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?

You would not care.
Also, you need to make sure you dont overtravel into the switch.

On 03/03/2015 16:19, Spencer Chase lists@...
[mach1mach2cnc] wrote:
> if you hit a limit, isn't it pretty much time to reset? why would you
> care if you were off by a few mm, you probably screwed up if you hit
> the limit anyway?
>
> i am wondering about all this because i do want to do proper limit
> switches on my machine at some point so i can home reliably. i will
> probably stick with the hall effect switches if i can stiffen up the
> arm that the X axis limit switch uses but if i do use microswitches i
> might want to debounce them? since mach3 does software debouncing it
> is probably not a good idea to add another possible point of trouble.
> i use software debouncing in all of my arduino machines and it works
> just fine and is very configurable.

--
-hanermo (cnc designs)

--

Best regards, Spencer Chase
67550-Bell Springs Rd.
Garberville, CA 95542 Postal service only.
Laytonville, CA 95454 UPS only.
Spencer@...

(425) 791-0309

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?

Yes, its a parameter.

I referred to limit switches Re: speed and a 50 ms delay.
Sorry I was not more clear.

On 02/03/2015 19:22, Spencer Chase lists@...
[mach1mach2cnc] wrote:
> aren't you supposed to approach the home switches slowly when homing?
> i thought homing went close and then did a slow back and forth to set
> the home accurately?

--
-hanermo (cnc designs)

--

Best regards, Spencer Chase
67550-Bell Springs Rd.
Garberville, CA 95542 Postal service only.
Laytonville, CA 95454 UPS only.
Spencer@...

(425) 791-0309

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All works fine and circles are now round :)

A video of it working is currently uploading.

Cheers,

Graham

-- 
-hanermo (cnc designs)

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?

Hi Spencer,

?

I’m not sure what you’re doing or trying to do is the best way to handle the situation and as you’ve been told you can’t turn offsets on or off, the machine ALWAYS have to move in one coordinate system or another so all you can do is switch between them. Anyway, since you seem determined to do it this way, here is what I think you are asking for.

?

If you want to be able to toggle between “any” offset and a fixed offset (I opted for offset 99) with a button you need to use a screen editor program to add a button (and a led if you want to see its status) to the screen. The button should be set to VB-script and the LED should be UserLED1234 (or any free number if you change the macro accordingly). You then attach the following macro to the button.

?

If GetUserLED(1234) = 0 Then??????? ' Offset is "off", now turn it on

?? SetUserLED(1234, 1)????????????? ' Turn LED on, used as an indicator AND semaphore

?? SetOEMDRO(46, GetUserDRO(1234))

Else??????????????????????????????? ' Offset is "on", turn "off"

?? SetUserLED(1234,0)

?? SetUserDRO(1234, GetOEMDRO(46))? ' Store current current offset number in user DRO.

?? SetOEMDRO(46,99)

End If

?

Basically what it does is switch between whatever offset you’ve activated and offset 99 (G59P99) so you need to make sure that the entry for offset 99 has all zeros in it.

?

If you don’t want to toggle it with a button but instead turn them “on” and “off” from within your G-code then split the macro in two and place the follwing in one M-code (M1201.m1s for example):

‘ Turn offset “on” macro

SetOEMDRO(46, GetUserDRO(1234))

?

And the following in another M-code (M1202.m1s for example)

?

‘ Turn offset “off” macro

SetUserDRO(1234, GetOEMDRO(46))? ' Store current current offset number in user DRO.

SetOEMDRO(46,99

?

Then you can call the macros from within your G-code program. Please note that I haven’t tested if this has any weird side effects so please be careful.

?

If you want to “nudge” the current position (ie the offset, not the actual machine position) of the Y-axis in the positive direction then add a VB-script button to the screen and attache the following code to it:

?

SetOEMDRO(801, GetOEMDRO(801) + 0.05)

?

?

To always put the machined program at the center of the stock even though the stock varies in “height” I’d simply use a self centering fixture instead of all this special stuff which is prone to mistakes and errors – especially when it’s not you yourself who will be operating the machine.

?

/Henrik.

?

?

---

-----Original message----?

i think i figured that out so what i need to do is to store either the current fixture choice and then restore it when i need to or to do it myself using the DRO and saving and entering the offset when the program is at a known starting position. this is what i need some VB script examples for.

On 3/1/2015 10:48 AM, Ger CNCWoodworker@... [mach1mach2cnc] wrote:

?

You can't turn them on or off. You either need to switch from one offset to another, or set them to zero when you want them to be "off".

Gerry

?

--

Best regards, Spencer Chase
67550-Bell Springs Rd.
Garberville, CA 95542 Postal service only.
Laytonville, CA 95454 UPS only.
Spencer@...

