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Rudi , question -----

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countershaft
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Rudi , question -----

Postby countershaft » Tue Feb 07, 2006 4:22 pm

on the sand blaster of yours, two quick questions , 1) why the 2 size hoses , 2) why did you move the hole in the bucket from the side to the bottom ? thanks bryson
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Rudi
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Postby Rudi » Tue Feb 07, 2006 6:25 pm

Bryson:

1) why the 2 size hoses


As is mentioned in the article, the 1/2" is the media supply hose, and the 1/4" is the make-up air hose to ensure the siphon feed works properly. At least that is what is there.. I am going to the shop in a minute, and I will try to dig it out of the shed and check to make sure.... it has been almost 2 years since I made it, and my mind ain't what it used to be... :oops: :roll: :shock: :lol: :lol:


2) why did you move the hole in the bucket from the side to the bottom ?


Answer to that is simple... front feed I ended up not getting enough media to transit the hose correctly. Once I changed it to the centre of the bottom of the pail, then it transited correctly, in other words, gravity did what it was supposed to do.. seems even though it looked like it would work, it just didn't... which did two things -- a - it irritated me that I was dumb enough to make the mistake, b - it taught me that I wasn't as smart as I thought, and still needed some edumacation... :roll: :lol:

Hope that helps clear it up or did I muddy the situation worse.....
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Rudi,

Postby countershaft » Tue Feb 07, 2006 6:53 pm

I don't understand where the 1/4 " make-up air hose goes ? What it's hooked to. ? Isn't the system gravity feed ? Whats the siphon feed process? thanks
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Postby Rudi » Tue Feb 07, 2006 10:38 pm

Bryson:

Yup, the system is gravity fed. But air is used to suck it up and expel it thru the nozzle... and a make-up air source is needed. I do not understand the physics of it well enough to understand, but suffice to say that it doesn't work so good without it.

And now I understand why there is confusion...

I think I might have goofed in the pics and the part list.

I went down to the shed tonight and checked on the sandblaster. Underneath the sandblaster when I relocated the elbow to the bottom, I also had to change the fitting.

I guess it is a -T-fitting now.. I will have to take it apart to check and I will take a pic to clarify.....

God, now I am embarrassed.. :oops: :oops: :oops: .. I should have noticed that when I put the presentation together....

Darn...

Just by feeling my way around, there seems to be a t-fitting. One side of the T if the barb fitting that feeds media into the 1/2"hose leading to the gun. On the other side of the T, is the barb fitting that goes to the 1/4" make-up hose. Gee, I feel stupid...... making a mistake like that.. oh well.. I will try to take a pic tomorrow to clear it up..

And it works so well toooo!
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Postby DuxburyFarmall » Wed Feb 08, 2006 9:46 am

Ah Physics where would we be without it. :)

I read the article but I do not understand where is the Makeup aitr connected to? Is it the gun or somewhere else?

Great article Rudi.

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Postby Rudi » Wed Feb 08, 2006 10:31 am

Chad:

If my fingers tell the correct story.. workin blind on that one last night.. the elbow was changed to a T-fitting ot overcome the clog or lack of suction when only the elbow was used.

I am not sure why, I have to look at it, but it is in line with the 1/2" hose... basically I think to relieve back pressure by providing some air or is it not so much make up air as relief pressure????

I will look today and take pics.. will post later this evening I hope
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Guess

Postby allenlook » Wed Feb 08, 2006 12:01 pm

Here's my guess. The high pressure hose from your compressor hooks to the handle of the gun somewhere that the pictures don't show, and runs air through the gun and past a "venturi" not unlike the one in your carb.

That venturi creates a suction along that sand pickup hose, but you can't just run it into a bucket of sand because you would not have enough vacuum to just pull a column of sand along that hose, so Rudi's got a "T" fitting in the bottom of the bucket.

Sand falls down into the "T" fitting, and is drawn along that sand pickup hose because there is air rushing through it, coming in from the makeup hose and being pulled along up to the gun by that vacuum created by the venturi effect, where it mixes with the high pressure air and is thrown out the business end of the gun and onto the part being tortured.
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Postby JBall8019 » Wed Feb 08, 2006 12:42 pm

hey Rudi,
the powerpoint presentations are great!!!!!! how about one on rerouting the oil guage to the dash?
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Postby Kirk » Wed Feb 08, 2006 1:18 pm

Ahhhh....Allen's explaination makes sense.

And Rudi, don't beat yourself up.....what you add to this forum is UNQAULIFIABLE :shock: :shock: The "T" fitting on the bottom pulls it all together for me now.

Mucho thanks
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Me too

Postby allenlook » Wed Feb 08, 2006 1:43 pm

Me too - knowing that it's a T fitting on the bottom, now I'll go and make me one. I couldn't for the life of me figure out where the make-up hose connected or how the gun pulled sand out of the bucket by itself.

Knowing it's a T fitting helps tremendously... Thanks Rudi!
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Sandblaster 90

Postby Charles (49) Mo » Wed Feb 08, 2006 1:59 pm

My cheap Sears unit has a tapered bucket with a 90 at the botton. A 1/4'' hole is drilled into the horizontal section on the 90 on the top. It lets air mix with the sand that falls into the 90.

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Postby DuxburyFarmall » Wed Feb 08, 2006 2:36 pm

Thanks Rudi for the information.

I believe that Allen you are mostly correct. I had thought that the Make up air would be from the T but wanted to make sure.

If I am not mistaken it is a vaccum that you are trying to avoid not create by adding the T.

If you create a vaccum then there will be no air movement and without air movement then the sand will not move. The make up T in this case would allow air to move from the far side from the gun past/through the sand (picking up and moving it as it goes) to the suction side passing through the gun.

If you do not have the T/Make up air then the sand will only move until a Vaccum is created.

I just wanted to check to make sure that I was thinking correctly. It has been a couple of years since I study physics when I went for my degree.

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Well it all sounds more complicated

Postby countershaft » Wed Feb 08, 2006 3:40 pm

than meets the eye. Now to put it into simple terms , you use a T fitting at the bottom of the tank ( plastic bucket) one side connects to the gun and the other side just sucks air (WITH OR WITHOUT A HOSE) attached.
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Postby Rudi » Wed Feb 08, 2006 6:26 pm

Bryson: BINGO :!: :!: :D

Allen: See, I knew somebody could explain it better than me... :!: :!: That is it in a nutshell. And exactly how I figured it out... the vacuum was broken, hence no media....

Chad: Now you know why I never got beyond college :idea: :arrow: :wink:

Kirk: Thanks I appreciate a lot, I really do, but I hate it when I do dumbass stuff like that.....
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Thanks

Postby countershaft » Wed Feb 08, 2006 9:28 pm

thanks Rudi ---------Mission accomplished
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