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Discussion Tool of the week!

Discussion in 'The Pub' started by ShaneP, Sep 20, 2018.

  1. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    Hmm I am going to need to make a couple to reassemble the SRX engine soon.
     
  2. ShaneP

    ShaneP Well-Known Member

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    I think tool of the week goes to:
    IMG_20181012_111358.jpg
    This guy! He's cheap normally, but this week he's even cheaper. So cheap that he tried to build a wet blaster rather than pay postage to send to @kiffsta. See?
    IMG_20181013_115220.jpg
    That was the second iteration, I had to upgrade the pump. Cost less than $15, and I found out that I had the parts and didn't need to buy them... :'( But did it work?
    IMG_20181013_112016.jpg
    Before ^
    IMG_20181013_115649.jpg
    After. Hmm, maybe I will try glass bead and see if it produces a more polished look. Also, I need a lid with glove, and air regulator. And a rain coat.
     
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  3. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Bead blast will give it a flat/dry finish, it's the wet blasting that give's it a shiner look.
    Might just need to lower the pressure or use finer grit/bead

    Your pump will be slowly getting ported out too, it'd be interesting to see how long the pump last's.
     
  4. kiffsta

    kiffsta Senior Member

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    My machine uses a gland pump ,
    I really admire your tenacity and ingenuity to build your own
     
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    Last edited: Oct 14, 2018
  5. ShaneP

    ShaneP Well-Known Member

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    I suspect it won't last long with beach sand. I originally used an electric pressure pump, but it lacked pressure and volume. I figured if I ruin a $250 pump every so often it wouldn't be as dear as buying a wet blaster. I doubt I'll use mine very often. Maybe I'll try a pool pump, sand blaster cabinet and glass bead, if I get this to work well enough. I might also need to adjust my air ratio to get a smoother finish, which means longer cleaning time.
     
  6. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    There is plenty of info out there on the interwebs about building your own Aqua-Blast cabinet... that pump will be OK for a while but it will chew out the mechanical seal before it wears away the volute or impeller. You should be able to get replacement mechanical seals for it as well.
    Industrial Wet blast machines have a Slurry pump on them and are generally a glandless pump so there is no mechanical seal to worry about etc. They also talk about a bypass line from the pump to keep the media mixed and in suspension. From the pics there doesnt seem to be any way of keeping the media in suspension so your blasting may not be as consistent as could be the case.. There is a good one that uses a big plastic drum on its side..
    https://hackaday.com/2015/04/26/diy-wet-media-blast-cabinet/
     
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  7. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Not a bad idea, but a swimming pool pump? Must be able to buy them cheap.
     
  8. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    This is one I made for forming the 'hump' on radiator pipes the stop hoses coming off.
    Tools 039.jpg
    Welded a ridge onto one side and cut out a groove on other. Hinged at back and flange to hold in vice. Pipe goes on to flange (depth gauge) and hit on top plate with hammer whilst turning pipe.
    Tools 033.jpg This is a piece of exhaust tube used for example.
    Tools 035.jpg
     
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  9. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    A shock spring compressor I made to change springs on my Maico (but have used on lots of others since). Bolt goes through top mount and the plates go between spring coils and top bolt is tightened to push spring down from collar.
    Tools 041.jpg
     
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  10. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    Plenty of cheap Pool pumps online.. ideally a little stainless steel irrigation pump would be best.. I think one of the articles mentioned 63 psi from the pump which is 430 kPa and that is pretty easy for the little SS ones. Pool pumps dont normally have high head (pressure) as flow is what is needed. Not too hard to tell that pumps are what I do on a daily basis is it..
    The real trick is to get the slurry where it isnt too heavy (too much media) and it stays in suspension.
    Beach sand isnt the best as it clumps when it is wet and isnt consistent in size.. glass beads would probably be better.
    For me.. I wouldnt make this as I wouldnt have enough parts to use it often enough.. easier to bead blast and if needed take it to someone else to finish it with Vapour Blast :)
     
  11. ShaneP

    ShaneP Well-Known Member

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    Well, the wet blaster worked a bit better Yesterday. Found that I didn't need the air line, but I did need more sand. To answer Andy, the powerful jet of water, high volume flow and quantity of sand means I was getting good suspension of media. But I had to fix the ratio a few times; not just water:sand ratio, but water and sand in the tub! I went through about 100L of water in an hour and 3kg of sand or so. Yes, the pump will be copping a hiding, but glass bead should be more mild. And a pool pump ($700+ for a powerful version) might be good, if you want electric drive. Motor pump will do for now, though. But I'd like a sandblasting cabinet to refit to wet blast, or make this one taller and more contained.
     
  12. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    The secret is to "not" have as much water and sand.. that is why the compressed air is used.. the air is what does the hard work. But.. I suspect that you would need a lot more air than most of us would have in our home workshops..
    Still if it works for you then that is all that matters... and no need to spend those $$ on a pool pump you are going to destroy. eBay has plenty of cheap Chinese units that will do just as good a job as the $700 units.
    They just dont last as long in a nice pool environment.
     
  13. ShaneP

    ShaneP Well-Known Member

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    I have a nozzle configuration that seems work, there is a powerful jet of water, and it somewhat aerates itself, especially when the water level gets low. ;-). I do have a 3-phase air compressor, so yes, it is more than most sheds. But it seems to work well enough, so I'll save running another system. You can get cheap pool pumps on eBay, but they tend to be small, ½-¾hp - I've got 4-6hp.
     
  14. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    No Pool pump will match the engine driven one you have now. That is a high flow transfer pump but be careful. Running the water level low will cause cavitation which will destroy the impeller and mechanical seal quite quickly. You will hear it as it will sound like it is pumping a bag of nails.
    The other thing to keep in mind is that the higher the pressure you get, the lower the flow will be ( that is how centrifugal pumps work) and the higher the pressure the less power the pump uses. Highest power is at max flow with no back pressure.
    The tag on the pump should give you max flow and max head ( pressure ).
    Sounds like it works for you though.

    If you get a blast cabinet it will rust out unless you coat it with something inside.
    Maybe one of those big plastic drums on its side would be better.


    Sent from my iPhone using Tapatalk Pro
     
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  15. ShaneP

    ShaneP Well-Known Member

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    What if I use kerosene instead of water? :-D Slightly more realistic: coolant additive, anticorrosion compound. Ethylene glycol might help degreasing, too.. Not really
     
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  16. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    I dont think I would be wanting to pump anything that is volatile.. and kerosene is exactly that.. and Ethylene Glycol is corrosive and not very nice to be playing with.. Probably easier to stick with water... and I bet you can find those big blue plastic tubs far cheaper than a 2nd hand blast cabinet...dont they have big tubs like that for Molasses up your way?
     
  17. ShaneP

    ShaneP Well-Known Member

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    I have plastic drums, but I still have to make a lid, so I'm back to the laundry tub. The cabinet would be sealed and drain into the bottom, hose in the cabinet, gloves.. Easy.
     
  18. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    Trust me... the blast cabinets are definitely NOT sealed...lol and you would rust it out.. even with the small amount of blasting I have done a large amount of the paint is gone from the inside of mine.... add water and wet sand... it wont last long...
     
  19. ShaneP

    ShaneP Well-Known Member

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    IMG_20181017_173938.jpg
    My auxiliary fuel tank for working on bikes. A brake fluid bottle with a hole drilled in the lid and a brake bolt that goes through a banjo bolt screwed into the hole.
     
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  20. kiffsta

    kiffsta Senior Member

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    I use one of these, works a treat as the top slides into various hose sizes

    tank.PNG tank.PNG
     
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