CNC Router

what plans did you purchase, thesaent14 ?

Bill Wann, what size stepper motors and what controller are you using n them? They look rather large and powerful.

i have been studying the jgro plans for awhile now, those are availiable for free.
 
not sure f the brand but they are 200 oz motors , the controller is form stepper world . Iam going to go to larger motors maybe servos not sure yet , takes a lot of power to move my mill around.
If your steppers are small your circles will look like crap, the z axis will wobble too much without enough hold .hope that maks sense . Most of these little plywood or aluminum hobbie cnc kits wound not do a good job at cutting acryilc ,just dont have the power and acrylic is apain to work with i use a 1/4 end mill in a 3.5 horse router and it gives me a hard time making 1/2 flanges . I tig welded mine together out of 1/8 wall stell tubing and sill have some flex problems , plywood would be a joke and i doubt you could get it strong enough with using 80/20 extruded aluminum .
 
to give you an idea where all th emoney goesint in these things the most important part is the ground rails and pillow blocks , my rals were 400 each and my pillow blocks were 80 each , I have six rails and 12 pillow blocks . I know these little 1000 dollar unit look nice and they cut wood nice but doing acryic is a diffrent story .you need a seriously beefy machine for this , trust me , i have owned a few of the little one and they suck except for cutting out foam .
 
depends on what you want cut , its not making any hard cuts .
It would probly make ok cuts in 1/8 acrylic but anything thicker would be real hard . using metal pipe as a rail is not too accurate or stable .
I have modifyies my cnc many time to get it to cut acryclic nicely .
You would kill the little routers that can be run on this .
The lead screw that it are useing wont do too god of a job either .
You need at least acme thread screws or ball screws like I use , I tried acme screws a and it was horriable .I suggest getting a book call CNC robotics from amazon and then checking out the cnc zonw website .
wood is easy to cut , it dosent kick back like acrylic .
 
i was tinking in making the body in a welt metal frame and use fast steppers i was tiking on make the hall fram in metal no bolts
 
Yes that makes sense about the z axis wobble, Bill. That seems to be a real concern amongst the folks at the cnczone forum, just reading what others have posted. It looks like the jgro free plan machine could be used to cut parts for its replacement though, and would offer a learning curve while it is being constructed and used to make things. The electronics could also be re-used on a new machine if they are purchased oversized, with this thought of recycling them, in mind. What programs do you use to draw, convert, and cut; Bill?
 
cool link, Harold. Well if anyone's interested, I have about 2/3 of my cnc router cut out, glued, and drying as I type. Can get pix tomorrow, if theres an interest. Have yet to get the pipe and bearings for the x,y,and z axis (maybe tomorrow) and have zero electronics. Just bought a chiller for the tank so the steppers/drivers/powersupply may have to wait.
 
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