(425) 791-0309

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?

For a small wood router, I dont think so.
For home switches, or something truly accurate, or fast, yes.

An example, for illustration:

Running at 100 mm /sec, a 0.05 sec delay is 5 mm in movement.
6 m/min or 100 mm/sec is not always very fast, today.

Iirc probing, limits and spindle index are the critical ones, and run
under 0.5 ms delays in the ring zero layer.
(at 25.000 Hz, the lowest speed, max delay would be 0.4 ms, by my math).
Faster with hardware boards.

CSMIO runs at 4 Mhz, Pokeys at 25 kHz-125 kHz on motion engine, not sure
on internals.
cheers,
h-

On 02/03/2015 18:23, Spencer Chase lists@...
[mach1mach2cnc] wrote:
> i agree that if mach3 does software debouncing that a hardware
> solution is not necessary. the circuit i mentioned has a period of 50
> ms, i don't think that delay would cause a problem.

--
-hanermo (cnc designs)

--

Best regards, Spencer Chase
67550-Bell Springs Rd.
Garberville, CA 95542 Postal service only.
Laytonville, CA 95454 UPS only.
Spencer@...

(425) 791-0309

开云体育

Hi Spencer,

?

I’m not sure what you’re doing or trying to do is the best way to handle the situation and as you’ve been told you can’t turn offsets on or off, the machine ALWAYS have to move in one coordinate system or another so all you can do is switch between them. Anyway, since you seem determined to do it this way, here is what I think you are asking for.

?

If you want to be able to toggle between “any” offset and a fixed offset (I opted for offset 99) with a button you need to use a screen editor program to add a button (and a led if you want to see its status) to the screen. The button should be set to VB-script and the LED should be UserLED1234 (or any free number if you change the macro accordingly). You then attach the following macro to the button.

?

If GetUserLED(1234) = 0 Then??????? ' Offset is "off", now turn it on

?? SetUserLED(1234, 1)????????????? ' Turn LED on, used as an indicator AND semaphore

?? SetOEMDRO(46, GetUserDRO(1234))

Else??????????????????????????????? ' Offset is "on", turn "off"

?? SetUserLED(1234,0)

?? SetUserDRO(1234, GetOEMDRO(46))? ' Store current current offset number in user DRO.

?? SetOEMDRO(46,99)

End If

?

Basically what it does is switch between whatever offset you’ve activated and offset 99 (G59P99) so you need to make sure that the entry for offset 99 has all zeros in it.

?

If you don’t want to toggle it with a button but instead turn them “on” and “off” from within your G-code then split the macro in two and place the follwing in one M-code (M1201.m1s for example):

‘ Turn offset “on” macro

SetOEMDRO(46, GetUserDRO(1234))

?

And the following in another M-code (M1202.m1s for example)

?

‘ Turn offset “off” macro

SetUserDRO(1234, GetOEMDRO(46))? ' Store current current offset number in user DRO.

SetOEMDRO(46,99

?

Then you can call the macros from within your G-code program. Please note that I haven’t tested if this has any weird side effects so please be careful.

?

If you want to “nudge” the current position (ie the offset, not the actual machine position) of the Y-axis in the positive direction then add a VB-script button to the screen and attache the following code to it:

?

SetOEMDRO(801, GetOEMDRO(801) + 0.05)

?

?

To always put the machined program at the center of the stock even though the stock varies in “height” I’d simply use a self centering fixture instead of all this special stuff which is prone to mistakes and errors – especially when it’s not you yourself who will be operating the machine.

?

/Henrik.

--

Best regards, Spencer Chase
67550-Bell Springs Rd.
Garberville, CA 95542 Postal service only.
Laytonville, CA 95454 UPS only.
Spencer@...

(425) 791-0309

Hi,

I have a job to do some 3D machining in foam on my router, it's two-sided machining and unfortunately bigger than my machine.

I can't face having to mess around indexing the part in x so I thought I would add a simple moving bed to my moving gantry machine, when the gantry moves one way the bed moves the other. I've done this using an off the shelf ballscrew actuator and the 4-axis stepper driver that was doing nothing.

I set up the x-axis as a dummy axis so the DRO works but it does not output pulses and then in the formulas section did

A = x/2

B = x/2

Where A and B are set up to drive the gantry and bed respectively. This works with basic moves from the MDI:

However, when I did a test cut circles came out really funny. I'm assuming this is because the lead of the bed is twice that of the gantry and although they both have the correct pulses per mm set, in the middle of an interpolated move their differing resolutions mess things up.?

Can anyone confirm or give me some more insight into how the formulas do their thing? I'm thinking I can cheat the pulse/mm and modify the portion of x each axis moves to correct for this but I want to be sure before I make my brain hurt :)

Cheers,

Graham

开云体育

?

