I just had Cad++ installed and I am having problems when I probe a hole and my probe retracts past the center of the hole and hits the back of the hole which inturn retracts and hits the front of the hole and goes into a loop of back and forth hits. I went to F10 then to motion and changed my prehit and retract distance but it did not help at all. Could a setting changed when Cad++ was installed? If so how do I fix it?
If I had a .125 dia hole and used a 2mm probe should the probe retract to the center of the hole?
Do some quick math. The hole is .125 diameter. So the radius is 0.625. Your tip is .0788 diameter.
1). An ID doesn't even need any retract. Yeah, ya need to put "something" in there. So put 0.01".
2). If you use 0.02" retract, the opposite side of the tip will be almost touching the other side of the hole.
You'll be about 0.026" from touching the opposite side of the hole . . . ASSUMING the hole is in perfect
location (BP NOM) and perfectly Normal orientation.
You only have 0.046" clearance, total, to work with.
Assuming you can't use a smaller tip (1.5mm or even a 1mm) . . . if you need to use a 2mm tip,
you need to "find" the actual hole before you measure it.
Measure a point on the surface near the hole opening. Establish Origin to that point. Which ever axis
is perpendiculat to the hole. As in, if the hole is going straight down (Z), set Z to 0.000". (At the pierce
point of the hole)
Set prehit to 0.025", & retract to 0.015"
Make a MOVE to where the center of the hole should be in X & Y, and +0.03" or so in Z. Like: X=1.256"
Y = 4.380", Z = +0.03". (Blue Print coordinates for X & Y. Z will be just a little above pierce point.)
Measure the hole at the NOM X & Y, at Z = -.015. So what you're doing is measuring the hole
with just a part of the tip. So it's contact diameter with the hole is more like 0.03", not the full 0.0788".
Establish Origin in X & Y at that "find" diameter.
MOVE to X0, Y0 Z-0.15.
Measure the hole again at X0 Y0 Z ? How ever deep you need to go.
Use maybe 0.015 prehit and retract.
Your probe will be moving within the REAL hole, not where it's supposed to be.
MOVE to X0 Y0 Z+0.1.
Recall the previous alignment. (The alignment used before you started this)
Continue on.
I don't get on here very often. Any questions, you're welcome to contact me directly.
If I had a .125 dia hole and used a 2mm probe should the probe retract to the center of the hole?
Do some quick math. The hole is .125 diameter. So the radius is 0.625. Your tip is .0788 diameter.
1). An ID doesn't even need any retract. Yeah, ya need to put "something" in there. So put 0.01".
2). If you use 0.02" retract, the opposite side of the tip will be almost touching the other side of the hole.
You'll be about 0.026" from touching the opposite side of the hole . . . ASSUMING the hole is in perfect
location (BP NOM) and perfectly Normal orientation.
You only have 0.046" clearance, total, to work with.
Assuming you can't use a smaller tip (1.5mm or even a 1mm) . . . if you need to use a 2mm tip,
you need to "find" the actual hole before you measure it.
Measure a point on the surface near the hole opening. Establish Origin to that point. Which ever axis
is perpendiculat to the hole. As in, if the hole is going straight down (Z), set Z to 0.000". (At the pierce
point of the hole)
Set prehit to 0.025", & retract to 0.015"
Make a MOVE to where the center of the hole should be in X & Y, and +0.03" or so in Z. Like: X=1.256"
Y = 4.380", Z = +0.03". (Blue Print coordinates for X & Y. Z will be just a little above pierce point.)
Measure the hole at the NOM X & Y, at Z = -.015. So what you're doing is measuring the hole
with just a part of the tip. So it's contact diameter with the hole is more like 0.03", not the full 0.0788".
Establish Origin in X & Y at that "find" diameter.
MOVE to X0, Y0 Z-0.15.
Measure the hole again at X0 Y0 Z ? How ever deep you need to go.
Use maybe 0.015 prehit and retract.
Your probe will be moving within the REAL hole, not where it's supposed to be.
MOVE to X0 Y0 Z+0.1.
Recall the previous alignment. (The alignment used before you started this)
Continue on.
I don't get on here very often. Any questions, you're welcome to contact me directly.
