Messages

111

General Mach Discussion / Re: Some starting advice for two steppers on one axis

« on: March 03, 2016, 04:33:39 AM »

OK - I think I see where the confusion started here.

In your original post you started off saying:

I need someone to point me in the right direction for controlling two stepper motors on one axis and keeping them in sync.

So far so good - this is the way you need to go (as I've been saying) - you've been given the answer already - slaving.

But then for some reason which I don't understand - you said:

I am building 2 XY tables that will be separated and I need them to work in sync.

112

General Mach Discussion / Re: Can’t get Probe to Work

« on: March 03, 2016, 04:07:56 AM »

I can't see the point - 121 should pull up to around 4.8V and you're unable to read that so I'm lost I'm afraid. Also the 120 Ohms is already going to pull around 40mA when the pin is grounded.

I'm afraid I'm going to have to give up Kolias.

TBH though - I'd consider binning that BOB. The design IMO is complete crap. The way they suggest implementing tool touchoff on page 11/14 says it all for me.

113

General Mach Discussion / Re: Some starting advice for two steppers on one axis

« on: March 03, 2016, 03:32:53 AM »

I'll try once more - a STANDARD XYZ gantry machine supports AND drives the gantry at BOTH ends. Try googling "gantry router pictures".

114

General Mach Discussion / Re: Can’t get Probe to Work

« on: March 02, 2016, 01:53:59 PM »

so that's all good. The only thing not panning out is the pullUP resistor.

Please switch your meter to resistance and check that resistor.

gotta go (again)

115

General Mach Discussion / Re: Can’t get Probe to Work

« on: March 02, 2016, 12:49:05 PM »

first one is madness - second one sounds right.

re: your colour bands - those colours aren't correct for 120 but leave that for now...

OK - gotta go now - but you could try this just to establish the pin is working:

1) remove the resistor and the red and black wires completely.
2) with pin 15 set to active low - you should see the digitize LED on the diagnostics page lit.
3) Now change active low to active high (red cross) - you should now see the LED UN-lit.
4) now connect a wire directly between 5V and pin15. You should see the LED lit again.

116

General Mach Discussion / Re: Can’t get Probe to Work

« on: March 02, 2016, 11:47:22 AM »

between pin 15 and GND I get 0.55.

Then pin15 is STILL being pulled to GROUND by the internal pull DOWN. This should NOT be happening because the 120 ohm resistor between pin15 and 5V should be stronger and thus pull UP to around 4.8V.

You effectively have pin15 at the centre tap of a potential divider of 120/4K7. That just HAS to give a reading of 4.8V between 15 and GROUND. If it doesn't then either the manual is wrong, your board is screwed, or physics doesn't apply in your neck of the woods.

The only thing I can suggest as a last try is to connect the resistor DIRECTLY between 5V and pin15 and then measure between GROUND and pin15.

In fact - while you're at it - can you also check the voltage between the 5V screw and GROUND screw?

Also - are you absolutely sure that resistor is 120 ohms?

117

General Mach Discussion / Re: Can’t get Probe to Work

« on: March 02, 2016, 11:32:08 AM »

The clip is a small alligator clip and can only clip it to the head of a screw around the router mounting bracket.

Jeeze Kolias - you could have mentioned this before.

118

General Mach Discussion / Re: Can’t get Probe to Work

« on: March 02, 2016, 11:15:47 AM »

Setting my voltmeter at 20VDC scale I get 0.65 between the tool bracket and the touch plate. I get Nothing between the tool chuck and the touch plate

I've just re-read this. Remember what I said earlier about doing what I asked and not what you fancied?

Where did I say test between the tool BRACKET and touch plate? Then WHERE did I say test between the tool CHUCK and the touch plate?

You've (hopefully) clipped the clip to the TOOL - yes? - so test between the TOOL and the touch plate please.

Then please test between the actual screw on input15 and the actual screw on the power connector GROUND.

119

General Mach Discussion / Re: Can’t get Probe to Work

« on: March 02, 2016, 10:52:01 AM »

I can just make out a resistor connected at one end topin 15. What is the other end connected to?

120

General Mach Discussion / Re: Can’t get Probe to Work

« on: March 02, 2016, 10:30:10 AM »

OK - clearly SOMETHING is not correct - this SHOULD be dead simple.
Can you do a good clear photo capturing your WHOLE BOB showing the resistor and your wiring please?