Re: [CAD_CAM_EDM_DRO] wish list, case histories
Posted by
james owens
on 2000-04-04 05:14:02 UTC
I am starting with a bare Bridgeport type machine. I say type of machine because it is an old warn-out Beaver which has power feed on the X axis and the quill at one speed only and movement in many other planes.
Looking at the front of the machine. The head moves in and out and side to side. It also knods side to side and back and forward. The quill has about 8" of travel. Then there is the table that has X and Y and also the knee moves up and down.
Give or take the odd inch it is the same size as a tool room Bridgeport.
The idea was to convert to full CNC as knowledge and hardware became available and use a modular approach so that little is wasted and others could follow the idea and stop when they had a level of hardware that they wanted.
To the PIC based DRO which is the first step.
I see it based around USDigital's encoders because they are cheap and the company gives great service. Linear strips for the main axis at 360 lines per inch 1440 in quadrature and rotary input at 2000 lines per rev 8000 in quadrature which equates to the 2" disk.
The next step would be to feed the output of the HEDS**** into a counter which could be LS7266R1 or LS7166, both of these devices are from USDigital and are up-down counters.
Data at this stage could be made available out of the unit for direct input to a computer with a PIC across the bus doing the maths and feeding a LED display driver or a much cheaper LCD display that can be driven straight from the PIC. I would use a 16F877 if only because that is what I have and haven't learned how to use it yet. It would be nice if it was possible to use either LCD or LED.
It should be possible to include all of the suggestions that have been made on this list if one PIC controls each axis and is mounted in its own box with its display and output strip to a computer. A power supply could make up the base with each module plugging into it producing a stack.
There is no need for the PIC to do any of the maths for the computer output as this machine can do floating point maths much more quickly and easily.
I can do all the hardware and the artwork for the curcuit boards. I already have all of the components I have writen about. What is stopping me is the amount of time I spend at the computer and lack of knowledge about the electronics.
Regards,
Terry.
Looking at the front of the machine. The head moves in and out and side to side. It also knods side to side and back and forward. The quill has about 8" of travel. Then there is the table that has X and Y and also the knee moves up and down.
Give or take the odd inch it is the same size as a tool room Bridgeport.
The idea was to convert to full CNC as knowledge and hardware became available and use a modular approach so that little is wasted and others could follow the idea and stop when they had a level of hardware that they wanted.
To the PIC based DRO which is the first step.
I see it based around USDigital's encoders because they are cheap and the company gives great service. Linear strips for the main axis at 360 lines per inch 1440 in quadrature and rotary input at 2000 lines per rev 8000 in quadrature which equates to the 2" disk.
The next step would be to feed the output of the HEDS**** into a counter which could be LS7266R1 or LS7166, both of these devices are from USDigital and are up-down counters.
Data at this stage could be made available out of the unit for direct input to a computer with a PIC across the bus doing the maths and feeding a LED display driver or a much cheaper LCD display that can be driven straight from the PIC. I would use a 16F877 if only because that is what I have and haven't learned how to use it yet. It would be nice if it was possible to use either LCD or LED.
It should be possible to include all of the suggestions that have been made on this list if one PIC controls each axis and is mounted in its own box with its display and output strip to a computer. A power supply could make up the base with each module plugging into it producing a stack.
There is no need for the PIC to do any of the maths for the computer output as this machine can do floating point maths much more quickly and easily.
I can do all the hardware and the artwork for the curcuit boards. I already have all of the components I have writen about. What is stopping me is the amount of time I spend at the computer and lack of knowledge about the electronics.
Regards,
Terry.
----- Original Message -----
From: Bill Coghill
To: CAD_CAM_EDM_DRO@egroups.com
Sent: Tuesday, April 04, 2000 10:48 AM
Subject: Re: [CAD_CAM_EDM_DRO] wish list, case histories
Would you want a PC interface with an on screen display of X Y Z ? I just
re-read the original post and it seems you want to be able to use the
positions to input points in CAD software. I can do the hardware and the
PIC software, with the option to send out serial data to a PC, but I'm
afraid I'll have to leave it to someone else to do the PC software part.
Never been that hot at that stuff...
What would you guys like to have ?
If I can get a features wish list then I'll start looking into it pronto.
Bill.
on 4/4/00 12:14 PM, Jim Geib at jimg47@... wrote:
> Don't Stop tell me more???
>
>
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