Pneumatic logic for gripper, on - off -on
Pneumatic logic for gripper, on - off -on
(OP)
I have a chuck that holds samples for metrology equipment. It uses a pneumatic gripper (it's actually configured to push the sample into hard stops) to fine position and clamp samples.
We have a problem with the sample drifting after clamping and/or riding up in the chuck while clamping. We've made a number of changes with some success but this issue still happens sometimes.
One thing that has been found to help is to clamp, unclamp, clamp again. The first clamp basically positions it while the second holds it in place while the metrology equipment does its thing.
Trouble is our software people are massively backlogged and so far haven't undertaken to add this as a function to happen automatically.
I'm wondering if I could achieve this with pneumatic logic? The software turns the air/N2 pressure on and the chuck clamps, opens, clamps again and stays clamped till the software turns the pressure off.
I did relatively little logic at school and nothing specifically on pneumatic logic.
1. Does this seem like it's possible.
2. Can anyone point me in a direction where I can learn a little about this and work it out.
I'll probably work with our main pneumatics vendor if it looks promising but I want to have some idea up front. A quick google search turned up some vendor pages and on this site thread404-217222: Timed pneumatic valves? but I was wondering if anyone more knowledgeable could point me to a good source of info.
Thanks,
We have a problem with the sample drifting after clamping and/or riding up in the chuck while clamping. We've made a number of changes with some success but this issue still happens sometimes.
One thing that has been found to help is to clamp, unclamp, clamp again. The first clamp basically positions it while the second holds it in place while the metrology equipment does its thing.
Trouble is our software people are massively backlogged and so far haven't undertaken to add this as a function to happen automatically.
I'm wondering if I could achieve this with pneumatic logic? The software turns the air/N2 pressure on and the chuck clamps, opens, clamps again and stays clamped till the software turns the pressure off.
I did relatively little logic at school and nothing specifically on pneumatic logic.
1. Does this seem like it's possible.
2. Can anyone point me in a direction where I can learn a little about this and work it out.
I'll probably work with our main pneumatics vendor if it looks promising but I want to have some idea up front. A quick google search turned up some vendor pages and on this site thread404-217222: Timed pneumatic valves? but I was wondering if anyone more knowledgeable could point me to a good source of info.
Thanks,
KENAT, probably the least qualified checker you'll ever meet...





RE: Pneumatic logic for gripper, on - off -on
Don
Kansas City
RE: Pneumatic logic for gripper, on - off -on
http://ww
RE: Pneumatic logic for gripper, on - off -on
|
clamp output-->--+------(T1)-|
| |
| T1 |
| +-]/[-+-( )-| clamp
| | T2 | |
| +-] [-+ |
| T1 |
|--] [------------------(T2)-|
| |
| |
H N
Don
Kansas City
RE: Pneumatic logic for gripper, on - off -on
2. Some good resource links here: thread404-217222: Timed pneumatic valves?
RE: Pneumatic logic for gripper, on - off -on
RE: Pneumatic logic for gripper, on - off -on
This Link gives you some control circuits. The penultimate one may be of interest to you.
RE: Pneumatic logic for gripper, on - off -on
Don
Kansas City
RE: Pneumatic logic for gripper, on - off -on
I was out of the office today but I'll look closer on Monday.
I was already thinking about timers so thanks for confirming I may be on the right track.
I think we may have a good SMC rep, that or Festo, it's been a couple of years since I looked at any pneumatics.
Thanks again,
Ken
KENAT, probably the least qualified checker you'll ever meet...
RE: Pneumatic logic for gripper, on - off -on
http://www.hydraulicspneumatics.com/200/eBooks/
Bud Trinkel, Fluid Power Consultant
HYDRA-PNEU CONSULTING
RE: Pneumatic logic for gripper, on - off -on
Essentially 2 Timers in parallel. One that closes a valve after say 'T1' seconds and a second one that opens a valve after 'T1+T2' seconds.
In my case the signal and supply would both be the same source, correct?
Sorry my terminology isn't quite right yet, I'm still reading through the ebook, however I wanted to thank you all for your input, it's answers like these that make this site so usefull.
KENAT, probably the least qualified checker you'll ever meet...
RE: Pneumatic logic for gripper, on - off -on
I've shown the clamp output as a contact point, but actually you would just run the controller output wire directly to the timer terminals as shown.
Maybe this diagram will make more sense:
Don
Kansas City
RE: Pneumatic logic for gripper, on - off -on
Tapping into our electrics/electronics is probably no more of an option than changing the software. The Chuck can be exchanged with at least one other type of chuck, more or less 'invisible' to the rest of the tool. The other chuck just uses the vacuum to hold the sample in place so the on/off/on wouldn't be appropriate. I realize there could be a selector switch but it's starting to get well beyond my competancy.
Really appreciate the input though and I'll suggest it when we get together to discuss the problem.
KENAT, probably the least qualified checker you'll ever meet...