Dressing Up A Scratched Cylinder Rod???

[Wayne County Hose]

In all the time you spent farting around this morning, you could have driven to the northeast corner of Pa and I could have done this for you. What budget would that come out of?

 

[SPYDERLK]

Actually, your numbers are raising a very good point here: We are talking apples and oranges. It appears you are talking instantaneous max flow (in SCFM I'm assuming) while I am talking average demand. Your numbers are clearly more relevant to hose size, coupling size and Andy's concerns. However, I can't honestly tell you that I know the maximum instantaneous flow specification for my 3/4".

And BTW, my remote accumulator is about two actual cubic feet (ACF) in capacity.
Dougster

IR gives SCFM at load for their 3/4 guns. They range from 25 to 50. I havent seen those figures for the 1/2s. Im guessing 10 to 20. A "big" good 1/2 at full pressure at the port, snaps hard-sometimes quick enuf to overcome the limitations of a twisty setup.
Good luck!
larry

 

[Dougster]

In all the time you spent farting around this morning, you could have driven to the northeast corner of Pa and I could have done this for you. What budget would that come out of?

I'm not sure. Probably either "Travel" or "Entertainment"!

Folks in Boston are allowed today as a "Day of Rest" for staying up late last night and watching (and winning!) the World Series!

Dougster

 

[Wayne County Hose]

Folks in Boston are allowed today as a "Day of Rest" for staying up late last night and watching (and winning!) the World Series!

Dougster

For how often they win, should be a month.

 

[Dougster]

IR gives SCFM at load for their 3/4 guns. They range from 25 to 50. I havent seen those figures for the 1/2s. Im guessing 10 to 20. A "big" good 1/2 at full pressure at the port, snaps hard-sometimes quick enuf to overcome the limitations of a twisty setup.
Good luck!
larry

Trust me Larry... I know from working on the snowplow that my trusty, beloved old 1/2" air wrench is strictly for everyday/automotive uses! The thing is a wonderful antique and owes me absolutely nothing... but when the going gets tough, there is no substitute for hauling out the new 3/4" monster.

Dougster

 

[Dougster]

For how often they win, should be a month.

Yikes!!! Is it Extra Cruel Day today down there in Pennsylvania???

Dougster

 

[john_bud]

but I am still the 33+ year mechanical engineer with an extensive fluid systems design and testing background and about 16 books on the very topic of compressible and non-compressible flow through systems, nozzles and orifices sitting right behind me (although I may need to burn some of them soon to stay warm). The insignificant pressure drop I quoted you was at nearly double the flow my air wrench takes. The actual flow capacity of those "worst case" (i.e., cheap Chinese junk) 1/4" couplings is more than 30 SCFM at 100 PSIG without a crazy substantial pressure drop (i.e., 9 to 10 PSI). For expensive, Parker premium quality couplings, you can go up to an amazing 70 SCFM for that same 9-10 PSI pressure drop. I wouldn't, but you can. Personally, I wouldn't jump up to 3/8" pneumatic couplings until I got to at least 20-25 SCFM. I am at 6.1 SCFM.


Dougster

If you think that 3/4" impact uses 6.1 SCFM - you need to turn in that dusty diploma !!! You are in LA-LA land with that one. Way out it left field and smoking the lawn - ain't no way in the world it's 6.1 when driving a nut or bolt off!!!! It may be at 6.1 at the minimum setting with no load, but start trying to whack a 700 ft-lb bolt and it's a helllck of a lot more.


I can tell you're and engineer 'cuz you don't listen.

jb

 

[Dougster]

If you think that 3/4" impact uses 6.1 SCFM - you need to turn in that dusty diploma !!! You are in LA-LA land with that one. Way out it left field and smoking the lawn - ain't no way in the world it's 6.1 when driving a nut or bolt off!!!! It may be at 6.1 at the minimum setting with no load, but start trying to whack a 700 ft-lb bolt and it's a helllck of a lot more. I can tell you're and engineer 'cuz you don't listen.
jb

Thanks very much for your input JB. I believe I corrected myself above, but maybe you didn't read that far down yet. You are entirely correct that maximum instantaneous flow can be up to several times so-called "average demand" specification. In fact, I'm not even sure how they come up with the "average demand" specification now that I think about it... but thank you for pointing that out again. It is an important distinction and needs to be repeated.

But as true as it is, it really doesn't change a thing. I will use the 3/4" air impact wrench and if that doesn't work, I will buy and use a 1" air impact wrench. End of story (I can only hope).

Once again, thank you for your input.

Dougster

 

[civesnedfield]

Nine days and nearly 100 posts and the thing still ain't fixed yet. Do I need to come over there and fix it for ya.

 

[2manyrocks]

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