Rotary table indexer

I'd be interested........too bad the pinout is wrong.

Hi, apologies for coming late to this - for some reason I no longer get alerts when someone posts on this thread.


With re bug 1.
I'm not completely sure what you mean.
However, I'll explain how it works, if this doesn't agree with what you've found let me know and I'll have a look.

With a 90:1 ratio and a half stepping motor, the minimum the motor can step is 0.01 deg. Therefore pressing the 0.01 jog button will always move 0.01 deg.

With a 60:1 ratio, each step is 0.015 degrees. The device can no longer step in 0.01 deg steps, so it defaults to stepping one step - hence the 0.015deg steps.
Obviously there is no fix for this - however if you have a microstepping driver you may want to use that and change the ratio to compensate.

Bug 2. Agreed, it shouldn't store the sense. I'll look into that.


In program mode there are two commands to do with sense and acknowledge.
First is 'wait for sense' which obviously just sits and waits for the sense line to change.
Second is 'acknowledge' which sets the acknowlege line. These two commands would normally be used in pairs to provide the correct handshaking.

Their main purpose is to link two units together (a friend of mine built a automatic clock gear/pinion cutting machine using a pair).
However they can be used with a PLC for production automation or any system where some other control system can manipulate the control lines.

Hope this helps.
Steve.

Quote:

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Originally Posted by dpaulson

A couple of bugs I found.

1. The ratio. Setting the ratio to 60 and then jogging +0.01 the display says 0.015. It seems that it is using the 90 that is stored in the 'system default'. for the pulses to move while the display is using the user selected 60 to calculate the amount moved. This happens with several different values, but if it is a multiple of 90, it seems to work right.

2. If you ground the sense pin twice, it will store the second 'click' and execute the wait for sense again. I think any 'click' should be disguarded and only accept one 'click' when on waiting for sense.

How does the acknowledge work in the program mode?

Overall, this is a very cool device.

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Can you not just mount the LCD on the other (i.e. component) side of the board?

Quote:

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Originally Posted by dpaulson

I had some circuit boards made up. They are about 4 x 3 in size. The only problem is that the display pinout is flipped, so you need to use wires to connect the lcd instead of the nice though pins that kwackers shows in his assembly. I have about 8 left. My cost was 30.00 CAD ea. Anyone who wants one, I can send cost + postage.


David

Just send me a PM or email to [email protected] as not to contaminate this thread.

Thanks

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Just to re-iterate, none of the components are critical and all should be easily obtainable.

When selecting components the only thing to concern yourself with is the physical size - if you can squeeze it onto the board it'll be fine.

The only component to be careful of is the 18F452, these are available in a number of different packages. Make sure you buy the 40 pin DIP (look at the internal photo if you're unsure what it should look like).

Quote:

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Originally Posted by kmcwhq

I sent the parts list to Mouser, Alllied, Newark, Digikey and MCM.
ALL of them told me I needed to provide Catalog Part Numbers in order for them to quote and/or fill an order. Is it unreasonable to think these inside sales people at these companies should be able to look up their own part numbers in their own companies data base and provide ME with their catalog numbers? Or is this another case of lazy people that don't really want to work for their pay? I thought their -job- is to quote price and delivery on component lists and cross component part numbers to catalog numbers! My job is to give them my money so they can get a paycheck at the end of the week.....not spend an hour with my nose in their catalogs.....

rant off

IF someone has or develops a list of part numbers from one of the USA electronics supply houses, would you consider sharing it with me or perhaps in this thread for the benefit of all....??

Thank you
Dan K

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Quote:

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Originally Posted by kwackers

With bug 1.
I'm not completely sure what you mean.
However, I'll explain how it works, if this doesn't agree with what you've found let me know and I'll have a look.

With a 90:1 ratio and a half stepping motor, the minimum the motor can step is 0.01 deg. Therefore pressing the 0.01 jog button will always move 0.01 deg.

With a 60:1 ratio, each step is 0.015 degrees. The device can no longer step in 0.01 deg steps, so it defaults to stepping one step - hence the 0.015deg steps.
Obviously there is no fix for this - however if you have a microstepping driver you may want to use that and change the ratio to compensate.


Hope this helps.
Steve.

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Yes of course, you are absolutely correct. I was just playing with the controller on the desk, and getting familiar with the programing when I came across this and never gave it much thought, at least not in the right direction, as to why this was happening.

Thanks again.

Thanks Steve (kwackers),

I supplied the 5V DC required for the “Rotary Table Divider” circuit from the step motor driver card. And I did not use limit/control and sensor parts. Besides, in order to be able to make the circuit board smaller, I pulled the unused legs of the microchip out of the socket of the microchip. (See: Pht2). I also did not use 10K VR1. I connected the contrast leg of the LCD directly to the ground. The system the photos of which are attached works very well. Once again, thanks a lot for your efforts and contributions, Steve.

Best regards,

Erginer, from Turkey

I did

Jog CCW mode not working correctly. Press any keys for the CCW and goes 0.1 CW

software http://www.cnczone.com/forums/showpo...6&postcount=67

Fix :)

short-circuit limit2 with GND

Tanks

Quote:

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Originally Posted by elforum

Fix :)

short-circuit limit2 with GND

Tanks

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Hmmm, that's a 'feature'...

The short circuit you had will make it think it can't turn CCW, however once the attempt to move is complete it will then rotate CW to 'backlash' compensate which is OK because movement CW is allowed.

I think correct operation is if it stopped because of the limit switch it shouldn't backlash compensate.

I'll make a note of that...


As an aside, thanks to people for posting pics of their versions of the hardware - it's nice to see people are using my controller! And all over the world too!

Thanks a lot

It is a very useful tool. I put the pictures and after you finish

Have a nice day

Thank you Mr. kwackers
A picture is worth a thousand words.

nyce keypad :)