Homing & Auto Tool setter

breezy

Arie
Staff member
Trying to setup auto tool setter, followed instructions here. Tested input - confirmed input changing on tool contact. Completed Auto Tool Setter dialog box with location values and enabled checkboxes.

Tried tool change command in MIDI no response, so tried homing expecting tool length check after homed, but machine homed and sat there and screen indicated it was still homing please wait.

Had to stop machine via program stop button but then it indicated that homing had failed.

So disabled auto tool setter and continued working on test program.

Regards,

Arie.

For the Bicton Men's Shed.
 

breezy

Arie
Staff member
Tool setter input is low going high on contact with tool.

Yes have watched video some time ago, will re-watch when I find time before next Monday.
 

masso-support

MASSO Support
Staff member
Hi Arie,

Came across this exact issue when setting up my machine in the weekend and found it was because my X axis was outside the limit area once my machine was homed.

The machine will first Home its X, Y & Z axis then will do a tool length check but if any of the Axis are outside the limit area the machine will just sit there flashing the homing light until it fails, even if the location for the tool test is inside the limit area as mine is.

Assuming this it the MensShed machine then we can be pretty sure that this is your issue since it homes outside the limit area.

Cheers

Peter
 

breezy

Arie
Staff member
Quote from MASSO Support on April 1, 2019, 7:52 am

Assuming this it the MensShed machine then we can be pretty sure that this is your issue since it homes outside the limit area.

Cheers

Peter

Peter,

Can you explain this better, I'm have difficulty understanding how our machine homes outside the limit area.

As it is now the machine travels to the back right corner hits the limit switches and backs off 2mm. I have the home position set as X1100 & Y1075. The max travel in the axis setup dialogs are set to the same values, which should set the axis soft limits to the backoff point.

When I enter X0Y0 in MIDI the machine travels to left front corner exactly X = 1100 & Y=1075 from the back off point. So to me the backoff point is the positive limits of the machine.

If I was to home the machine to front left corner and set the home position to X0Y0, then I move the machine randomly from the backoff point and then command X0Y0 it will travel to the backoff point not to the limit switches.

I've got the Auto Tool probe situated at about X1090Y10 (not sure of exact figures entered into Auto Tool dialog) which is inside the soft limits.

Ahhh I think the lightbulb has come on! I need to set the max travel in the axis dialog to a couple mm larger than the home position values so that after homing the machine is inside its soft limits. Is this correct? If so I will adjust the setting on Monday and test.

Regards,

Arie.
 

masso-support

MASSO Support
Staff member
You are onto it Arie,

Your home position is X1103 Y1075 but your travel is X1100 Y1070 so as soon as the machine homes it is now outside the allowed travel.

Make your travel on the X & Y equal too or a little larger and the homing routine will proceed as it should.

Cheers

Peter
 

breezy

Arie
Staff member
FIXED

Updated the X & Y axis travel settings to remove soft limit alarms.

See this post

Regards,

Arie.

For the Bicton Men's Shed.
 

testyourdesign

testyourdesign
@masso-support

I picked up a metrol tool setter P11DDB-DULD for my mill. It has a built in LED in line with the switch. The wiring diagram for the Auto Tool Length sensor in the Masso Documentation does not appear to be the right one for my application. Can I simply connect one wire from the tool setter to the +ve output on the Masso Power Supply and the other to one of the Masso input pins to make it work or do I need to add a resistor?

Thanks, Stephen Brown
 

testyourdesign

testyourdesign
@masso-support

Yes the LED's was my concern. The example wiring diagram for the automatic-tool-zero in the Masso document only shows one connection to the touch sensor but my touch sensor has 2 wires. Does the other wire connect to the -ve terminal on the Masso power supply?
 

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jolbas

Jolbas
It should be better to just connect it between +ve and input. No extra resistors should be needed. If you have 24V then Massos internal 6.7k resistor will limit the current to 2mA and the LED should handle that but it may not lit.
 

masso-support

MASSO Support
Staff member
Hi Stephen

Had a look at the spec sheet for the tool setter and it isn't really clear. As I read it the switch is normally closed and should open when the tool depresses it. It also says a maximum of 5mA is permitted for the LED. I got out my multimeter and measured the current that flowed when it was placed between the positive of the power supply and my input and the result was 2ma. I'm using a 12 volt supply and at 24 volts it should be about 4mA. I then got out an LED and put it between the +ve and the input and the LED lit dimly and the input changed to high so in theory if you put the red wire of your touch off from the +ve and the white wire to the input then invert the input because the switch is normally closed it should work. The LED should light and when the button is depressed the led should turn off and the input should change from low to high. The 5.6K resistor is not needed for this setup.

That's the theory assuming I am right about the switch being normally closed but I have one major concern. Is the touch off unit insulated from the connectors because if it isn't it won't work. Get out a multimeter and test each of the 2 wires and make sure there is no continuity between them and the body of the tool setter and the button that the tool presses. Make sure you press the button all the way down while testing. If there is continuity and you connect the setter to +ve then rest it on a grounded mill or press the button with a grounded cutter you will short out your power supply. It's probably fully insulated and I'm worrying about nothing but it is best not to assume. If you find one of the wires had continuity to the body or button we will need to review how to connect it.

Also while you have the meter out you can put it between the Red and White wires and check it if it a normally open or closed switch. The LED will probably not light and you may have to change the polarity of your meter to get a reading. You won't get a 0 ohm reading because of the LED but you should be able to identify the switch as either normally open or closed. If it is NO then don't invert the input and the LED will light when the button is pressed. If it is NC the LED will turn off when the button is pressed and the input will need to be inverted.

Set your meter to current ,mA range, and for peace of mind measure the current flow between +ve and the input you will be using. The reading will be the maximum current that can flow and if it is below 5mA it is safe for your tool setter.

That's how I would do it. Hope this helps

Cheers

Peter
 
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