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I'm having problems with when ever I do a cut the cutter doesn't get to the DOC before it starts jogging so I have a step where I plunge in. At first I was thinking it feedrate setups I've messed some with it but I'm not seeing any improvements.
This is happening on everything I cut and I've used cut 2d and v-carve pro with the same results.
Do I have a machine setup problem? Mach3 configuration? My Z axis lead screw?
Machine is a CRP 4x4 with nema 23's R&P, K2 Z axis with .1 pitch (I plan to upgrade for faster rapids) currently my X & Y rapids are set to 400 and the Z is 200.
My CRP 48 x 48 build [URL="http://www.cnczone.com/forums/open_source_cnc_machine_designs/144173-crp_4x4.html"] CRP 4x4[/URL]
I set my X, Y, and Z for the same feedrate, use 15 to 20 ipm for plunge rate with flat nose router bits, and 30 ipm for V-bits. Haven't had this problem so far. One of the more experienced guys here may recommend something different, but it depends a lot on the cutter type you are using.
CarveOne
http://www.carveonecncwoodcraft.com
I've seen it with single and 2 flute cutters both in 1/8 and 1/4 sizes Have not done any V bits lately.
I'll try setting all my axis to the same and try lowering my plunge rates.
My CRP 48 x 48 build [URL="http://www.cnczone.com/forums/open_source_cnc_machine_designs/144173-crp_4x4.html"] CRP 4x4[/URL]
Increase the Z axis acceleration.
What are all your axis accels set to?
Gerry
Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
I'll have to check and get back to ya.Originally Posted by ger21
My CRP 48 x 48 build [URL="http://www.cnczone.com/forums/open_source_cnc_machine_designs/144173-crp_4x4.html"] CRP 4x4[/URL]
unless you have a x or y move on the same g1 line as a Z, it will complete the Z plunge before moving x or y.
Maybe what you are seeing is backlash in the Z. while plunging, the backlash is taken out by the axis being forced up, and when the x or y moves, the Z ramps down? I would expect this to be a ramp though, and not a step like you describe. just a thought.
It seems to be about the last 20% of the DOC that it doesn't plunge down to right away. So I'd say its not backlash/ hope
My CRP 48 x 48 build [URL="http://www.cnczone.com/forums/open_source_cnc_machine_designs/144173-crp_4x4.html"] CRP 4x4[/URL]
Have you checked your the clearance and plunge distances in VcarvePro?
Chris
Hi,
I had a similar problem, had to do with the Constant Velocit setting in Mach. The X or y was starting up befoe the Z finished up decelerating to keep the tool moving at a constant velocity in the turn. Turn on exact stop or play with the accelerations and CV settings to minimize the problem.
Craig
Here's what its set to right now
X and Y the same: 500 ipm and 111.7 Accel
Z: 40 ipm and accel 2.5
I thought I had the Z faster but I was way off. Think I'll start there and bump it up some.
What's a good starting point to set the accel? about 40% of the velocity?
My CRP 48 x 48 build [URL="http://www.cnczone.com/forums/open_source_cnc_machine_designs/144173-crp_4x4.html"] CRP 4x4[/URL]
Set it to somewhere between 5 and 10.
Also, In general Config, set "Stop CV on angles" to 89 or 90.
Gerry
Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
Thanks! That seemed to take care of it
My CRP 48 x 48 build [URL="http://www.cnczone.com/forums/open_source_cnc_machine_designs/144173-crp_4x4.html"] CRP 4x4[/URL]
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