start Macros
« on: September 26, 2006, 05:19:15 AM »
I don't understand!

If mach can stop the spindle why can't it start the spindle?

The relay must be cutting the power to the spindle somehow for it to be able to stop it at the bottom of the hole.

Can you post some photos of how all this is wired up.

Graham.

2465
General Mach Discussion / Re: Spindle Start Macros
« on: September 26, 2006, 02:14:21 AM »
What is setting "Input2"

If the G84 cycle is calling M4 to reverse the spindle and Input2 is active it will continue moving.

Graham.

2466
not the acceleration but the distance over which it is done.  It might need more time to get to full speed. If it can't overcome the mass quick enough then the motors will loose step.

Graham.

2467
As your velocity in x & y are very similar I would try setting the acceleration for x more like your y figure.

Graham.

2468
If it only happens after long periods of use, is something getting hot and sticking?

or

is something short of lubrication?

Graham.

2469
Try increasing the acceleration and deceleration time, it may be skipping on short rapid moves.

Graham.

2470
General Mach Discussion / Re: Mach 3 for vertical lathes?
« on: September 24, 2006, 06:03:36 PM »
You can modify all the screens in Mach by using the Screen editor, this can be downloaded from the download tab at the top of the forum.

Graham.