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Offline TT350

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Changing tool offsets
« on: December 14, 2007, 12:15:57 PM »
I making a part that uses 4 different tools.

The parts are ruffed out in a band saw.

The first tool is a flycutter to cleanup the part
and prep it for the other 3 tools.

After the flycutter makes it’s pass what it leaves
will be Z 0 for the other 3 tools.

Now for the question.

If the flycutter doesn’t cleanup the part on the first pass
and I need to take lets say another .010 to make it cleanup can I go to my offsets page and add .010 
to TOOL#1 and rerun the operation?

I am using a .375 dowel and rolling it under the tools
when setting them up.

T1 is always -.375

Or do I have to go threw the setup again setting

T#0
T#1
T#2
and so on.

Thanks for your time you guys are so much help!

Chris 


Offline Graham Waterworth

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Re: Changing tool offsets
« Reply #1 on: December 15, 2007, 07:59:37 AM »
Normally you would reset the Z datum and leave the tool offsets the alone.

Graham.
America gave us powered flight, England the steam train and Germany the car.  Who invented the first boat?

Offline TT350

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Re: Changing tool offsets
« Reply #2 on: December 15, 2007, 09:06:30 AM »
When you say datum are you talking about T#0?

I have an edge finder that stays in a holder
that I set my X0,Y0 and Z-T#0.

So I put my edge finder back in and rezero T#0?


Chris

Offline Graham Waterworth

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Re: Changing tool offsets
« Reply #3 on: December 15, 2007, 01:08:32 PM »
The proper way to set multiple tools is like this :-

Get into the habit of setting G54 or G55 or G56 etc.

The benefit of this is not realised until you try it. The biggest benefit is that the datum of the job can be moved with ease.

Set G54 X and Y axis to datum point on job.

Your Z axis datum is set by tool 1 or your datum tool e.g. a probe.

Touch your datum tool on top of job.

Set G54 Z to the reading in the Z axis machine dro

Zero out on top of job with above tool.

Load next tool.

Your tool offset is the difference in length between the datum tool and this tool.

Touch on same face, the reading in the Z dro is the offset of this tool, enter this in the offset table for this tool.

Repeat above line for all tools.

If more material has to be removed from face of job then the machine Z datum needs to be moved down. e.g. increase the value of Z in G54 fixture offset

Note

if your datum tool is not the first cutting tool then tool 1 will have an offset, if tool 1 is your datum tool then it will have an offset of zero.

Graham.
« Last Edit: December 15, 2007, 01:14:28 PM by Graham Waterworth »
America gave us powered flight, England the steam train and Germany the car.  Who invented the first boat?

Offline TT350

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Re: Changing tool offsets
« Reply #4 on: December 15, 2007, 05:20:20 PM »
So what you are saying is when I use the end of my edge finder as the master tool T#0
it's a wasted move?

I should start with T#1 and go from there?