Somewhat related to metalworking

Oct 08, 2013 57 Replies

Depends on the carb, I suspect. The SU carbs for my MGA had dashpots to control how rapidly the venturi throat opened. It allowed it to close quite rapidly.

I don't know at all for that. The only bandsaws which I have experience with either have only step belt speed changes (the infamous "$200.00 horizontal/vertical bandsaw" sometimes sold for a lot less, and the three-wheel Emco one which I have), or the DoAll which we had at work with a variable speed pulley assembly, plus a gearbox to give a high range or a slow range. No dashpots involved in any of those as far as I know.

Mostly -- a dashpot is a cylinder with a very close fitting piston (often glass cylinder and graphite piston) with an adjustable needle valve to control how rapidly it could move. Could have an oil, or air as the medium. Then it is up to who put it in what as to whether it controls valves, limit switches, or whatever else. I could even imagine them being used in some record turntables to avoid rapidly dropping the stylus (needle) onto the record, possibly damaging both.) I've seen at least one model of turntable which has an arc support bar, and a lever which starts it lowering slowly, or lifts it to a safe height and keeps it there.

Enjoy, DoN.

Not sure what you guys are talking about, but a buddy of mine describe a simple slow feed for has bandsaw as an aluminum cylinder and piston with an adjustable bleed valve. He said lots of guys were making them so the full weight of the head wasn't resting on the blade as it fed into the cut. Not sure I got it all, because I haven't seen it, but...

It has been my experience that fully pneumatic systems involving timing are not as reliable as modern electronics in the typical shop environment. The big problem is the need for dry, clean air. So often someone forgets to clean filters or lets water enter the system or some joker puts oil in the air thinking the system needed it. Tiny passages get clogged and so the timing gets messed up and the speeds of cylinder movements changes and so on. Modern electronics need no attention by well meaning machinists and so remain trouble free for decades. I have spent many hours cleaning and adjusting air logic controls on CNC machines. Eric

It is my experience - and I do a LOT of pneumatic controls - that Eric is 100% correct here regarding reliability.

As have I.

Which is why though I certainly respect them for what they are..and what they have done so well in the past...are now largely outdated technology better pushed aside as technology improves.

It was really good tech...but...there is now much better tech available and largely for cheaper prices.

Shrug

"The socialist movement takes great pains to circulate frequently new labels for its ideally constructed state. Each worn-out label is replaced by another which raises hopes of an ultimate solution of the insoluble basic problem of Socialism, until it becomes obvious that nothing has been changed but the name. The most recent slogan is "State Capitalism."[Fascism] It is not commonly realized that this covers nothing more than what used to be called Planned Economy and State Socialism, and that State Capitalism, Planned Economy, and State Socialism diverge only in non-essentials from the "classic" ideal of egalitarian Socialism. - Ludwig von Mises (1922)

Cheers Eric, that makes sense. I come from the electronics end of things so I see all the problems it entails.

I would welcome you to take a tour of my bare bones shop. Garage sales decaying air hoses throughout, but anything better than that, I would have to wait for those morons at Lotto to pick the right numbers.

Six numbers. What is so hard about that? Or is it five? Or seven?

It sure would be fun, though, to have a wad of cash to throw at the problem, and a few grunts to do the work whilst I sampled the nectar of the Gods, and interviewed secretaries for new positions.

No pun intended.

Steve

SteveB fired this volley in news:l3i0nb$q5k$1 @speranza.aioe.org:

Steve, it takes little more cash to do it with small-volume pneumatics than to 'cobble it up' out of odds and ends.... IF your time is worth anything, at all.

And no; "connecting all that tubing" is not time-consuming. It takes almost zero time with push-to-connect fittings; just 'cut and stick'.

Most of what I do for actuators can be handled with either 5/32" or 1/4" tubing. A few large bin shakers or 'power' actuators take larger sizes.

Most of the fittings for either of the small sizes are about the same price, and pretty inexpensive compared to time.

Now, if time is all you have, then that's your resource.

Lloyd

??? You need air hoses? Ive probably got 500 feet of used but perfectly good US made air hoses Ive pulled when I shut down shops in the last few years.

You, and a few others 'round here horde this stuff. Friends share! :)

Seriosuly though, you guys who have all this surplus stuff also obviously have space! Here, and where I live are some of the most rural places in NJ where hot air balloons land on the lawns and fields and horses often break free and need chasing... And yet we still don't have nearly enough storage space for that kind of hording...er... Collection.

I was offering up air hose.

I too am very limited on space. Ill clean it out..and fill it back up within a very short amount of time.

My front yard now has (4) sailboats on it. The biggest being almost 26 feet long. The next shortest...21 feet long, is nearing the end of its restoration. Ill finish painting the inside fo the cabin today and then there will only be a couple minor things to do and I can probably sail it this weekend.

Id love to have a full acre of fenced (dogs) land. Life would be eversomuch simpler

Gunner

If I hit the Lotto I'll buy out your neighbors' land for you so you can hoard more stuff! I like hoarding stuff too, it all too often comes in handy!

But only if you know where it is.

i

Specificly..or generally...?

(Grin)

Gunner

Does it count when I know generally which pile its in?

Gunner Asch on Tue, 15 Oct 2013 21:12:57 -0700 typed in rec.crafts.metalworking the following:

Sort of. If you have time to unearth it, then it counts. If not ..., not.

-- pyotr filipivich "With Age comes Wisdom. Although more often, Age travels alone."

[snippage]

I'm not hoarding. I'm stockpiling or salvaging. "I keep supplies on hand. You stockpile. They hoard." Besides, never know when you might need on of them, whatever they are. Or could re-purpose that collection of widgets. Hmm, maybe if I grab a hack saw, I can not only cut those window frames loose, but salvage the glass as well... Then I could use them and some of the boards to make a cold frame for the garden.

I was late to class Monday because just down from where I parked, were three screens. Very nice screen, wooden frames, well made, about two foot by a foot and a half. Just sitting beside the garbage can. "Who knows".

-- pyotr filipivich "With Age comes Wisdom. Although more often, Age travels alone."

We should coordinate, write a new book, and call it:

_The Organized Hoarder_.

It could be on shelves soon and would certainly be a best seller!

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