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Messages - Adam_M

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71
General Mach Discussion / Re: Homing and Home Offset
« on: February 02, 2014, 07:15:21 AM »
1) The only way to rest machine coordinates is to home the machine. Clicking Ref All is all you need to do. You can';t zero machine coordinates any other way than homing.


So Machine homing has to take place at each start up of the machine or in the event something goes wrong in order for it to know where it physically is, correct? Essentially "REF ALL" sends the machine to the home switches where the axes can then be set to zero.


2)The Offsets are in machine coordinates, so if you click the Machine Coordinates button after homing, you should see 2,2, and -1 in the DRO's


This is exactly what it does from a visual perspective on the screen in the DRO's but the machine is not physically doing this, however the machine is not offset from the home switches 2", 2" , 2" and 1".


Adam,

72
General Mach Discussion / Homing and Home Offset
« on: February 01, 2014, 08:58:18 PM »
I've got my machine homing quite nicely now thanks to the members but I have 2 questions about the normal operating procedure and the Homing Offsets.

When I click on the REF ALL HOME after a reset my machine will home all 3 axis as well as run a home offset.

1) Should the normal procedure for the initial start up of the machine be to REF ALL HOME and if using the "Machine Coord's" click that button and zero all the axis? Does the Machine Coord's always need to be reset at start up?

2) My machine is set to inches and my Home Off. in the Motor / Soft Limits is set to 2.0 for x/y/a and -1.0 for z. After the REF ALL HOME I am assuming this is when I should see the offsets put into place however they are much smaller offsets than I have set, not sure what is not correctly setup, any ideas?

Thanks.

Adam,

73
Many thanks for the additional information.

With your additional comments its helping fill in some of the blanks.

I'll now just need to dig in and get a feel for how the machine reacts and what the sweets spots are...

Adam,

74
Thanks for the reply's, a couple of follow ups..

My setup consists of a slaved A Axis on X Axis and I'm sharing Limit and Home switches.

Quote
"When you Home the machine to the Home switches, Machine Zero is set. The Softlimits are in relation to Machine Zero."

Would the benefit to a Softlimit come for users with a single switch on each axis, machine Zero?

Quote
"So after homing, when my home switch is then acting as a limit switch, I can go to the zero position on the axis and still be .5" away from the switch. If you then set softlimit min to 0, the machine will stop before it gets near the physical limit (home) switch."

Is this to keep it from triggering the Limit switch since you share Homes and Limits?

Quote
"X and Y axis it would be 0 for Min and the travel of your axis for Max
Z  it would be 0 for Max and your axis travel for Min but as a negative value."

Is the travel determined by a physical measurement or simply by jogging the axis and determining the length from the Home switches on the axis?

Quote
Slow zone is the distance the axis will start to slow down when jogging if you are heading towards a soft limit.

Does this hold true for all movement weather it be in GCode or using a pendant, etc.?


For the Z axis, "0" is that determined to be the absolute "0" without bit - trying to get a mental picture?

Adam,

75
First post on the forum so go easy please.

I'm a newbie to the CNC world and have some rather simple questions I hope about homing and limit switches when setting up MACH.

- Are the "Soft Max/Min" set from the distance of the Limit switch or Home switch?

- Is the "Slow Zone" the distance before it hits the Limit switch or the Home switch?

- Is the "Home Off". used to set a distance from the physical Home switch?

I realize that MACH enters default settings but I was hoping someone might share what their settings are and how they came to those conclusions.

Thanks for any and all input..

Adam,

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