[Verfur]

Hey guys,

I am just starting my home made cnc router and I have some massive tkh well used guides given to me from a freind at dealership. the guides are quite heavy and i will need a bit of power to move them with any speed at all. I am looking for somthing in the range of 650 to 1000 in/oz.. I have seen an add on ebay for both stepper motors and drives from Delegrange Technology LLC. drive 4XCNC10A 10 Amp CNC interface and motors they sale
are 650 unipolor and 1050 Bipolor the drives are I belive Unipolor only.
Thought I would ask if any one had dealings with them.

Thanks in advance
John

[Evodyne]

Verfur,

Hi John! I'm personally not familiar with these guys. You may want to post a link. I know Dan Mauch, the proprietor of Camtronics, sells some nice powerful steppers. He's also got a nice enclosure kit designed for the Geckodrives. You may also take a peek at the HomeShopCNC site. I've run one of his 1200 oz-in steppers with a Gecko G-210 and it rocks.

Have fun!

Lance

[Verfur]

Lance,
thanx for the links

here is the link and the motors and drives
WWW.DTLLC.COM

cost is also a major point else it would most likly be geckos.

Thanks John

[ger21]

For motors over 250-300oz-in, you'll find that Geckos will far outperform any of the cheaper drives. And possibly even more expensive ones.

Also, those drives don't have microstepping, so generally won't run as smooth, and you'll need expensive resistors to limit the current when used with higher voltages.
Here's a reply to a similar question.
http://groups.yahoo.com/group/CAD_CA.../message/83197

[Evodyne]

Verfur,

I took a look at their site and the specs. They have a drive that uses external resistors for current limiting vs. a chopper drive that chops the input voltage and thus applies a controlled, varying voltage to the motors. A chopper will usually outperform a non-chopper in terms of speed and additional power (torque). The same is generally true for bipolar vs. unipolar-the bipolar will perform better, all else being equal. This doesn't mean that these fellows have a bad board, just that you can't expect it to perform as well as a good bipolar chopper drive. I thoroughly understand your budget constraints and that Geckos may not fit your plans. 99% of the time I'm in the same boat. Hopefully some guys with experience with this type of drive will add their two cents worth. Good luck!

Lance

[Verfur]

Thanks for the info.

On the micro stepping, if I run a 1.8 deg. step on a .200 per turn ball screw would that not give me .001 res per step on the drives without micro steps? I will most likly use the thomson ball screws with a .004 per inch possible lead error.Please understand this will be the first machine I have built and that it is strickly for wood only. For the model airplane addiction my father and I suffer from. I have use of a full machine shop, cnc lathes and mills, Esprit cad/cam, manual lathe and mills. I do not want to work on metal at home I do it all day at work (I do love it though)

John

[ger21]

Microstepping makes the motors run much smoother, and potentially faster because of the smoothness. That is more important than the increased resolution.
Read this:
http://www.machinedesign.com/ASP/vie...strSite=MDSite