stepper motor complete kit advice

[chip]

evening all i need some help here,i had planned to make a start on my first cnc router january gone but got roped in to other jobs.
but now im compileing a list of things to get my problem is very limited knowledge,i know its going to be a struggle im hopeing i can wing it. and learn as i go
my machines going to have fourth axis which is an old lathe i,ll marry up which i purchased today.
i want advice on the kit in the link below with my limited knowledge i feel its best to buy as much as i can in kit form!
can you tell me if this is good for the money id prefer to buy in the uk if i can but so far the prices with all the vat slapped on have been way over what i want to pay.thanks.
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=180487757960&ssPageName=STRK:MEWAX:IT

[irving2008]

those are some big steppers... what are you planing to drive with them? big isnt always best... steppers and drives need to be matched to the job in hand...

[John S]

Rubbish, what a mis matched set !!
200 watts at 24 volts to run those motors, might as well use 4 D flashlight cells.

.

[chip]

thanks for the replys this is the link i should have put up but couldnt find it again,it gives me the options for 4 axis power extra motor ect
maybe this would be more suited although i would really like to buy in the uk.
on the size of the steppers i was a little paraniod about weak motors lol i was set on a fair sized machine .
http://cgi.ebay.co.uk/Cnc-Mill-3-axis-Control-Kit-NEMA34-step-motor-40kg-cm_W0QQitemZ390172701757QQcmdZViewItemQQptZLH_Defa ultDomain_0?hash=item5ad81af43d

[HiltonSteve]

Just casting my eye over what you are after and if you want to buy from the UK then I have come up with the following options -

Stepper motors - Arc Euro - http://www.arceurotrade.co.uk/Catalogue/Stepper-Motors/Stepper-Drivers - (http://www.arceurotrade.co.uk/Catalogue/Stepper-Motors/Stepper-Drivers)
Arc code - 160-010-00450
Price - £34.95

Stepper drivers 4.2A - Arc Euro - http://www.arceurotrade.co.uk/Catalogue/Stepper-Motors/Stepper-Drivers
Arc code - 160-020-00101
Price - £42.50

Power supply (36V) - DIY CNC - http://www.diycnc.co.uk/html/power.html
Price - £50

Break out board - DIY CNC - http://www.diycnc.co.uk/html/uniport.html
Uniport V2
Price - £39

Total equivalent cost - £321.35

Similar spec steppers, better spec drivers (steps per rev), 36V Power Supply and a nice tried and tested break out board. Arc Euro are in Leicester which is a bit closer than China!

I think the above will be a better solution for you and you can buy it all in the UK,but thats just my opinion!!

[chip]

thats outstanding steve thanks very much,great help

[Gary]

36V is too low voltage to run nema 34 motors, you will not be able to get them running at any usefull speeds.
What size machine are you making?
what cutting and rapid speeds do you need?
What are you using for your linear motion ? Ballscrew, leadscrew, rack or belt.
These are all the questions you should think about before splashing out money on motors and drivers.
Also do you need support? or are you happy doing it all yourself?

[chip]

hello gary thanks for the reply yes i,m going to need all the help i can get.
my problem is i cant afford everything in one hit so thought id work on getting the electrical components out of the way first then make a start on the mechanical parts.
my plan was to use ball screws from your place aswell as supported rail all round,
the size of the machine i had in mind is around the 4x4"-ish mark then a lathe ive just purchased that will be converted to a 4th axis to be mounted to one side of the table..just for turning wood
speaking to a lad a while back on using nema 34,s it was his guess id want 20mm dia ballscrews if i have that right.
now go easy on me lads most of the terminoligy,calculations charts are over my head.
hence my thinking go for that big motor kit and it,ll cope with any size machine i end up with.
theres a link to a machine id like to model it on its all steel and being a welder i can at least get the steel work right:)
http://www.youtube.com/watch?v=JpzB3m-eYRk&feature=related
and
http://www.youtube.com/profile?user=Andr3wengineer#p/u/2/Kc2b0RaQ_qg

[Gary]

Hi Chip,
If you are happy moving at a slow pace, then you can use a lower voltage, but as soon as you try and go faster, you are risking it stalling or missing steps.
Running a nema 34 frame motor at 36V is a total waste of money and in reality you would most likely see better performance with the Sy60 (nema 23 - 3Nm motor) running at 70V.
over a nema 34 motor running at a voltage under 40V.
you may get away with it on a small mill for the Z axis like the X3, but on large router no..

Missing steps can be expensive as it can make your work useless and you may not pick up on it till it is too late.
For a machine of this size and considering you are spending quite a bit of money on it, you may as well get it working at a pace that will not send you to sleep.
If would say a minimum of 70V going to the drivers, or if you want it to move even quicker, you can use a high voltage driver like our 2M2280N
With this driver you can expect over twice the speed than if you were using 70V.
Infact using the 2M2280N works out a better value product than the 2M880N and a 70V power supply.
Hope that helps.

[chip]

thanks for the reply gary im a little closer to earth for reading that lol, after an oversight yesterday regarding the 36v power supply as it is for 4axis it was suggested i might use two of them..
so will i still have an issue with missing steps poor speed?
i agree with what your saying about spending a lot and skimping in other area,s and i dont want anything to let the machine down so due to a budget im going to have to rethink/maybe even down size a little.
thanks again gary

[Gary]

There is no need to downsize the machine becasue of the motors and drivers, you jsut need to select the right motors and drivers, and going to a higher voltage will not double to the price.
Also you dont need a large motor for the Z axis, so you can save some money there as well.