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Offline dq828

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Tool Setup
« on: June 02, 2017, 01:42:16 AM »
I must be missng somethig obvious!

I want to setup my tool (say 10mm Endmill) so that I set the edge of the tool on the edge of the timber I am going to cut (X & Y) but when I do this the program thinks I have set the center of the tool on the edge of the timber so my cuts are 1/2 the diameter out of place. I have played around (and around) with the offset setting in Fusion 360 and Mach 4 but nothing changes.

Can anyone enlighten me as to what I'm doing wrong?
Re: Tool Setup
« Reply #1 on: June 02, 2017, 01:52:22 AM »
do you use G41/G42 or G40?

Offline dq828

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Re: Tool Setup
« Reply #2 on: June 02, 2017, 02:28:13 AM »
Yes fusion puts a G40 in near the start of the code, I removed it & it made no difference.

I tried a D1 above the T1 as well as removing the G40, nothing. I have shown below the code I have been testing with the Fusion exports.

(17-06-02 V4 OFFSET TEST 9.52MM BIT)
(FEED RATE 1200-200-150- 9.52MM BIT NO TOOL OR OFFSET IN FUSION)
(T0  D=9.52 CR=0. - ZMIN=-4. - FLAT END MILL)
G90 G94 G91.1 G40 G49 G17
G21
G28 G91 Z0.
G90

(2D CONTOUR1)
M5
M9
T0 M6
S10000 M3
G54
M9
G0 X50.24 Y50.
G43 Z45. H0
Z5.
G1 Z2. F200.
Z-1.
G3 X49.76 I-0.24 J0. F1200.
X50.24 I0.24 J0.
G1 Z-2. F150.
G3 X49.76 I-0.24 J0. F1200.
X50.24 I0.24 J0.
G1 Z-3. F150.
G3 X49.76 I-0.24 J0. F1200.
X50.24 I0.24 J0.
G1 Z-4. F150.
G3 X49.76 I-0.24 J0. F1200.
X50.24 I0.24 J0.
G0 Z45.

M9
G28 G91 Z0.
G28 X0. Y0.
M30
Re: Tool Setup
« Reply #3 on: June 02, 2017, 02:34:00 AM »
Hi,

G40 is ok and quite "normal" when using CAM.

If you then run into differences between distances from CAD and distances in real you have to check your tool definitions in the CAM!
G40 means no tool corrections. So the CAM has to calculate the real tool path and for so has to know the exact tool dimensions.
The tool definitions from mach don't come into play with G40.

That means, if you tell your CAM, your tool diameter is 10mm and in real u use a tool with 8mm then you're 1mm off the path (2mm in distance).

Hth Reinhard
« Last Edit: June 02, 2017, 02:36:49 AM by django013 »

Offline Stuart

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Re: Tool Setup
« Reply #4 on: June 02, 2017, 02:45:22 AM »
It's a fusion 360 problem you have the boundary set wrong need it to be on the correct side look at the red arrow on the tool path in the geometry tab flip it over and the tool goes ether inside or out side , e.g. Outside contoured or pocket
There is another setting about tool centre on boundary

I would recommend you post on the fusion forum make sure you post the fd3 file they will sort you out

Offline dq828

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Re: Tool Setup
« Reply #5 on: June 30, 2017, 07:04:00 AM »
Stuart, thanks but I dont think that is the answer. Im sure I'm being retarded and have missed something simple which I'll try and explan in my next post.

Offline dq828

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Re: Tool Setup
« Reply #6 on: June 30, 2017, 08:05:51 AM »
I setup my physical tool position against the edges of the piece of wood I’m going to cut, as shown in the Tool Setup image (I do both x & Y like this), this means the center of the tool is setup half the diameter (offset) from the edge of the wood.

I assumed there was an easy way to compensate for this offset in Mach4 (or Fusion 360) but I have not been able to work it out.

My workaround is, with every drawing I do I in F360, I sketch lines offset ½ the tool diameter and setup on that intersecting point as shown in the Fusion Setup images, but this is obviously not the best way to go about it, but it’s the only way I’ve worked out. When I do this everything cuts fine.

I don’t want to have to play with the code that Fusion outputs to achieve my desirable outcome, I would have thought I could set up my physical tool as per the Tool Setup image, and then setup Fusion so the Origin is on the corner of the stock,  and either Fusion, or Mach4 would compensate for the different diameter tools.

Eventually I found the Tool Offsets in the Mach4 Tool Table and thought my troubles were over, see Tool Table images to see what I setup.

Well was I wrong, when I ran some test code to Bore a hole, the code that came out of F360 looked ok, but when I tried to run it through Mach4, with F360 set for Tool 3, and Mach4 selecting Tool 3 from its Tool Table, things went haywire.

I didn’t notice the wacky toolpath that Mach4 created at first, but when I tried to actually do the cut, not only did it try to follow the wacko toolpath, but it made my Y axis motors trip out! This happened several times  before I noticed the crazy tool path, see image Wacko toolpath 2 image.

When I reverted to Tool 6 which has no setup in the Mach4 Tool Table, the toolpath was fine, the cut was fine, and the motors where fine , see Tool 6 image.

Can anyone tell me how to sort this out?
« Last Edit: June 30, 2017, 08:19:53 AM by dq828 »

Offline dq828

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Re: Tool Setup
« Reply #7 on: June 30, 2017, 08:16:59 AM »
I had issues getting the images to load hence the spread
« Last Edit: June 30, 2017, 08:20:40 AM by dq828 »
Re: Tool Setup
« Reply #8 on: June 30, 2017, 04:59:31 PM »
I haven't used them myself, but would Work Shifts give you a way to correct this?

Allan

Offline dq828

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Re: Tool Setup
« Reply #9 on: June 30, 2017, 07:54:01 PM »
Thanks, where do Work Shifts live?  :)