Author Topic: Touch off  (Read 8163 times)

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Offline kcib

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Re: Touch off
« Reply #10 on: September 12, 2010, 06:12:13 PM »
Hi Dave
have just downloaded and installed latest MSM , there still seems to be a problem trying to touch off using the master tool , the message ( "Can't set Z0 in master mode w/o master tool" ) has now gone but when I click on the arrow Set Z Zero nothing happens so not sure if you have tried to fix this bug or not ,
Thanks
Alan 

Offline DaveCVI

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Re: Touch off
« Reply #11 on: September 12, 2010, 08:33:14 PM »
Alan,

... when I click on the arrow Set Z Zero nothing happens ....

That's not what I'm seeing - Let's walk thru an example to see where what you see differs from what I'm experiencing.

The example I'll construct can be done in sim mode - that way I don't have to worry about imperial / metric units or what the working envelope of your machine is.

1) fire up mach 3.43.22 with MSM 0.3.14 (Beta 10), get it ready (out of estop)
go to the reference page - the MSM Verizon shown is "Version 0.3.13 (Beta 10)" - correct?
Menu - help - about - mach version = "Version R3.043.022" - correct?

set up the gage block height
2) go to settings-common page.
3) set Gage/Plate Height DRO = 0.5

set up the MT params
3) I'll use T251 as the MT number for this example
4) go to the Tooling page
5)  master Tool Mode options panel:
    set this option combination:
        TC Auto TCP OFF
        Master T Mode ON
        TC Auto TLO OFF
        RH T-Holders OFF
        Master Tool #: DRO = 251
        Master PTL: 2.0

we'll get the MT mounted (so mach knows it has the MT as the current tool)
6) via MDI: T251M6
7) complete the tool change (don't actually physically mount the MT in the spindle - we will fake a Z touch off rather than actually touching the MT to a surface, no tool mounted gives us the most clearance possible while testing)
8 ) now we have T251 (The MT) mounted - which is the MT
9) Current T# DRO = 251 correct?
10) the TLO for the MT in MT mode is always = 0
The TL Offset DRO value should = +0.0    Correct?

we will set up for a touch operation in MT mode:
11) go to WC offset touch page
12) big Green MasterT Mode LED is on - correct?
13) via MDI: G53 G90 G0 X0 Y0 Z0
14) zero X, Y & Z - ok , now we have MC=WC=0 for X,Y,Z - all DROs for X,Y,Z in the offset panel should be 0
15) MDI: G53 G90 G1 F5 Z-1
16) Z row of offset panel should be:
-1.0 = -1.0 - +0.0 - +0.0 - +0.0

We are set up to do the "Set Z Zero" operation
we have:
    MCZAxis position = -1.0
    ZWCOffset = 0.0
    GBH = 0.5

The offset calculation for button in MT mode is:
WCOzOffset = MCZAxisPos - ZWCOffset - G-Blockheight
                   =     -1.0         -    0.0         -       0.5
                   =  -1.5

17) click Set Z Zero
18) Z row of offset panel will change and it should now be:
+0.5 = -1.0  -  -1.5  -  +0.0  -  +0.0

Dave

Author of the MachStdMill Extensions for Mach3
www.CalypsoVentures.com

Offline kcib

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Re: Touch off
« Reply #12 on: September 13, 2010, 07:00:25 AM »
Hi Dave
Yes I am the plonker was not doing it quite correctly , I was expecting the that after pressing the Set Z Zero arrow  that the "Z" axis would move down to touch the touch plate , so to get this right I assume that I manually move the "Z" axis down to touch onto the touch plate and then click onto the Set Z Zero arrow ??
Thanks
Alan

Offline DaveCVI

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Re: Touch off
« Reply #13 on: September 13, 2010, 09:53:04 AM »
Alan,
OK, I see where the mis-communication was -
The touch page is for "touching". I.e. manually touch the tool to the surface then click the button.

The probing page is for moving the tool to a surface, and finding it via a touch plate or probe event into Mach.

ON the probing page "Probe Z-" will move the current tool down until a probe event tells mach that the tool has touched the surface (in this case the signal caused by the tool touching the touch plate).
If you are in MT mode, then the same calculation I described before is done when the TP is touched.

1) make sure you have set the height of the TP (settings page) to the thickness of your TP (or the calculation result will be off)
2) make sure the TP is working each time (I life the TP up and touch the tool to see the screen LED go on)
3) make sure the TP is under the tool when you click "probe Z-" (it's not fun to miss the plate)

Dave


Author of the MachStdMill Extensions for Mach3
www.CalypsoVentures.com