I crtainly hope this thread hasn't died - haven't seen anything for some time.
Anyway, I wanted to make a little board with an SSOP chip but I wasn't sure I could do that with SuperMill.· Decided to make a trial run and here are the results.· I made two errors.· If you look at the picture with the chip you will note that two of the lands are missing.· They lifted when I tried to tin the board.· I should have cut the two vertical paths in the middle of the pattern before I cut the horizontal paths, and second, I wasn't using FR-4 material.· I think the copper adhesion is better on the FR-4 than on the cheaper laminate I was using.· Alignment is pretty good, as you can see by the picture with the chip.
Does anyone have a small piece of FR-4 - say 2 or 3 inches square -·they would like to donate to a good cause?
Sid
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Don't have VGA?
Sid, · ·· Encoders are usually optical or hall-effect and provide feedback to the main microcontroller as to how many steps the motor actually moved in relation to how many steps it was supposed to have moved.·
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It takes 2568 pulses to move the X axis .100 inches.· That is equal to
.0000375 inches per pulse.· Can you imagine trying to track that with an encoder?
Sid
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Don't have VGA?
Sid, · ·· I was generalizing…On CNC machines the encoders can be more complex and actually monitor linear motion of an axis, regardless of the steps the motor takes to get there.· The concept is to monitor motion to be sure the unit actually moved.· What if the stepper motor was sent 2568 pulses, but several missed or the stepper was jammed?· How would you know if the unit moved the correct distance?·
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔ Chris Savage Parallax Tech Support
Just got a Sears flyer in the mail.· They are taking pre-orders for·what is basically a Craftsman CNC router for about $1800.00.· It won't actually be available until the end of December.
It looks like a benchtop thickness planer with a Dremel-like tool sticking up through the top.· It has·some built-in·designs and can read desgns from a memory card.· New designs can be created on a PC and saved to a memory card.
It would be interesting to see one up close when the come out.
Chris Savage pointed me to this thread, and I was wondering if someone could help me make my own cnc machine? Most likely using the Propeller, since it's what I'm learning to use, & since the SX chip has reached its EOL. Not just for pcbs, but for some other uses as well, probly nothing like steel or hard wood. I have some buttons I wish to make & a cnc machine would be usefull.
Joe
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I'm going insaine. It's SOOOOOO much fun. lol
It is a good machine, in kit form, and just needs the motors, drives, and controller to finish it off. The controller is typically a PC running one of the CNC programs--EMC, Mach, TurboCNC, etc. Motors and motor drive electronics choices abound, mine uses Gecko step motor drives (www.geckodrive.com/) and a PMDX breakout board (www.pmdx.com/BreakoutBoards).
There is no particular reason you could not build the machine from scratch. Nor is there a reason that the Propeller could not adequately serve as the controller--you would just need to roll you own CNC software.
Well right now spending about $600 is out of the question. I downloaded TurboCNC. I'm just not sure how to make the propeller operate a cnc via the software.
Joe
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I'm going insaine. It's SOOOOOO much fun. lol
Good thing a spammer bumped up this thread, because I have never seen it before. Now that I have it bookmarked, one of these days when I have spare time, I will have to read it,
Comments
Sid
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Sid Weaver
Need a TV Module?
Newzed@aol.com
·
Anyway, I wanted to make a little board with an SSOP chip but I wasn't sure I could do that with SuperMill.· Decided to make a trial run and here are the results.· I made two errors.· If you look at the picture with the chip you will note that two of the lands are missing.· They lifted when I tried to tin the board.· I should have cut the two vertical paths in the middle of the pattern before I cut the horizontal paths, and second, I wasn't using FR-4 material.· I think the copper adhesion is better on the FR-4 than on the cheaper laminate I was using.· Alignment is pretty good, as you can see by the picture with the chip.
Does anyone have a small piece of FR-4 - say 2 or 3 inches square -·they would like to donate to a good cause?
Sid
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Sid Weaver
Don't have VGA?
Newzed@aol.com
Ive been meaning to ask, do you have encoders attached to your stepper motors?
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- - - PLJack - - -
Perfection in design is not achieved when there is nothing left to add.
It is achieved when there is nothing left to take away.
By encoder, do you mean controller.· I use two IB463s and a Gecko.
Sid
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Sid Weaver
Don't have VGA?
Newzed@aol.com
·
·
·· Encoders are usually optical or hall-effect and provide feedback to the main microcontroller as to how many steps the motor actually moved in relation to how many steps it was supposed to have moved.·
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Chris Savage
Parallax Tech Support
It takes 2568 pulses to move the X axis .100 inches.· That is equal to
.0000375 inches per pulse.· Can you imagine trying to track that with an encoder?
Sid
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Sid Weaver
Don't have VGA?
Newzed@aol.com
·
·
·· I was generalizing…On CNC machines the encoders can be more complex and actually monitor linear motion of an axis, regardless of the steps the motor takes to get there.· The concept is to monitor motion to be sure the unit actually moved.· What if the stepper motor was sent 2568 pulses, but several missed or the stepper was jammed?· How would you know if the unit moved the correct distance?·
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Chris Savage
Parallax Tech Support
On another note.
There is an excellent two part article on converting a Harbor Freight table top mill at BalBots.
They can be found here.
www.balbots.com/article_info.php?articles_id=10
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- - - PLJack - - -
Perfection in design is not achieved when there is nothing left to add.
It is achieved when there is nothing left to take away.
Just got a Sears flyer in the mail.· They are taking pre-orders for·what is basically a Craftsman CNC router for about $1800.00.· It won't actually be available until the end of December.
It looks like a benchtop thickness planer with a Dremel-like tool sticking up through the top.· It has·some built-in·designs and can read desgns from a memory card.· New designs can be created on a PC and saved to a memory card.
It would be interesting to see one up close when the come out.
Found it online at: http://www.sears.com/sr/javasr/product.do?cat=Bench+Power+Tools&pid=00921754000&vertical=TOOL&subcat=Jointers%2C+Planers+%26+Shapers&BV_UseBVCookie=Yes
I have no connection with Sears or Craftsman.
Post Edited (bubblehead) : 11/27/2006 11:24:29 PM GMT
If someone, anyone kitted up a CNC router that did circuit boards, they'd be instantly rich.
Eric
PS I know an old thread.
·
Joe
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I'm going insaine. It's SOOOOOO much fun. lol
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
I'm going insaine. It's SOOOOOO much fun. lol
Joe
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
I'm going insaine. It's SOOOOOO much fun. lol
It is a good machine, in kit form, and just needs the motors, drives, and controller to finish it off. The controller is typically a PC running one of the CNC programs--EMC, Mach, TurboCNC, etc. Motors and motor drive electronics choices abound, mine uses Gecko step motor drives (www.geckodrive.com/) and a PMDX breakout board (www.pmdx.com/BreakoutBoards).
There is no particular reason you could not build the machine from scratch. Nor is there a reason that the Propeller could not adequately serve as the controller--you would just need to roll you own CNC software.
Daniel
Post Edited (daniel) : 3/29/2010 12:51:04 PM GMT
Joe
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
I'm going insaine. It's SOOOOOO much fun. lol