Hi Spencer,

?

I’m not sure what you’re doing or trying to do is the best way to handle the situation and as you’ve been told you can’t turn offsets on or off, the machine ALWAYS have to move in one coordinate system or another so all you can do is switch between them. Anyway, since you seem determined to do it this way, here is what I think you are asking for.

?

If you want to be able to toggle between “any” offset and a fixed offset (I opted for offset 99) with a button you need to use a screen editor program to add a button (and a led if you want to see its status) to the screen. The button should be set to VB-script and the LED should be UserLED1234 (or any free number if you change the macro accordingly). You then attach the following macro to the button.

?

If GetUserLED(1234) = 0 Then??????? ' Offset is "off", now turn it on

?? SetUserLED(1234, 1)????????????? ' Turn LED on, used as an indicator AND semaphore

?? SetOEMDRO(46, GetUserDRO(1234))

Else??????????????????????????????? ' Offset is "on", turn "off"

?? SetUserLED(1234,0)

?? SetUserDRO(1234, GetOEMDRO(46))? ' Store current current offset number in user DRO.

?? SetOEMDRO(46,99)

End If

?

Basically what it does is switch between whatever offset you’ve activated and offset 99 (G59P99) so you need to make sure that the entry for offset 99 has all zeros in it.

?

If you don’t want to toggle it with a button but instead turn them “on” and “off” from within your G-code then split the macro in two and place the follwing in one M-code (M1201.m1s for example):

‘ Turn offset “on” macro

SetOEMDRO(46, GetUserDRO(1234))

?

And the following in another M-code (M1202.m1s for example)

?

‘ Turn offset “off” macro

SetUserDRO(1234, GetOEMDRO(46))? ' Store current current offset number in user DRO.

SetOEMDRO(46,99

?

Then you can call the macros from within your G-code program. Please note that I haven’t tested if this has any weird side effects so please be careful.

?

If you want to “nudge” the current position (ie the offset, not the actual machine position) of the Y-axis in the positive direction then add a VB-script button to the screen and attache the following code to it:

?

SetOEMDRO(801, GetOEMDRO(801) + 0.05)

?

?

To always put the machined program at the center of the stock even though the stock varies in “height” I’d simply use a self centering fixture instead of all this special stuff which is prone to mistakes and errors – especially when it’s not you yourself who will be operating the machine.

?

/Henrik.

?

?

---

-----Original message----?

i think i figured that out so what i need to do is to store either the current fixture choice and then restore it when i need to or to do it myself using the DRO and saving and entering the offset when the program is at a known starting position. this is what i need some VB script examples for.

On 3/1/2015 10:48 AM, Ger CNCWoodworker@... [mach1mach2cnc] wrote:

?

You can't turn them on or off. You either need to switch from one offset to another, or set them to zero when you want them to be "off".

Gerry

?

--

Best regards, Spencer Chase
67550-Bell Springs Rd.
Garberville, CA 95542 Postal service only.
Laytonville, CA 95454 UPS only.
Spencer@...

(425) 791-0309

开云体育

?

I think I would stay far away from this type of solution. These chips are designed to debounce human activated switches. They will introduce a delay that could be significant; they are another point of failure of your safety switches; and in the end do nothing more than Mach3 is already doing when you set the delay greater than zero.

As Hannu wrote, the only safe, long term fix for this problem is to eliminate the noise and/or replace defective switches.

Graham

---In mach1mach2cnc@..., wrote :

i just bought some of these debounce chips for another application but have not tried one yet. even thought they are tiny surface mount, they have just power and in and out switch connections so they should be easy to solder into anything. if the false switch closures are caused by electrical noise, i am not sure these would fix it but they should work for pretty much any switch contact debouncing. i am using hall effect limit/home switches on my machine which i should replace with mechanical switches some day because the hall effect ones are too touchy. when i do, i will use debounce circuits.

On 3/1/2015 2:11 AM, Hannu Venermo gcode.fi@... [mach1mach2cnc] wrote:

?

The debounce should be set at 0, imo, ime.

If you get false triggers, the better solution is to fix the electrical
noise thats causing this.
Shielded cables ?
Grounded at one end only ?
Proper switches ?

-- 

Best regards, Spencer Chase
67550-Bell Springs Rd.
Garberville, CA 95542 Postal service only.
Laytonville, CA 95454 UPS only.
Spencer@...

(425) 791-0309

开云体育

To always put the machined program at the center of the stock even though the stock varies in height Id simply use a self centering fixture instead of all this special stuff which is prone to mistakes and errors especially when its not you yourself who will be operating the machine.

/Henrik.

_,___

-- 


-hanermo (cnc designs)

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