Topics

1

General Mach Discussion / A question about homing

« on: January 09, 2020, 01:59:10 PM »

When mach 3 homes an axis , it'll move  until it tripps the switch . 
And then it 'll back off until it trips again or untrips and calls that position home .


Is it possible to make mach3 back off a little further off the home switch .
Something like 0.5mm . 

I have installed magnetic switches and they work absolutely perfect .
But they're so sensitive that sometimes with the axis just backed off enough to untrip
the switch , it'll triiger it again after it's homed .
Fi assume the z axis homed , then it'll start homing on the Y axis .
Sometimes the movement of the homing Y axis will trip the Z axis switch again wich then acts as a
limit causing an E-stop . Backing off a little further would solve that

pat

2

General Mach Discussion / Metric on an imperial machine , setting up question

« on: January 13, 2018, 10:55:27 AM »

Hello , a quick question .

I'm used to and would like to continue working in metric . So if I understand the manual correctly
I have to set the native units to mm .

My machine however  has  16tpi lead screws , coupled directly to the
steppers . Steppers are rotating nuts so I'm stuck with the 16 tpi and cannot change that . .

Setting to mm would mean I have 25.4/16 = 1.5875mm/rev .

Let's assume a 1/16 ustep driver and my steppers are std 200steps/rev .
That results in 2015.748031496063........ steps/unit .
Other ustep setting produce similar "impossible" figures .

I can't seem to find any setting of the ustep driver wich would produce an integer nr of steps / mm .


Not sure what to do here , suggestions appreciated .


Thx
Pat ( Belgium )

3

General Mach Discussion / Looking for a 3 phase stepper dirver

« on: May 16, 2007, 02:45:33 AM »

Guys , I've got this nice set of stepping motors , wich i'd like to use on my mill .
The mill is an 1972 alcera 600 , wich will be fully rebuild prior to cnc converting .

Only they are three phase bipolar instead of the usual two phase bipolar .
I just can't seem to find an integrated driver for them . I'm not looking for a driver board .
I just need to find a chip that can do the logic , and possably micro stepping .
A bit like an L297 for a bipolar 2 phase motor .

On the back of the motor is written :
Sanyo electric stepping motor
Type 103-606-i
3phases /10 Ohms / 30VDC
PN 18460782


Any help appreciated .