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electromanj
04-15-2007, 10:11 AM
Hello, I would like to contruct a stamp controlled pcb drill machine. Any suggestions for getting started? I see that parallax offers stepper motors. Has anyone built one?
Thanks!

Franklin
04-15-2007, 11:31 AM
One-off or production? the stamp should be able to control the steppers and depending on your design should be able to repeat a position well but there is a lot of mechanical work needed. Tell us what you have planned.

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- Stephen

electromanj
04-15-2007, 11:43 AM
The mechanical part I can handle. I guess my first questions are:
1. I am only familiar with the bs2. Will this be adequete?
2. I am also curious about a source for couplers for the stepper motors. I plan to couple the motors to allthread for the x y movements, unless someone has a better suggestion.

RDL2004
04-15-2007, 06:28 PM
There is a big long thread about a milling machine that may have some useful info for you.

http://forums.parallax.com/showthread.php?p=539099

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- Rick

Newzed
04-15-2007, 08:44 PM
Electro, I would strongly suggest you change to a Propeller.· My SuperMill was originally controlled by a BS2E and it worked pretty good, but it had its limitations.· Suppose it takes 5015 pulses to move the X axis 100 mils.
If you want to travel 1 inch, that is 50150 pulses, which is approaching the limit of Stamp's capability.· If you want to travel 1.5 inches, it takes one command to travel 1000 mils and a second command to travel the remaining 500·mils.· With the Propeller and its 32 bit number, I can travel 6000 mils, which is the X limit of my mill.·

Now suppose I want to travel 749 mils.·· With the Stamp I would write:

pulses = 5015*/$077D = 35,731 pulses

With the Propeller I write:

pulses = (749 * 5015)/100 = 37,562

That is a difference of· 169 pulses, which is about 3 mils.· I could go on but I think you get the idea.· Run some math where you are limited to 65535 for the Stamp, then run the same math where you are limited to 4,294,000,000 with the Propeller.

If you have any question about my SuperMill, I will be happy to answer them.

Sid

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electromanj
04-16-2007, 02:07 AM
thanks for the tips and links. alot of good info there.