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Author Topic: Conect 121 cnc retrofit  (Read 18255 times)

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Offline Hood

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Re: Conect 121 cnc retrofit
« Reply #10 on: February 09, 2015, 02:48:44 PM »
I could only find info on one of the motors, cant recall which one but I may still have the info. If you could tell me the make of the stepper I can do a search of my drive to see if I can find it.

The X is 2.5mm pitch and Z is 5mm.

All you need it to put the pulse to an input and set it up as the Index Signal in Ports and Pins/ Inputs.

You will probably have to go a bit bigger on the dia of the slotted disc for best results, most go for 100mm dia  with a 10mm wide slot. You could keep the smaller dia but with a 10mm wide slot it may not provide such a clean signal at higher RPM as the time between on/off states will be quite small.

I would suggest an Optek OPB 916B or 917B and you will also need a 220 Ohm resistor, but that should cost only about £10 for both incl the post.

Hood
Re: Conect 121 cnc retrofit
« Reply #11 on: February 09, 2015, 04:43:56 PM »

You will probably have to go a bit bigger on the dia of the slotted disc for best results, most go for 100mm dia  with a 10mm wide slot. You could keep the smaller dia but with a 10mm wide slot it may not provide such a clean signal at higher RPM as the time between on/off states will be quite small.

Hood

I hate to question the master, but here goes ....
This looks a bit backwards.
At a given rpm, a 10mm slot on a 50mm dia. will be open for a longer duration than the same slot at 100mm dia. By 2:1 by rough calculation.
Am I wrong ?
Russ
Re: Conect 121 cnc retrofit
« Reply #12 on: February 09, 2015, 05:11:12 PM »
Thanks hood, shal look into that setup.

The motor I have is a EGE, sigma 20-3424d200-f1.8

There is nothing on the other one, can't find a wiring diagram anywhere for the larger motor.  There are 8 wires total.  there are 4 white wires with tracers.  These are separated into two groups.  Also 4 individual wires, Yellow red orange and black.
 
Always learning, it's never ending!

Offline Hood

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Re: Conect 121 cnc retrofit
« Reply #13 on: February 09, 2015, 05:12:02 PM »
Not sure Russ, way I see it is the slot is 10mm wide so no matter the dia of the disc the width of the slot will be the same and thus the distance the same no matter the rpm.
The difference would be that on a larger dia disc the closed sweep would be much larger in proportion to the slot than it would be on a smaller dia disc.
Then again I suppose the time would be the same.

So to summarise, F'd if I know :)

Hood

Offline Hood

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Re: Conect 121 cnc retrofit
« Reply #14 on: February 09, 2015, 05:14:00 PM »
Name doesnt sound familiar so possibly mine had different motors, I will have a search and see if I can find it.

Maybe MC will have an idea,  think he kept the stepper, then again it was the newer version so maybe different.

Hood

Offline Hood

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Re: Conect 121 cnc retrofit
« Reply #15 on: February 09, 2015, 05:34:06 PM »
Ok found the pdf I had, not sure which one it is for but have attached it anyway.
Hood
Re: Conect 121 cnc retrofit
« Reply #16 on: February 09, 2015, 06:06:48 PM »
Ok going by that pdf (thanks hood!) the current motors are wired exactly the same as the unipolar setup.  Based on this im happy to give them a go in bipolar
Always learning, it's never ending!
Re: Conect 121 cnc retrofit
« Reply #17 on: February 09, 2015, 06:09:20 PM »


So to summarise, F'd if I know :)

Hood


:D
An angled slot would be the same duration regardless of diameter.
For a given rpm, the parallel slot would have a longer duration as the diameter gets smaller.

Offline RICH

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Re: Conect 121 cnc retrofit
« Reply #18 on: February 09, 2015, 06:59:01 PM »
Hmm ....slot width......
From my rusty memory! :D

Even if calculated and dim used ....sometimes didn't cover rpm range ...so made it bigger
In fact made some about 1/4 the size of the circumference and worked fine.

A CD Rom painted black work nice and saves some time in making it. ::)

FWIW,
RICH
Re: Conect 121 cnc retrofit
« Reply #19 on: February 10, 2015, 03:45:22 AM »
If the cd idea works it will save me some time! 

Does anyone have a diagram showing how to wire kb dc  controller board to a bob.  I think there needs to be some sort of isolating circuit but I have no idea..  Still learning.

Always learning, it's never ending!