Annoying twitch

[matt_raymond60]

When my ShopBot first drops into the material to start a cut created in ArtCam it makes a little jog and then begins the cut. Unfortunately it jogs into the piece instead of away from it so I end up with a a very small (1/8" or so) notch in the corner of the workpiece. All the rest of the cut is perfect. Obviously this is not always going to be something that I can hide. I don't seem to have any play in the machine and it doesn't do this when I use Partworks. Can anyone help me figure out why it is doing this?

[Gary Campbell]

Matt...
Does the little jog happen just before or as the machine begins to move in the X,Y direction?

There are only a couple things that will cause this. One is a long or flexible bit coupled with a plunge speed that is too fast. The other is play in the machine. Please understand that the majority of people with play in the machine dont think there is play, or they woud have fixed it already.

I am not sure why this would happen in artcam and not PartWorks if the plunge speed for the bit is set the same. If you can post the file or your move and plunge speeds it might be easier to diagnose.

[billp]

OR if you HAVE to use Artcam for the job, create a " lead in" ( more than 1/8"outside) tool path so your plunge occurs outside of your tool path and THEN enters the desired cut path. Yes it's a workaround rather than a fix, but in the end it will get the job done until you CAN find the solution....

[matt_raymond60]

It plunges down in the workpiece, then makes the little twitch which ends up where it started, then starts cutting in the x and y axis. It is a very definite quick little jog when it does it.

[bleeth]

A couple of specific questions:
1. What version of AC do you have?
2. Have you sent a sample file to your reseller?
3. Post or send the SB file (as GC asked).

[Gary Campbell]

Matt...
That would have been my guess.

What model machine are you using?
What is your bit & plunge speed(s) if different between AC & PW
How long since you have tightened pinion/rack & adjusted V rollers on the X, Y and Z?
How about spindle or router mounting bolts?