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Author Topic: X0Y0 Jumping?  (Read 6595 times)

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Offline RICH

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Re: X0Y0 Jumping?
« Reply #10 on: February 17, 2010, 04:24:27 PM »
I am guessing you are missing a step when it is done with the letter R and then going to the letter C.
Don't know if it is in the rapid move .....
Additionaly you see the little .008" out of wack engraved portion  in #2. It is very small and at first i thought it may be the fine point of the tool deflecting sum, but , don't think so.

Are your motors getting rather hot?

I would try still try slowing down the velcocity and acceleration. Heck, try it at crawl speed.
The rest of the lettering looks good so i don't think it's mechanical ( backlash, etc ).

I always use constant velocity for my engraving work. My engraving machine also runs very slow and is extremely reliable. So even though it can run at around 10 inches per min i use it at 3 or 4.

RICH

Offline RICH

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Re: X0Y0 Jumping?
« Reply #11 on: February 17, 2010, 04:28:38 PM »
Alton,
Got to go and will check back later tonight on what you think.
RICH
Re: X0Y0 Jumping?
« Reply #12 on: February 17, 2010, 04:43:47 PM »
A good check to see if you are missing steps is to run the VERIFY routine.
If you have limits of course.

This function verifies the positions of all axes by performing a home operation on all axes simultaneously,
then moving all axes to position 0.0000 of the current fixture. If Safe_Z is enabled, a move to Safe_Z will
be performed first. If the Silent argument is True, then upon completion, a message is displayed on the
status line showing the offset errors of all axes from their home position. This function I used to ensure
that no position loss has occurred, and/or to correct any position loss that may have occurred since the
previous home or verify operation.

Russ
Re: X0Y0 Jumping?
« Reply #13 on: February 17, 2010, 06:03:31 PM »
So... I figured I put this VERIFY button on my lathe screen and use it instead of the way I previously checked for missed steps.
Looks like it won't work if the home switches are in series to one pin as all axis's home simultaneously and the first axis to reach its switch is the only one verified.
The other axis acts as though it hit its switch then reverses as well showing a discrepancy.
You can work around it by jogging one axis closer to its switch than the other axis, verify that axis, then jog the other axis closer to its switch to assure it homing first, then verify that axis.
So, back to the other way.
Home the machine as normal with Auto Zero checked.
Run the code several times.
UNcheck Auto Zero and re home the machine.
Machine coords dros will show any steps missed.
You can use this also to check consistency/repeatability of the switch itself. Mine fluctuate around .0002"
Heck, you probably don't even have home switches do ya.
Russ

Offline RICH

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Re: X0Y0 Jumping?
« Reply #14 on: February 17, 2010, 08:51:30 PM »
Russ,
Good post.Never used the VERIFY and documentation is about nill in the manuals.
Nope don't have any of those switches yet......someday...... i guess. I need about 20 of them.  ;)

RICH

Offline cuecaps

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Program itself?
« Reply #15 on: February 22, 2010, 12:52:23 PM »
I've been trying 2 other g code engravings.
They both work O.K.
I re-did the faulty "Abalone" program in LazyCAM and re-posted to Mach 3.
It did the same thing on the 5th cycle of the g-code.
I am going to re d0 it in LazyCAM and try once more.

Also, I notice , when I re-uploaded Mach3 and LazyCAM, I don't have all the fonts I had originally.
Why would LazyCAM have missing Font styles?
How can I get them Back, Like Mono Corsiva?

Offline cuecaps

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Mystery: Technical or Spiritual
« Reply #16 on: February 23, 2010, 11:13:48 AM »
I  re-did the whole Layout in LazyCAM and made 3 seperate g-code .tap files.
 One for the HERCERK, one for the 1st and one for the ABALONE.
Then, ran it all seperatly .
And, I didn't go that deep (Z axis).

Finally it didn't "Jump"..
But, It's little off-center.
Or, that, as the machine engraves, the fonts get bigger as they move to the right end fonts.
The font is slightly larger, thereby, increasing the space between the top of the Font and the border.
It happen before.
 I have another  Cap completed, with the  engraving that shows that "Effect".
Thanks for your time Guys..
I don't know if the problem will occur again.
Alton