[nokillzone]

i am slowly building my new CNC
this is as far as i have gone ..

i need to figure out motors and drive force,...
i am thinking nema 34 .dual shaft....... 1090,1232 or 1600

not sure what to look for ...


and 2 long ballscrews... conected via chain ?
not 100% sure on that ,,

my z is built but didnt take pics of it .. just need to figure how where to mount motor.... ,, i will post pics once i see people interested in helping me out...

[ger21]

i need to figure out motors and drive force,...
i am thinking nema 34 .dual shaft....... 1090,1232 or 1600

What size is the machine? How fast do you want to go?
What size and pitch ballscrews?

In most cases, large motors like you listed are a poor choice, unless you have screws with a very high pitch. They don't have much torque at higher rpm's and can't provide high speeds.

Also, don't use chain, it has too much backlash. Use timing belts if you want to connect two screws together.

[widgitmaster]

You have already built a sturdy welded frame using square rails & trucks, why not add rack & pinion to complement the existing parts!
If you use the CNCRouterParts belt reduction system with their 7-Amp NEMA34's, you will have a great machine!
Widgit

[LeeWay]

You have already built a sturdy welded frame using square rails & trucks, why not add rack & pinion to complement the existing parts!
If you use the CNCRouterParts belt reduction system with their 7-Amp NEMA34's, you will have a great machine!
Widgit

I agree. You can also use quite a bit smaller motors. I would do a slave axis as well. This does give a few advantages over Jack shafts or belt/chain syncing. Much faster speeds with R&P and you have the ability to square the gantry by homing it before each part or job. This keeps the gantry dead square.

If the chain/belt sync does have any issues at all with backlash, you can bet that both sides will not be equally effected.

I would seriously look into CNC Router Parts. My Plasma cutter is a joy to use mainly because I decided to go with them for most of the electronics and drive system.

[nokillzone]

what size motors do you guys recommend ,, ..

Where could i find cheap rack and pinion stuff ???

this stuff is heavy .. not yet sure about the bed platform ,, i might have to mill out some of my aluminum from the x axis foot's .. as i don't get allot of travel..

[daniel28]

what size motors do you guys recommend ,, ..

Where could i find cheap rack and pinion stuff ???

Hi. Try to check sears.com. They also cater international shipping.

[nokillzone]

Can you guys give me an idea of good RPM and HIGH Torque from ebay ???
what motors ... or eaven 3 motor package to get ..

this is my 2end cnc i am building ..
1st one kinda winged it this one i have real $$$ invested in this ... i know motors gona cost me $400 - 700 .. range ..

please sugestions ...

[ger21]

Not without knowing a lot more about your machine. Can you answer all the questions I asked before?
Are you using ballscrews, or rack and pinion? The components you use, and how fast you want to go will dictate the choice of motors.

If your budget is $700, then the most powerful setup in that price range would probably be a G540 with 381oz motors and 48V power supply from automation technologies.

[nokillzone]

i am thinking like ...... 3 Axis Nema 34 Stepper Motor 1600 OZ IN Driver CNC KIT | eBay

i have not settled on rack and pinion as i dont know where to buy it and how much it would cost me ..

from ebay .. i found ball-screw


Item: RM2005--1200 mm ball-screw
Quantity: 1
Item: RM2005--2133 mm ball-screw
Quantity: 2
Item: RM2005 ball nut
Quantity: 3
Item: BF15/BK15 end support
Quantity: 3
The total will be $ 486.96
Deliver: free postage by FedEx 7 -- 14 days with tracking number.

but i am interested in rack and pinion as well .... !!!!!!
give me some feedback ...

i do like to solder and can follow diagrams.....

[ger21]

Those motors and those screws are probably the worst commbination you could buy. If you plan on using ballscrews that long, your best bet would be 2525 screws. 2005 screws will whip at higher speeds, and those 1600 oz motors aren't capable of high speeds.

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Look at the CNC ROuter Parts components for rack and pinion.