Cheap CNC ….Will it work ?
Dogwood,s and Yellow Ninja,s conversions made me get all the parts i had and start again on converting my machine. Getting rid of the crap nuts and screws was the first thing, replaced with ACME 16MM X 5 screws.
Well this is the way im going , i dont have enough room to have motors sticking out so im having to go the belt drive route. Now this int cheap belts , pulleys and angular contact bearings add up quickly so ive gone with ACME screws to cut the cost. The ACME screws will also allow me to maintain manual control , despite everthing ive read that says you wont use it arfter the conversion. Ballscrews cost just too much at the moment but i will use ballscrews for the Z axis for the low friction.
Acental anti backlash nut as on Figgnoggle’s web page
For my control and motors ive gone for the Hobby CNC board which i soldered together about 2 years ago , which run 200 oz motors. These motors will run the machine but not at startling speeds 😕 but the pulleys should give me all the torque i need to cut alloy . Im going for the HOSS machine route for the Z axis running a 370 oz motor .
Remember the rules …..this will take along time / im not responsable ect… ect…
L8r all
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perhaps not with your motors, they probably have a more linear torque curve.
On my current Z setup I’m convinced the gearing is the problem I’m having, stalls like mad if I try and go over 6 IPM, and trust me the Z isn’t something you want only moving at 6 IPM.
From what ive read , 270 oz motors for the X / Y axis and 370 / 425 oz for the Z seams the best size of motors. As you say Dogwood ,the 425s are abit too much and the smaller motors seam to work better ” being worked ” rather than a bigger motor taking it easy . Ive seen the X2 run on 200 oz motors on direct drive and it worked fine. Theres alot of people on the net spending loads of cash and over doing there conversions just so the can get high feed rates that there never use other than in jog function. Il wait ….its only traveling 175mm !!!
I did alot of research afew years ago when i decided on the belt drive and gearing down , which i ve forgot !, so il have to see how the gearing down works out 😕 . Do you think the gearing down will cause the motors to stall easier Dogwood ?.
Got to wire the electrics together and find a PC to run it all yet. Then go back to the bad old days and try and remember the programing and CAM i use to run ……errrrr!!!. 👿
Im hoping to get the machine roughly working then maybe go to ballscrews / bigger motors at a later date but the truth is im not arfter a fantasticly accurate machine ……..unless i start making jet engines……..hmmm!
Looking good Buba !
Looks good, but I wouldn’t worry to much about gearing it down, that actually will cause more problems than it would solve.
You really don’t need that strong of a motor to run these, the 425’s I got are over kill and actually a hindrance in some way.
The way steppers make there power is they have all there torque at 0 (zero) RPM, once they start spinning they loose torque, how much and how fast depends on the motor and the power supply, but generally the larger the faster. (hence my remark about my steppers)
the lost torque while moving will allow it to stall easier.
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Must stop reading….Must fight urge to go CNC…..Ahhhhhh!
If I could spare the down time on my mill I would be elbow deep in CNC bits. I let YN do all the dirty work and he will have to hold my hand when I choose to convert.
The best part is once you guys are all done. We can place orders for our mounting kits 😛