In a Google search bar, type "21 kg/cm to oz/in" and tell me what you get.
However, if I go to http://www.onlineconversion.com/torque.htm and input 21 kiligram centimeters, converting to ounce inches, I get "21 kilogram centimeter = 291.635 117 69 ounce inch"

My bad.

 

Dorsal,

I didn't know you could do that with google. Guess the google calcutator takes the units literally. Probably why I never saw this, when I've done the search in the past. I couldn't get the standard dash or dot to work, but these do:
21 kg*cm to oz*in
21 kg cm to oz in

-Kwok

 

I can probably use 6-7 of these motors. So I went ahead and ordered 10, to get the bulk pricing. What a bargain, $11 for each shipped.

Be sure to check out their outer stuff, too. I bought the 24v 6A power supply for $15, also. And picked up a parallel and video cable; and a few other misc items.

-Kwok

 

Well, I just bought 5 of them, and 10 of their NC/NO limit switches.

 

Just got mine in today. Nice little motor. Anybody see how much these are going for on other sites?. Wow what a spread of prices.

 

Just installed the new stepper motor. I am at 30ips on the Z axis. amazing what 13 bucks will do.

 

Bump up the Vref to 1.4V. I am getting 42ipm, you should be able to get that as well.

 

Thanks Flash and everyone else for posting about these steppers. I ordered two Vexta PK266-02A last night from MJPA for both my Z and Y axis. My question to you Flash is if you are using the 1/4-20 all thread on your Z axis or if you converted to something different like ACME thread?

Here are my current velocities and drive setups:
X: Stock Stepper, Stock Belt and Pulley, 45 ipm (could go higher)
Y: Stock Stepper, ACME 3/8-12 carbon steel drive nut, 28 ipm
Z: Stock Stepper, Stock 1/4-20 All Thread and t-nut, 12 ipm

I am hoping to get something like this with the two new steppers:
X: Stock Stepper, Stock Belt and Pulley, 45 ipm
Y: Vexta PK266-02A Stepper, ACME 3/8-12 carbon steel drive nut, 45 ipm
Z: Vexta PK266-02A Stepper, 1/4-20 All Thread and t-nut , 45 ipm

Maybe I'll have to convert to ACME 3/8-12 on the Z to get 45 ipm, but I'll try the 1/4-20 stock setup first to see how it works.

 

My X and Y axis are running 282 oz/in steppers with the MK1.5 Belt drive mod. The Z axis was the only slow axis left on my PP and I wanted to stay within the NEMA 23 small stepper footprint, so this stepper fit the bill perfectly.

The Z axis is running the standard 1/4 20 threaded rod with the rubber hose connector.

 

So far, this stepper motor is doing a fantastic job. No issues whatsoever so far.

I also replaced the HP power supply with a larger capacity one from MPJA since I am running the 282 oz/in steppers on my X and Y axis. This one even has a built in cooling fan.

 

I tried to find it this morning and it seems they have changed the line of power supplies since I bought mine. At least I don't recognize the packaging as looking like mine. It was around $24 and was a 12.5A supply.

I had purchased one and it came with no label or documentation so MPJA sent me a replacement and told me to do what ever I wanted with the first one, so I sold it to Dorsal. The only thing wrong was the label was missing which showed which terminal blocks were input and which were output.

 

Is this the 12.5A PS? http://www.mpja.com/prodinfo.asp?number=17429+PS

I ordered 2 PS, this one and the 6.5A one (same one Crash got). My stuff should be here tomorrow.

-Kwok

 

Yep, that's it.

 

Got my stuff yesterday. Here is a picture of the motors. I put one of the original steppers in there for a size comparison. The new ones are a hair shorter. Another thing I noticed is the screw holes looks a tiny bit small. A #10 screw will go part way throught, but not all the way. The holes are 10/1000 " smaller than the originals. It's easy enough to fix.

Attached files

 

Unfortunately, there is no material, at all, for tapping threads. It's basically a press fit, both the hole and the #10 screw are exactly 0.185" diameter. 0.196" diameter would be the correct clearance hole, which is what the stock stepper holes are.

I ordered Monday am, before they were even opened. They didn't ship out until wed. I should have gotten it in 3 days after that, but it was a Sat. So I didn't get it until Monday, a full week. You should get a ups tracking # when they ship. Then, for you, it's 4 days to ship ups ground to Texas.

-Kwok

 

It looks like there's plenty of material there to tap the holes to 1/4-20, like I did to my stock motors.
I'm still waiting for mine - I paid the order on 5/4, got shipping info on 5/6 and UPS says they'll deliver on 5/13. Oh wait, that's tomorrow!

 

My two Vexta PK266-02A steppers from MJPA were just delivered. I will probably install them soon and test them out on my Z and Y axis. I am hoping to get a least 40ipm on the Z axis with the stock 1/4-20 rod. It will be interesting to see what kind of speed I end up getting with the modified ACME 3/8-12 rod that I have already installed on the Y axis, once again I am hoping for at least 40ipm on that axis also.