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Author Topic: Bit Location  (Read 1840 times)

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Offline kolias

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Bit Location
« on: September 14, 2012, 09:03:53 PM »
Not sure about this elementary question but lets say that I have the square shown on the attached pic and inside the square are a lot of holes / squares and engraving to be cut

Where should I place the bit?
Nicolas

Offline ger21

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Re: Bit Location
« Reply #1 on: September 15, 2012, 06:02:05 AM »
Sorry, but I don't understand what you're asking?
Gerry

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Offline RICH

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Re: Bit Location
« Reply #2 on: September 15, 2012, 06:28:33 AM »
You can place the bit anywhere you want,but, would recommend a starting point X/Y/Z =0 at a place you could duplicate or maybe at an important feature.

RICH

Offline kolias

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Re: Bit Location
« Reply #3 on: September 15, 2012, 07:24:05 AM »
Lets say that you made a drawing of a 10”x10” square with four 2” circles inside the square.

Now if you want to cut this drawing from a 4ft x 8ft sheet and you don’t care about the waste, there is no problem where you start the cutting on the cnc. You just lower the bit anywhere close to the middle of the sheet and you cut the 10”x10” square with the 4 circles inside

But lets say if you already had a piece of 10”x 10” square already pre-cut and you place it on the cnc to start cutting the circles inside. Now you must move the bit precisely at X/Y=0 and then you zero the DRO and then you can cut the 4 circles inside the square at the exact location.

My question is how do you determine that the bit is at the X/Y=0 location
Nicolas

Offline ger21

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Re: Bit Location
« Reply #4 on: September 15, 2012, 08:25:26 AM »
XY = 0,0 would be option F, diagonally opposite D, at the lower left corner.

You can use a probe or edgefinder to find the edges of the part and set them to 0.

Some people use a corner finder that works with a probing routine.

I have fences or stops set at 0,0 that I can just slide my parts up against.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html

Offline kolias

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Re: Bit Location
« Reply #5 on: September 15, 2012, 02:31:03 PM »
Thanks Gerry

Stops at 0,0 sounds a good and convenient idea, I will try to setup something like this too
Nicolas