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Messages - Ricky Lee

Pages: 1
1
Thanks for your help Ian. I will give your code a try when I get my table up and running.
Trying to find time to build so I can see the results

cheers
Ricky

2
Toolpath shown about half way round the first corner.

3
Hi Stirling, thanks for your reply. Yes your right on the money!
The first video you posted is exactly what I got just using X,Y for a square, with a rectangle I got a parallel line inside the "D"
I have the Z A rotations enabled and the tool path rotates on the screen.
I will try to attach toolpath pic yet again.

Thanks
Ricky

4
Thanks for your replies guys, much appreciated.
I think my biggest problem at the moment is not having my table built so I can see the results. I should be up and running in the next two weeks.

I will try to explain my thinking as clearly as possible. 850x600 rectangle with 100mm radius corners centered on square turntable.
So starting with the first 850 side I move X 650 (850 - two corner radius).
Now I get to the first corner, I need to rotate my job 90 deg on the  100mm corner radius centre.
The turntable must rotate 90 deg every corner to present the next side to me.
I cut out a cardboard shape of my work and pushed a pin in one corner radius, when I rotated 90deg around the pin, I could see this was the correct motion I require, the center of my work was following a large opposite arc, as mach 3 thinks the center of my work is my cutting tool I guessed this was the path to plot.
As the length of the center arc is about 6 times greater than the circumference of the 100mm corner radius, I need to increase feed rate on the corners to match the speed of going along the sides.

Forgive me if this sounds silly but if you put a credit card flat on a piece of paper, draw an arrow on the paper, now pass the entire edge of the card past the arrow tip until your back to where you started. The center of the card being my toolpath.

Regards
Ricky


5
I have tried to upload pics a couple of times but nothing happening.

This is a 10% size g-code the toolpath looks nothing like my 850x600 rectangle with 100mm radius corners.

G54 G90
G00 X0 Y0 A0
G01 X-65 Y0 F1000.
G02 X-15 Y15 I32.5 J-17.5 A90 F6000
G1 X-50 F1000
G02 X0 Y0 I17.5 J-32.5 A180 F6000
G01 X-65 Y0 F1000
G02 X-15 Y15 I32.5 J-17.5 A270 F6000
G1 X-50 F1000
G02 X0 Y0 I17.5 J-32.5 A360 F6000
M30

Regards
Ricky

6
Thanks for your reply, I was very tired and frustrated when I posted.
I have learned more about G- Code and using Mach3. I have started building the system now.
I am building a moving x,y table with a turntable. I have a fixed base 2000mm X 1300mm. On top is my X table 800 x 1300, on that my Y table 800x800 and on that a 1100 x 1100 square turntable.
Mach3 mill would expect me to move my table under a fixed cutter, but I trying to offer the edge of a work piece  centered on the turntable to a fixed welding torch, fixed to the front of my base frame.
I have written G code that looks like it will work, but the toolpath shown is for the centre of my turntable and looks nothing like my workpiece.
I will upload pics and my attempt at G code soon.
Thanks
Ricky

7
Hi,
Complete newbe, first post.
 I am trying to build a table that passes the outer edge of a rectangular flange with rounded corners past a MiG torch max size 1000x650mm
It's a bit like holding a paintbrush out in front of you to paint a stripe around the outside of a biscuit tin as it passes by.
I think I need X,Y and C rotation. The only way I can work out to do this is to have the job centered on a turntable that is driven X,Y.
I think I have worked out a tool path that would work but it looks like a capital "D" on it's back with a Parallel line inside the "D"
I could move X until I get to a corner then rotate the job around the center of the corner radius by rotating the table 90 deg and moving the center of the job in an opposite arc to the corner at the same time.
This all seems a bit messy, is there a better way of passing the edge of your job past a tool like a grindwheel for example.

Im finding this a bit tough for my intro into CNC, If only I could have started with a 3 axis mill.

Ricky

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