Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 41 users online :: 3 registered, 0 hidden and 38 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

Registered users: Bing [Bot], Google [Bot], Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Pneumatic Clipper

All non-spudgun related discussion goes here such as projects, theories, serious questions, etc. All "off-topic" posts (aka useless posting, determined by moderators) will be removed.
Sponsored 
  • Author
    Message

Pneumatic Clipper

Unread postAuthor: CS » Sun Jul 15, 2012 2:47 pm

One question, how could I make this automatic?

Random, but interesting.
  • 0

Attachments
Image2.jpg
Image3.jpg
Image4.jpg
Last edited by CS on Sun Jul 15, 2012 6:33 pm, edited 1 time in total.
User avatar
CS
Donating Moderator
Donating Moderator
 
Posts: 1897
Joined: Fri Feb 18, 2005 5:32 pm
Location: Southern Utah
Country: United States (us)
Reputation: 4

Unread postAuthor: jackssmirkingrevenge » Sun Jul 15, 2012 4:04 pm

QEV + pop-off pilot?
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: POLAND_SPUD » Sun Jul 15, 2012 7:41 pm

uhmm ever heard of solenoid valves + microcontroler/555 timer/time relay

or read my thread on time delay valves ?
  • 0

Children are the future

unless we stop them now
User avatar
POLAND_SPUD
Chief of Staff
Chief of Staff
 
Posts: 5405
Joined: Sat Oct 13, 2007 4:43 pm
Country: Israel (il)
Reputation: 10

Unread postAuthor: PVC Arsenal 17 » Sun Jul 15, 2012 8:13 pm

POLAND_SPUD wrote:solenoid valves + microcontroler/555 timer/time relay


Second that.
  • 0


PVC Arsenal 17
Major General
Major General
 
Posts: 1762
Joined: Mon Mar 27, 2006 4:18 pm
Location: United States
Reputation: 1

Unread postAuthor: jrrdw » Sun Jul 15, 2012 9:31 pm

What are you up to this time? Oh and hay, whats up?
  • 0

When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6540
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Unread postAuthor: CS » Mon Jul 16, 2012 12:02 am

Electronics are not an option out of principle. "time delay" = end to google searching funk.

This is close: http://www.youtube.com/watch?v=L5IIuhCbNto jsr, I know a system with a qev+pop off is viable, just not sure how to implement it. Switching from a double acting cylinder to a spring return cylinder, etc.

I remeber a circut where adjusting a flow control valve adjusted the speed of reciprocation. I'd like something like that.

This is a prototype for a handheld tool, gonna keep the specifics under wraps until I find out someone else has already built it. Big news I've kicked smoking for a week now, thats about it. Normally not worth mentioning, but hey I've thought about it a few hundred times while working on this project.
  • 0

User avatar
CS
Donating Moderator
Donating Moderator
 
Posts: 1897
Joined: Fri Feb 18, 2005 5:32 pm
Location: Southern Utah
Country: United States (us)
Reputation: 4

Unread postAuthor: jackssmirkingrevenge » Mon Jul 16, 2012 1:08 am

CS wrote:Big news I've kicked smoking for a week now, thats about it. Normally not worth mentioning, but hey I've thought about it a few hundred times while working on this project.


Idle hands ;) keep them busy!

Switching from a double acting cylinder to a spring return cylinder


That would basically be it.

Here's how I modded a QEV for full auto: http://www.spudfiles.com/forums/viewtop ... tml#338215

I remeber a circut where adjusting a flow control valve adjusted the speed of reciprocation. I'd like something like that.


Note how in my example the cyclic rate depends on how fast the air is being fed into the system.

For a double acting cylinder, you would need some sort of shuttle valve in the system.

Image

We have pneumatic diaphragm pumps at work similar to this:

[youtube]http://www.youtube.com/watch?v=AZF3YJzGKCM [/youtube]

Around 1:30 there's some good animation of how it works.
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Sponsored

Sponsor
 


Unread postAuthor: POLAND_SPUD » Mon Jul 16, 2012 8:04 am

time delay valves are air actuated valves. They've got a flow control valve (or just an orfice) to regulate flow of air to the pilot side once the pressure on the pilot side is high enough to overcome stiction, spring force etc. the valve switches to the other position

Here you can see one of them
http://www.esska-tech.co.uk/esska_eng_s ... type_.html

off the shelf time delay valves can be difficlt to get and/or expensive but you can build one with a regular air actuated valve and a flow control valve

ohh here is one I built and tested
http://www.youtube.com/watch?feature=pl ... 5UD8ZPyaMM

As you can see it works ;-) though it didn't offer high enough flow for a fullauto high pressure pneumatic but it was due to the valve size and tubing only
  • 0

Children are the future

unless we stop them now
User avatar
POLAND_SPUD
Chief of Staff
Chief of Staff
 
Posts: 5405
Joined: Sat Oct 13, 2007 4:43 pm
Country: Israel (il)
Reputation: 10

Unread postAuthor: CS » Tue Jul 17, 2012 2:01 am

Went ahead and made a qev+poppet valve setup. My poppet valve is 125psi and my compressor is 100psi, so I Macgyvered an external spring to lower its opening pressure. The bursts of air are to short to get a full extension of the cylinder.

Sound is crux, and the poppet valve exhausting is a problem. Going to stick with my orginal plan and have a exhaust line alongside the air in line. This way the exhausted air is discharged 50 feet away.

I'd like to make a mechanical switch that accomplishes the graph below. Seems simple enough but when I get down to thinking I can't figure out how to press the switch in one direction, but not the other direction.
  • 0

Attachments
airCylinderGraph.png
airCylinderGraph.png (8 KiB) Viewed 810 times
User avatar
CS
Donating Moderator
Donating Moderator
 
Posts: 1897
Joined: Fri Feb 18, 2005 5:32 pm
Location: Southern Utah
Country: United States (us)
Reputation: 4

Unread postAuthor: POLAND_SPUD » Tue Jul 17, 2012 5:42 am

I'd like to make a mechanical switch that accomplishes the graph below. Seems simple enough but when I get down to thinking I can't figure out how to press the switch in one direction, but not the other direction
uhmm you want to use just one switch??

that can be done - though you might have to remove the spring return from the valve to turn it into a a toggle valve
  • 0

Attachments
cs.JPG
cs.JPG (16.47 KiB) Viewed 800 times
Children are the future

unless we stop them now
User avatar
POLAND_SPUD
Chief of Staff
Chief of Staff
 
Posts: 5405
Joined: Sat Oct 13, 2007 4:43 pm
Country: Israel (il)
Reputation: 10

Return to Non-Spudgun Related Discussion

Who is online

Registered users: Bing [Bot], Google [Bot], Yahoo [Bot]

Reputation System ©'