Hello Guest it is October 21, 2019, 10:07:48 PM

Author Topic: Electro-Punch design  (Read 11597 times)

0 Members and 1 Guest are viewing this topic.

Re: Electro-Punch design
« Reply #20 on: January 22, 2016, 02:13:38 PM »
One thing I like about the spring fired design is near perfect repeat-ability regardless of fluctuations in supplied air pressure and volume.
Russ
 :)

Online BR549

*
  •  6,902 6,902
    • View Profile
Re: Electro-Punch design
« Reply #21 on: January 22, 2016, 03:53:05 PM »
The one thing you will HATE about it is the heavy spring and the wear and tear on the trigger/sear  then getting premature firing of teh weight. Been there many times. That spring plus the weight of the hammer will put a very heavy load on the trigger/sear surface contact areas.

Just add in an accumilator tank at the cylinder for air that way the volume is constant at teh hammer location. IF your pressure is dropping out of spec you have other problems (;-) You could simply add in a booster  at the hammer location to make SURE the tank is topped off pressure wise each time it cycles.  It should run many many thousands of cycles without fail.

IF the Pincher method works for you( bolt cutter style) I would consider a traveling Hydraulic unit or Air  unit and forget teh hammer.

(;-) TP

Re: Electro-Punch design
« Reply #22 on: January 22, 2016, 06:19:02 PM »


Just add in an accumilator tank at the cylinder for air that way the volume is constant at teh hammer location. IF your pressure is dropping out of spec you have other problems (;-) You could simply add in a booster  at the hammer location to make SURE the tank is topped off pressure wise each time it cycles.  It should run many many thousands of cycles without fail.

 

(;-) TP



That's just how the airbag deal at the lighting plant worked. Just a large bore 3 way sol. valve.
Yep ... might just look into that further.
A bit less complex than the spring deal too.


Thanks
 :)

Online BR549

*
  •  6,902 6,902
    • View Profile
Re: Electro-Punch design
« Reply #23 on: January 22, 2016, 07:08:30 PM »
This one MIGHT do the job (;-) .

(;-) TP
Re: Electro-Punch design
« Reply #24 on: January 22, 2016, 08:11:57 PM »
 ;D

Offline stirling

*
  • *
  •  2,188 2,188
  • UK
    • View Profile
    • www.razordance.co.uk
Re: Electro-Punch design
« Reply #25 on: January 23, 2016, 06:12:43 AM »
Hey Russ

Just playing with some ideas - can I just check some figures please?

@ 150 FPM, it will only traverse .250" in 100 ms.

If my maths is good, one of these is wrong I think. 150 INCHES/min would be .25 in 100ms. 150 FEET/min would be 3inches in 100ms.

out of interest what diameter/material wire/tube are you wanting to cut?
Re: Electro-Punch design
« Reply #26 on: January 23, 2016, 09:50:00 AM »
Hi Ian,
 Yep, your math is far more gooder than mine.  :)
All the more reason to keep the engagement part of the cycle as short as possible.
The electro, or air acting directly on the cut might be closer to 10 ms getting us back to near 1/4" @ 150 FPM. (I hope  ::) )

I don't know how to figgure or estimate the vel, of the hammer, but the material is .25" dia max (for now).
So the "time in matl" would be derived from that.

The toughest to cut is a copper/nickel alloy tube ... .25" OD.

Thanks Ian, much appreciated,
Russ
 :)

Online BR549

*
  •  6,902 6,902
    • View Profile
Re: Electro-Punch design
« Reply #27 on: January 23, 2016, 12:41:13 PM »
Far more gooder, NOW that is a term I can understand.

(;-) TP

Offline stirling

*
  • *
  •  2,188 2,188
  • UK
    • View Profile
    • www.razordance.co.uk
Re: Electro-Punch design
« Reply #28 on: January 25, 2016, 11:06:38 AM »
Hey Russ - how about something like this?

Offline Chaoticone

*
  • *
  •  5,607 5,607
  • Precision Chaos
    • View Profile
Re: Electro-Punch design
« Reply #29 on: January 25, 2016, 11:48:53 AM »
Nice Ian!
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!