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Messages - ART

1561
PSSS....

  I got a secret!!.

  PSSS- Planning, strength , speed and stability..

  Well, Ive planned this before. So have a few thousand others. A router table. How much easier can it get, all you need
is a table, a router , some motors, drivers, wires, and a breakout board. Sounds pretty simple, after all they all plug together
work out of the box, right? Wrong!. Well, OK,..sometimes..

  There are many ways to start. Some of you will just want to buy a table on the internet, and get running. No problem there, right?
WRONG!. The internet IS a great place to buy a table, and many of the builders out there are fantastic at supporting their products,
and they sell great products. From motors, to drivers, to frames, skeletons, bearings, gantries and full "turnkey" systems. But that doesn't
make it plug and play, nor does it mean they match your needs. You need to PLAN!!, I didn't on my first, planned quite a bit on my second,
and intend to plan all to hell on my third. (Does this tell you something. :) ). Planning is very important even if you intend on buying a finished
routing system complete. Planning takes into account all the rest.. Speed, strength , stability and a whole lot of other things not listed in above.
Planning lets you hit the snags in the rebuild stage, which can save you lots of time and money..

 Remember the ramplings  I talked about earlier in the topics.. this is one of them..

Money: How cheap can I go. ?

  This is a pretty typical question. With no absolute answer. My own philosophy is cheap is good, but you have to tie that into my other
philosophy  "If it works, its a good solution.". The test of any system is , in the end, does it work well. "Well" is a relative term. Some want
very fast, others will take what they can get..  Ive done this to much to "take what I can get.". Cheap usually means bad, inexpensive is a better
term.

  I wont be purposely picking on any vendors here, and Ill ask no one else to do so as well. Being that quality is relative to what you need, one mans junk is another's
treasure. That being said, cost is a factor to consider and the term "You get what you pay for" is something you need to trust to be true. For example,
a Gecko 201 ( A motor controller) , last I checked, was about 120 bucks a pop. Thats roughly 300.00 for a 3 axis system. Check on Ebay and you'll find many at
about 39.95 for three axis. Which one do you think works better? If you said the 39.95 one, please slap yourself for me, as my keyboard doesn't have that function.

  You know, as well as I , that a 39.95 3-axis whizzbang is not going to function as well as a 330.00 set of motor drivers. Is the 39.995 junk? No, not necessarily, but it
may be designed to do something lighter than what you want.  Thats not to say either that the $600.00 per diver motor drivers are better than the 300.00 ones.
They may be, depends on the system, the use and the reason your using them. (Nothing is simple, eh?  -- we Canadians say -eh? allot..).

   My general rule is to check any driver , power supply, bearing...whatever, carefully with other users. The Mach3 group , for example has about 6000 of them.
All great people that are happy yo tell you of their mistakes, and experiences. (Hopefully mistakes not being using Mach3., eh? ).

   So when contemplatling any component, check around, a single saved mistake can save you time and money. OR you can be like me with shelves filled with
stuff you replaced and really wouldn't use again, but too good to throw away..  So .. to stop rambling.. CHECK OUT YOUR PLANS..Don't cheap out unless others tell you
its OK to. I'm sure many will shudder at some of the things I do, but on the other hand, I need only live with myself and my friend Bob, and we'll undoubtedly curse
each other frequently. (We always have..).

   When planning a table, consider everything you want to use it for. Size increases cost. More importantly, it increases space. I once had half my basement filled with table,
till Bob was kind enough to take it to his place, now HE has a garage full of table. (And adding his third..this one we'll be building as we go on this forum.. )
Of course for some space is available, so if likewise, money is as well, then 4x8 foot is awfully nice to have. For many though, 4 x 4 is a good compromise.. With a stand
and turning things around even a 4x4 can cut 4x8..just a bit more work is all.

  Speed is a function of the motors and the mechanics. As well as the software. We'll go into that in another topic, but just so you know that end resultant speed is
tied to many things other than just motors and dirvers.

 Stability is very important. My first table was built with some Thompson linear bearing, good, but not great ones, and flimsy gantry strenth. I regretted it quickly.
Being Strong usually means heavy. Heavy is good. Flimsy is bad. I know, youve seen tose wooden gantrys out ehre using drawer slides as bearing. Yes, they will
work, but I havent met the person yet who didnt rip it all apart and rebuild. So its a great learnign experience, but you probably wont like the end result. You
want strength and power, in equal measures to make a good router table. Not a bad idea to ask others what they think of your design as well. (I wont do that as I
have a sensitive nature and hate to be laughed at, but then I probably have more spare parts than you, so Im not really wasting much by trying.:), and besides,
you may gain from watching my mistakes and my redesigns to fix our troubles..

to be continued...

Art




1562
Hello Newbie: (As they will call you.. :) )

   Over the last 5 years or so, Ive answered a few thousand questions from beginners and pro's alike on CNC in general, and in specific.
Thats not to say I can answer anything in specific, but Ive picked up enough to be fairly generalised. If your new, thats probably where you
should aim. The topics in this section fo the forum are meant to aid in getting started in CNC, and in the end, to show the creation, from early steps
to a completed router table along the way.

  Recently, while attending a gathering of signmakers and others dabbling in CNC control of a router table, it was put to me that most dont
know enough to begin. I must admit that it is daunting to enter our world. The terminology can be frighteningly obtuse to someone
who , for whatever reason, has deciided to get into computerised movement, and has the impression that its all plug and play.

