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Old 12th March 2009, 12:25 AM   #41
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Quote:
Originally posted by woodturner-fran
Can you guys tell me what youa re doing with your pumps - do you leave them on 24/7 or only turn them on when you are going to listen?


I put mine in the next room under the couch, which is about 6 ft of tubing. I turn it on as needed with one of those foot petals used to turn on the xmas tree :-)

I do hear some noise when I don't close the door. I think I may stick it in a box with fiberglass insulation.

Quote:
I have done some more work on this tonight and have most of the arm wand and lift done. the pumps are a bit noisier than expected so also need to do some work on them too. Really its just some wiring to go and then I should be ready to mount it on the TT.
Fran
I'm part way through a terminator style arm, so I interested in your trials and tribulations. By the way, given your moniker, I wonder if you had thought of turning an arm? I have some thoughts on this; but not enough to put into words...


jkeny: thanks for the word of the day 'gobshite'. I like getting closer to my Irish roots in ways my parents wouldn't have taught me :-)
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Old 12th March 2009, 12:35 AM   #42
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Thanks staggerlee. Will investigate some foam I think...

Yes, I did think of a wooden armwand - but for now at least I've used some carbon fibre just cos its handy and what the termiantor maker uses! The pivot is made from lignum vitae though (and as yet unfinished).

I would say low cost project, but high man hours. Each part is cheap, but you need to be pretty pernickity about getting each part fitting just right. EG the carriage on mine works better when facing one way compared to the other!


Fran
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Old 12th March 2009, 12:52 AM   #43
jkeny is offline jkeny  Ireland
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Staggerlee
Ah, yes gobshite, literally translated into somebody who is talkingshite. The best thing about Irish terms of abuse is that they don't get picked up by the automated swear filter.

If I had found that little gutter-snipe that had fired the arrow I would have made sure that the shitehawk never did it again!
(There's another two terms to add to your vocabulary)!!
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Old 12th March 2009, 09:43 PM   #44
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attention all non-gobshites



Things moved on again.... I'm just at the stage of mounting her up on the TT and getting a cart fitted. Arm lift now sorted, pivots cleaned up and best of all, I think I will get away with just using one pump which would make things a little quieter. Those things are damned noisy and no matter what kind of foam etc I surrounded them with, the hum was just as loud. It was like black magic... put it in a foam surround and it was just as loud. Anyways, hopefully with just one pump and putting it behind a sofa it will be low enough to be non-annoying.

the all important pics:

Click the image to open in full size.

Click the image to open in full size.


Hopefully it will all be ok. Now I'm worried I cut the CF arm a bit short, but hopefully it will be ok.

**************************

Now, the questions:

1. Counterweight: Am I better having a bigger weight right close to the pivot point or am I better having a lighter weight further back?

2. Pivot points: How should these be positioned? Should the pivots be level with the stylus or is a little up or down ok?

3. Arm wand lenght: Could someone give me a measurement from the end of their arm wand (ie spindle) to the manifold front edge?




Many thanks!

Fran
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Old 12th March 2009, 09:54 PM   #45
Nanook is offline Nanook  Canada
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Default woodturner...

no specifics for your arm, but a means to quiet the pump.

A friend had an ETII arm several years back he put the pump on a small inner tube and put that in a box, with no top, Go buy some tubing,,10' or so, and put the pump/box 10' away

stew
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Old 12th March 2009, 10:12 PM   #46
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Thanks stew: I have 10m (ie 10 yds) of tubing so I can put it far away. The small bicycle tube is a great idea.

thanks!

fran
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Old 14th March 2009, 01:35 PM   #47
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Got the arm mounted up last night. Took a lot of tweaking to get it sounding pretty ok, but I think there is more to get out of it yet. I need to go bakc and level everything now again and get it all set correctly.

Yes, it is very sensitive to set up. 2 pumps sound better than one. Parallel to platter and both level is vey important. Sonics are good.


Noise part solution: i put both pumps in a small flight case surrounded by foam down at the back of the sofa. I can still hear it, its still annoying, but is better than it was. The only solution to this is to put the pumps further away. I need to try Stews thing with the tube as well.


More later and hopefully pics!

Fran
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Old 15th March 2009, 02:12 AM   #48
Geosto is offline Geosto  Netherlands
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Hi Fran nice project that your making.

I'm thinking to make an terminator style arm myself.
Bud i have been wondering did you or anyone else have done some experiments with different sizes of angle?
I see that you are using 25mm angle bud why not 30mm?
A bigger surface crates more lift and more stability.
As a result you need a lower pressure.

Is this thinking just to simple or is it getting to big?

Regards George
Please excuse me for my terrible English bud it is not my native language.
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Old 15th March 2009, 11:02 AM   #49
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Hi Geosto,

I don't know the answer but I suspect its a number of things. The 25mm works and its widely available pretty cheap. The bigger you go, yes, the bigger the whole thing gets and the heavier the carriage gets too. From reading the terminator site, much seems to be made of the fact that the arm has a low mass. I made my carrier from wood rather than alu just to keep the mass down.

As regards pressure, the aquarium pumps I use are just 1.75psi - and you can bet that its probably even less than that (I'm just going by what it says on the outside of the box). But the tradeoff for using low pressure is that you need more airflow I think. Higher pressure means more hiss at the arm itself (I have none)and likely more compressor noise.


The biggest drawback of this arm is the noise of the pumps. I think that the first thing you should do if you are thinking of making one of these arms is to figure out a way to mount the pumps in another room far enough away so that you won;t hear them. I listen mainly late at night after everyone else is in bed, the house is quiet and they are quite audible.

My 2c!

Fran
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Old 15th March 2009, 05:11 PM   #50
Nanook is offline Nanook  Canada
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Default Noise redux...an idea...

woodturner-fran, if all else fails:

while reading the last couple of responses in this thread an idea "struck" me...what about active noise reduction? Small T amps are available quite cheaply (or even an old unused amp of any sort), a microphone and a small speaker. Mount the speaker in the same box as the pump(s) and wire it out of phase...or make a recording of it and play it through an mp3 player to an amp , and wire it out of phase.

As the sounds these pumps make are very periodic in nature, this should prove effective, without straining almost any amp or speaker.

Dumb simple, but should be effective.


stew
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