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Home Workshop > Members > Forum > Projects Area > CNC > KX3 cutting the Crank

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KX3 cutting the Crank

Bottom#1 Top May-15-12 14:11:05

KX3 cutting the Crank

Well a lot of people asked how it was done and how the code was made for the part. To be honest it was not easy as they seemed to be a lot of formulas for working out the coordinates but none of them allowed the 3 axis to all move together and track the position over the pin and only remove a small cut on each pass. So out came excel and the good old trig book and some of the many formulas. After some hair loss the code took shape using the A axis as the main driving axis and slaving the others to it. To work the Y axis shift was the easiest as this didn't need to adjust for the cut depth. The Z was harder in that both the fact that the cut is taken below the Z0 and that it needs to take a small cut each pass.
% is used to show Modulus
The file used

[Hidden text - guest user]



Code:

PCD = the diameter the centre of the pin follows.

PIN = the diameter of the pin

BAR = the diameter of the bar stock

PASS = the pass

PASSES = the number of pass to take



A = ((A+0.1)%360)

Y = (PCD/2)*SIN(A)

Z = -((PCD)-((PCD/2)*COS(A)+(PIN/2)))*(PASS/PASSES)

Edited By: AdamS
May-18-12 20:15:19

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Bottom#2 Top May-17-12 19:30:48

Re: KX3 cutting the Crank

Adam Stevenson wrote:

PCD = the diameter the centre of the pin follows.
PIN = the diameter of the pin
BAR = the diameter of the bar stock
PASS = the pass
PASSES = the number of pass to take

A = ((A+0.1)%360)
Y = (PCD/2)*SIN(A)
Z = -((PCD)-((PCD/2)*COS(A)+(PIN/2)))*(PASS/PASSES)

Hi Adam,
I was one of the ones asking for the formula. Thanks for posting it. I have a few questions:
Is Z zeroed on the top of the blank?
I'm confused with PASS and PASSES. Are they both constants or does PASS increment by one each full revolution of A? (e.g PASS=PASS + 1 until PASS=PASSES)
If PASS doesn't increase I can't see how it takes a deeper cut after one full 360 degree turn as A will start at zero again.
Apologies if I'm missing something obvious.
Cheers.

Phil.

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Bottom#3 Top May-17-12 23:26:36

Re: KX3 cutting the Crank

Yes the Z was zeroed on the top of the blank and yes PASS does increment each revolution.

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Bottom#4 Top May-18-12 20:08:14

Re: KX3 cutting the Crank

Thanks Adam,

I'm going to have a go at BBC Basic (for Windows) program to generate the gcode.

Phil.

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Bottom#5 Top May-19-12 16:16:06

Re: KX3 cutting the Crank

You can check your results with this script.
http://www.badadam.co.uk/crank.php

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Bottom#6 Top May-19-12 20:12:55

Re: KX3 cutting the Crank

Adam Stevenson wrote:

You can check your results with this script.
http://www.badadam.co.uk/crank.php

Hi Adam,

Thanks for this. Will this stay in place indefinitely?

Cheers.

Phil.

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Bottom#7 Top May-19-12 22:05:10

Re: KX3 cutting the Crank

Yep, till I purge the site and forget what it was for  pint

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Bottom#8 Top Feb-13-13 18:25:11

Re: KX3 cutting the Crank

hi
off topic Iknow. but how do you rate the KX 3 for cutting mild steel etc . what sort of cut depth with 10mm dia cutter ?
regards
Alan

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