   Many have asked how to build a router table (probably the most popular use of generalised CNC ), and it just so happens Im about to go down
the road of my third full Router table. This leads me to think that others may want to travel that road with me, in steps, as I go. Since its an opportunity
to show, in great detail and with some side trips along the way to explain the scenery, its my intent to start this topic here, show photos and such of the
building process, along with mistakes, design errors, and problems encountered as we go. Weve done this bfore so we have a pretty good idea as to how not
to proceeed , (which is about as much as experience will normally give you..), so with all our great idea's in mind, your invited to follow myself, and my buddy
Bob, as we begin to create another machine to move us closer to complete insanity.

  Most importantly, the topics here will start to add up to an explaination of what youll face, and what Im facing as I go. Side topics will be added as
this progresses, to explain things like motor power, drivers, power supplies, hookups, MPG's, spindles, VFD's..all the toys we intend to implement, what they
are, what they mean, and how they work.

  Much of the topics here will truly belong in other areas of the board, but while the board is a great place to get support, or to search for interesting topics
to your situation,  this area, will be designed for flow. The logical process of going from point "A" (what the hell am I doing) to Point B (Wow, Im cutting stuff..).

  Be warned, its a long arduous journey, full of pitstops, timeouts, and frustrations, but then, if your here, you may already have those frustrations, so perhaps
this forum will back you up a bit, to the point where you can do a sequenctial flow to success, and at the least, have a better, more visual understanding of what
you want to accomplish.

   I'll try to discuss things of import to everyone, so this is likely to be a rambling topic forum, which if it all works out will probably give greater "instant gratification"
understanding than the general forum, and the questions within. In other words, this is the generalised place of knowledge, while the rest fo the forum is a place of
specicifc knowledge.

   Feel free to ask questions as I go, they may be shunted to various other sections once answered as we'll try to keep a certain flow going here, from first steps,
to completed machine. This is a personal project of mine though, and I DO tend to ramble and veer on and off topic at times, so dont expect a truly linear approach.


  OK, all that having been said..   Im hoping this helps those of you thinking of building a table, or those with one, that want to improve it..



Art

1563
General Mach Discussion / Re: Softlimits
« on: October 09, 2006, 09:58:00 PM »
Chris:

  Too general a report. I need to know exactly what your doing when you get the error. Does it happen only when you get a
G43 loaded up, or what?

Art

1564
General Mach Discussion / Re: MAXNC10CL and MACH3 issues
« on: September 30, 2006, 02:32:47 PM »
Hi Guys:

 Im sorry I missed this for so long. One probelm here may have been the settings..


Output#16   Port 1  Pin 16    Actlow X
Output#17   Port 1  Pin 17    Actlow Ena

 

  These two above are wrong. OUTPUT shoudl not be the signal used. These shodul be connected to ENABLE1 and ENABLE2, for

ENABLE#1  port 1 pin 16 Active Low enabled.
ENABLE#2 port 1 pin 17  Active Low Disabled

  I know Im late, but just in case it helps. :)
Art

 

1565
General Mach Discussion / Re: Encoder/MPG questions
« on: September 30, 2006, 02:25:12 PM »
Hi:

  Comparison, and error triggering are possible with a macropump script. Its been done by Ron Rogers as a product, and by many as personal code.
The real use of encodersin MAch3 is for manual machining. I hope to have a dedicated DRO mode in the near future with encoder use in mind.

Art

1566
General Mach Discussion / Re: Softlimits
« on: September 28, 2006, 09:37:10 PM »
Thanks, Im looking into it, I must have screwed up a negative sign.

  As to regening, it shoudlnt be necessary , rezeroing is taken into account so an autoregen woudl only hurt, particularly on large files..

Anyway, Im off to the code base.. :)

Art

1567
General Mach Discussion / Re: Mach 3 for vertical lathes?
« on: September 27, 2006, 11:20:04 PM »
yeah, the driver part was the most difficult.. :)

Art

1568
General Mach Discussion / Re: Mach 3 for vertical lathes?
« on: September 27, 2006, 10:44:20 PM »
Hi:

 Kinda what I figured. Its not so much the code, its functions you need. Some of those dont exist in Mach./ There is no way to add them, and it wouldnt be trivial to do so.

G10 - Set to Radius programming
G11 - Set to Diameter

   >> This one woudl be easy, since both radius and diamter do exist.

G70 - Inch programming
G71 - Millimeter

  >> This is already implemented.


G33 - Constant lead Threadcut
G34 - Variable lead Increasing
G35 - Variable lead Decreasing

  >> Again, these dont exist, so impossible..

G53 - Cancel Part Offsets

>> G53 is there, but not modally so.

G60 - Clear Inhibit zone
G61 - Activate Inhibit zone
G62 - DeActivate Inhibit zone

  >> No inhibit zones exist to control in MAch

G92 & G98 - Insert Cartesian presets
G99 - Cancel Presets

  G92 exists, but G98/G99 have different meanings..

>>G93 - Velocity/Distance feerate mode

  Again, not too bad..

 All in all, its a case of wanting features, not so much code changes. Sorry, wont happen in any short term..

Art


1569
General Mach Discussion / Re: Mach 3 for vertical lathes?
« on: September 27, 2006, 02:35:33 PM »
Which codes woudl require the change?

Art

1570
General Mach Discussion / Re: (Newbe) Axis Gain
« on: September 22, 2006, 05:36:13 PM »
Ill have to wait for someone else to answer this one, Ive never used keygrabber.


Art