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seana
09-16-2005, 03:46 PM
Hello,
I am new to botting and have a used one with double z's which are great.
I have been reading here on the forums and learing a lot, thanks to all.
I have noticed on some of your web and blog sites that you can square the corners on routered cabinet doors.
I have a general idea how to do this but would like the input from the pro's.
I'm guessing that you have to set up tool paths in 3d. Am I close?
Does it matter on the door detail, chamfer or bead?
I use Autocad LT and Partswizard.
Thanks in advance.
Sean

richards
09-16-2005, 04:51 PM
Hi Sean,
The basic procedure to cut inside corners square, if you're using a V-bit is to run a M3 command at each corner.

Assuming that you're using a 90-degree V-bit and that you want to cut an 8x10 rectangle shape at -0.25 inch depth, you could use this code:

' initialize
SA
JZ,1
J2, 1.0, 1.0
SO, 1,0

' cut a 8 X 10 rectangle at -0.25 inch depth
JZ, 0.1
MZ, -0.25
MX, 9.0
MY, 11, 0
MX, 1.0
MY, 1.0
JZ, 0.25

' square up bottom left corner
J2, 1,1
MZ, -0.25
SR
M3, -0.25, -0.25, 0.25
M3, 0.25, 0.25, 0.0
SA
JZ, 0.25

' square up bottom right corner
J2, 9,1
MZ, -0.25
SR
M3, 0.25, -0.25, 0.25
M3, -0.25, 0.25, 0.0
SA
JZ, 0.25
' square up top right corner
J2, 9,11
MZ, -0.25
SR
M3, 0.25, 0.25, 0.25
M3, -0.25, -0.25, 0.0
SA
JZ, 0.25
' square up top left corner
J2, 1,11
MZ, -0.25
SR
M3, -0.25, 0.25, 0.25
M3, 0.25, -0.25, 0.0
SA
JZ, 0.25

' finished
SO, 1,0
J2, 0,0
JZ, 1.0
END

If you use a cutter with a different angle, divide the cutter's angle by 2, find the tangent of that angle, and then multiply the depth of cut by that number. EXAMPLE:

Cutter = 60 Degrees
Depth = 0.22

60/2 = 30
TAN(30) = 0.57735
XY moves = 0.57735 X 0.22 = 0.127017

Cutter = 120 degrees
Depth = 0.28

120/2 = 60
TAN(60) = 1.73205
XY moves = 1.73205 X 0.28 = 0.4849

By the way, Bruce Clark wrote an excellent graphic interface for my door program that does most of the work for you. If you'd like a free copy, send me an email.

-Mike
miker@xmission.com (mailto:miker@xmission.com)

seana
09-17-2005, 01:08 PM
Mike,
Thanks for the detailed response. I was on the right track and you really cleared up some of the fog.

So is there a way to square the door corners when you are using a different bit besides the v grove?
Say a round over?

Thanks again
Sean

bleeth
09-17-2005, 01:41 PM
Sean: You can't bore a square hole with a round bit!!


Seriously, although it is possible to use a small diameter ball nose to come close the v-bit option is the one that does the job efficiently. When your design calls for a flat bottom area you can run a last perimeter pass with a small diameter mill end but remember that the more bits you use the greater challenges you will have in perfectly zeroing the z height of the bits. If that were my design I would clean out the inside corners with a chisel.
I would avoid round bottom channels if my goal was a crisp corner.
A good point to remember is that most projects take more than one tool to build.
V bits are the only way to get a crisp inside corner.

Dave