set up for hot wire foam cutting please

[lazy mark]

hi all new to forum i have just built a hot wire foam cutter but am having trouble with some of the settings
i have a  TB6560 4 axis  controller board nema 23's all axis work fine with jog  but cant get them to go to home 3 do but not the 4th axis

also i have 3 imputs for home switches and 1 e/stop as i need 4 home switches not sure if to wire all to external 9 pin and allocate the pin in the software homing and limits

many thanks all i will post pics and info so it may help others

till i speak again lol lazy mark

[Hood]

You can connect all home/limit switches in series if they are normally closed and thus only use one input.
Hood

[lazy mark]

cheers my friend is that because they go to home at different times ie touch home then come back off the switch so the next one
can find home  i am not sure how it works lol 

many thanks for your help

[Hood]

Yes thats correct, it is possible to home all axis or a combination of axis at the same time if you wish but for that you need to have seperate inputs for the home switches for each axis you are wishing to home with another.
Hood

[lazy mark]

hi hood many thanks for the info i have a problem wiring the home switches cannot get a signal on mach3

i have wired to the 9 pin PC plug could it be i have not sorted the right pins

e/stop works OK

now you know i am just starting when you have an active high is that a say positive and the active like a negative

just the setup for home switches and software for them and motors are a bit noisy

just thought anybody know where i can get some Teflon split bushes to fit 20mm bars and clip into a aluminium
carriage 3mm thick they look like grommets

many thanks for your time lazy mark   (i have a laser cutter)

[lazy mark]

hi there i have set up  my cnc foam cutter but i draw a shape in my dwg package but when i import
gcode from foam works mach3 gives me a completley different shape on the cutting screen

any ideas
many thanks mark

[Hood]

If its arcs that are weird then could be your IJ mode. That should ideally be set in the preamble of your code but it can also be set to default in General Config page.
Hood

[lazy mark]

hi hood thanks for info on home switches works good now

right i new to this and have not got a clue what your saying lol sorry
i have drawn a basic wing dxf import to foam works save as gcode now when i import to mach3 i just get i line shaped like a spiral

so close but so far i have worked most things but this has stumped me i dont know if i have mixed up the axis abnormal condition keeps flashing


cheers mark

[Hood]

Can you attach the code and I will see what it looks like here.
Hood

[lazy mark]

hi hood sorry about that other pc not on line



T1
G17 G49 G54 G80 G90 G94 G21 G40
F200
G01 X0.000000 Y100.000000 U0.000000 V100.000000
G01 X-200.000000 Y100.000000 U-200.000000 V100.000000
G01 X-200.000000 U-200.000000
G01 X-201.414037 Y99.980001 U-201.414037 V99.980001
G01 X-202.826942 Y99.920020 U-202.826942 V99.920020
G01 X-204.237587 Y99.820105 U-204.237587 V99.820105
G01 X-205.644841 Y99.680336 U-205.644841 V99.680336
G01 X-207.047579 Y99.500824 U-207.047579 V99.500824
G01 X-208.444680 Y99.281714 U-208.444680 V99.281714
G01 X-209.835026 Y99.023181 U-209.835026 V99.023181
G01 X-211.217504 Y98.725431 U-211.217504 V98.725431
G01 X-212.591008 Y98.388702 U-212.591008 V98.388702
G01 X-213.954440 Y98.013265 U-213.954440 V98.013265
G01 X-215.306709 Y97.599419 U-215.306709 V97.599419
G01 X-216.646733 Y97.147495 U-216.646733 V97.147495
G01 X-217.973440 Y96.657855 U-217.973440 V96.657855
G01 X-219.285770 Y96.130891 U-219.285770 V96.130891
G01 X-220.582672 Y95.567024 U-220.582672 V95.567024
G01 X-221.863108 Y94.966705 U-221.863108 V94.966705
G01 X-223.126054 Y94.330414 U-223.126054 V94.330414
G01 X-224.370501 Y93.658661 U-224.370501 V93.658661