Hi
I am having trouble a Z feed does not get to zero before the next command starts to move and  it seems to be feed dependant
G0 Z .25
G1 Z0  F55
X2.2 F100
this will start feeding the Z value until about .020" .030" before Z reaches zero then the X moves begins leaving a  .150  to .200 long ramp
If I slow the Z feed down to say just 4  it seems to feed all the way down  then do the X move
Do I have some thing set wrong some where
Regards Ray Hudson

This can be caused if you are running in Constant Velocity mode using G64. This causes the control to blend moves, and that is bad for drill cycles.

Try inserting an Exact Stop mode command, G61 before the drill cycle.

I use mastercam  and I looked through and  it is putting a G64 at the start of the code
Thanks I will test a G61 out tomorrow  but am pretty sure you have the problem solved thank you very much
I think in the past in high feed  moves I was getting larger radius on internal radius machining but could never figure it out so I think that will be the same  problem   
Regards Ray and thank again

I have tried the G61 and it cures one problem but  it is so jerky doing compound curves etc that I can't use it
Also doing hi speed cut outs with G64 it cuts external 90 degree corners fine but internal corners 90 degree corners it puts  a large radius instead of a sharp 90 degree corner and this radius is related to the speed of the feed  so to my mind is not following the tools path  and I think it is impractical to put a G61 before every internal corner and a g64 after and don't think the post processor could figure out to do that either 
So I am at a bit of a loss how to tackle the problem
I am using a router and feed of 120 inch per minute and need to get down to say 6 IPM to make is follow the desired tool path
Regards Ray

It sounds like you acceleration is too slow. Try increasing it a little at a time. You may also want to look at the CV wizard.

Mike

I did not know about the CV wizard and will have a good play  I have not found any real explanation of how it works and what angle 1  angle 2 etc should be set to   and what is means  but I will set  up a test piece and test it out as best I can   the docs that came will mach4  on CV do not seem to be what I have for CV wizard
Mine had angle 1 set to 179 and the rest to zero
Regards Ray

Run the CV distance tolerance wizard and read each screen............ the documentation is built in.

Hi
I open the wizard there is CV_feedrate there do not seem to be any help screens there but I can alter the angle0=179 to what ever I want
there is also the mctuningwizard this I can move the sliders up and down but can't save or in fact get out of it with out doing a Alt Cntr Del  it seems to lock up I also cannot read the bottom text in the screen or scroll it up
This is on my home computer in demo mode I will try on the machine tomorrow
regards Ray

Don't overlook the possibility of dynamically switching between G61 and G64 as needed so that drills can be exact and regular moves get smoothed out.

Good point Steve and it may be exactly what he needs to do.

If you do not have mcCvDistToleranceV001 in your wizard list you probably need to update.