First pass was too deep!

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OCEdesigns
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Re: First pass was too deep!

Post by OCEdesigns »

WNC_Ed wrote:Try setting your Z zero manually
The Z plate on the shark is a convenience but I have found it to be a tad bit “unreliable”.
I was going to check the calibration on the touch plate, but I will also definitely try to set it manually and do another test piece.
Thanks!

OCEdesigns
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Re: First pass was too deep!

Post by OCEdesigns »

I was doing some tests and found a few things. These were not as noticeable on wood but showed up a lot on the aluminum.

First is my plunge rate with the touch plate was too fast. 10 IPM and causing it to "Push down" on the material too quickly before reading it. I slowed it to 5 IPM then to 2 IPM and at 2 IPM I get much more accurate readings.

Second which kind of relates to the first is the inherent flex in the spindle mount / Gantry also contributed to the depth issues.
Now I tested the touch plate about 15 times at the 2 IPM. Each time I used the touch plate in different areas and then checked it's accuracy manually with a piece of paper and now each time it is very close to zero. Within 1 to 3 thousands. I then ran another test run on aluminum. First pass was set to 0.010 and actually cut that!! I ran a set total depth of 0.030 and ended up with 0.036. For using a machine designed for wood and getting that close on Aluminum I'm pretty happy now.
I was really hoping to not use a spoil board because I use my clamps in a lot of different ways. I may need to look into it more and get creative on the board for for my clamping needs.
Thanks again for all the responses and ideas. Not sure it's 100% figured out but I now know I'm much better!!

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WNC_Ed
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Re: First pass was too deep!

Post by WNC_Ed »

OCE,
Great info - Thank you for chasing that down.
First chance I get I will adjust my feed rate and see if that helps mine as well.
Maker of sawdust

OCEdesigns
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Joined: Fri Feb 08, 2019 1:52 pm
Model of CNC Machine: Shark HD4 Extended with VCarve Pro 10.5

Re: First pass was too deep!

Post by OCEdesigns »

WNC_Ed wrote:OCE,
Great info - Thank you for chasing that down.
First chance I get I will adjust my feed rate and see if that helps mine as well.
You're welcome! Hopefully this helps others

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WNC_Ed
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Re: First pass was too deep!

Post by WNC_Ed »

Just a quick follow up.
Changed the plate plunge rate to 2 IPM.
That certainly seemed to solve the unreliability issue for me.
Thank you again - OCED!
Maker of sawdust

OCEdesigns
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Model of CNC Machine: Shark HD4 Extended with VCarve Pro 10.5

Re: First pass was too deep!

Post by OCEdesigns »

WNC_Ed wrote:Just a quick follow up.
Changed the plate plunge rate to 2 IPM.
That certainly seemed to solve the unreliability issue for me.
Thank you again - OCED!

Nice! I'm glad to hear it!! This also helps me prove to myself that this was the main issue I was having. Thanks for the update WNC_Ed!! 8)

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sharkcutup
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Re: First pass was too deep!

Post by sharkcutup »

I know this may sound a little trivial but where exactly are you changing the plunge rate for the Touchplate process?? The answer will not only help me but others here who have tuned in to this thread!!!

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WNC_Ed
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Re: First pass was too deep!

Post by WNC_Ed »

where exactly are you changing the plunge rate for the Touchplate process??
It is a pendent operation - Not near the machine but think it is in "Apps>Touch Plate Calibration"
Maker of sawdust

OCEdesigns
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Model of CNC Machine: Shark HD4 Extended with VCarve Pro 10.5

Re: First pass was too deep!

Post by OCEdesigns »

WNC_Ed wrote:
where exactly are you changing the plunge rate for the Touchplate process??
It is a pendent operation - Not near the machine but think it is in "Apps>Touch Plate Calibration"

This ^^^

You can change a few things here.

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sharkcutup
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Re: First pass was too deep!

Post by sharkcutup »

OK thanks!

That seems to be a Shark HD4 thingy. I own the previous a Shark HD3 Pro model which does not have a PENDANT!

I have often wondered if there was a way to slow down the Plunge Rate during a Touch Plate Process. It seems to be a tad fast and sometimes it does not recognize the plate and keeps pushing downward --- not often but it does happen on occasion.

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